Engineering construction is carried out on the basis of geotechnical engineering investigation and foundation design. The results of geotechnical engineering investigation and foundation design determine whether the f...Engineering construction is carried out on the basis of geotechnical engineering investigation and foundation design. The results of geotechnical engineering investigation and foundation design determine whether the follow-up engineering construction can be carried out smoothly and whether the expected effect can be achieved to a large extent. As a complex and systematic work, geotechnical engineering investigation and foundation design inevitably have some problems, which need relevant personnel to explore effective solutions on the basis of clarifying the problems.展开更多
At present, the construction industry is developing faster and faster, and people pay more and more attention to the safety of construction engineering. At present, the foundation of high-rise buildings often adopts t...At present, the construction industry is developing faster and faster, and people pay more and more attention to the safety of construction engineering. At present, the foundation of high-rise buildings often adopts the form of pile foundation. Because its construction period is controllable, the construction technology is relatively mature. In the design process, the reasonable selection of pile foundation has a great impact on the whole project cost and construction period. At present, including real estate development companies and design institutes, they attach great importance to the rationality of pile foundation design. Based on this, the selection of suitable pile foundation type in building structure design plays a vital role in the construction of the whole project.展开更多
The structural design of housing architecture is the core part of housing architecture design, and the overall design effect is directly related to the safety and stability of the building, as well as the life and pro...The structural design of housing architecture is the core part of housing architecture design, and the overall design effect is directly related to the safety and stability of the building, as well as the life and property safety of users. With the rapid development of China's economy, users have a higher demand for the structural design of housing construction. The basic structural design is also a key part of the building architecture design. Therefore, we need to pay more attention to the building architecture design to ensure the rationality and scientificity of the overall design, so as to comprehensively improve the overall level of building architecture design.展开更多
At present, the construction industry is developing faster and faster, and people pay more and more attention to the safety of construction projects. At present, the foundation of high-rise buildings often adopts the ...At present, the construction industry is developing faster and faster, and people pay more and more attention to the safety of construction projects. At present, the foundation of high-rise buildings often adopts the form of pile foundation, because its construction period is controllable and the construction technology is relatively mature. In the design process, the reasonable selection of pile foundation has a great impact on the whole project cost and construction period. At present, including real estate development companies and design institutes, they attach great importance to the rationality of pile foundation design. Based on this, the selection of suitable pile foundation type in building structure design plays a vital role in the construction of the whole project.展开更多
With the continuous improvement of technical level, the geotechnical investigation work is more efficient in the construction stage of the project, which can lay a good foundation for the smooth development of the pro...With the continuous improvement of technical level, the geotechnical investigation work is more efficient in the construction stage of the project, which can lay a good foundation for the smooth development of the project. The foundation design is also an important way to improve the engineering quality. Geotechnical investigation and foundation design, as key engineering links, directly affect the final results and quality of engineering construction. Therefore, in order to improve the safety and stability of the project, geotechnical engineering investigation and foundation design should be studied before the project is launched, and scientific and effective methods should be adopted to improve the quality of work.展开更多
This article analyzes creation methods of automated design system, presents design system of a house foundation from blocks. The creation methods of automated design system of a house foundation from blocks are discov...This article analyzes creation methods of automated design system, presents design system of a house foundation from blocks. The creation methods of automated design system of a house foundation from blocks are discovered with Unified Modeling Language. Analyzed objects-classes： block, specification, model. Graphical system can design foundation, form specification of objects and create 3D model of house foundation. There are several types and different dimensions of concrete blocks. The program optimally arranges selected blocks so that monolithic parts will be minimal volume. Program selects a house foundation blocks from database by using ActiveX Data Objects technology, which by programming method connects drawing and database. Drawing＇s graphical objects have additional data from which exchange of data between graphical system and database is executed. Visualization system and example of house foundation from blocks project with specifications is presented. Creation problems of automated design system are discussed and conclusions are made.展开更多
In highway engineering, road and bridge are very important components, which can not only provide convenience for people to travel, but also promote the rapid and stable development of regional economy to a large exte...In highway engineering, road and bridge are very important components, which can not only provide convenience for people to travel, but also promote the rapid and stable development of regional economy to a large extent. Under the current technical conditions, the construction of road and bridge foundation is mostly in the form of pile foundation, and the construction quality of pile foundation is directly related to the stability and safety of bridge engineering. Based on this, the paper discusses the design points of bridge pile foundation.展开更多
The Federal Highway Administration (FHWA) sponsored a large,multi-year project conducted by the Multidisciplinary Center for Earthquake Engineering Research (MCEER) titled'Seismic Vulnerability of New Highway Cons...The Federal Highway Administration (FHWA) sponsored a large,multi-year project conducted by the Multidisciplinary Center for Earthquake Engineering Research (MCEER) titled'Seismic Vulnerability of New Highway Construction'(MCEER Project 112),which was completed in 1998.MCEER coordinated the work of many researchers,who performed studies on the seismic design and vulnerability analysis of highway bridges,tunnels,and retaining structures. Extensive research was conducted to provide revisions and improvements to current design and detailing approaches and national design specifications for highway bridges.The program included both analytical and experimental studies,and addressed seismic hazard exposure and ground motion input for the U.S.highway system;foundation design and soil behavior: structural importance,analysis,and response:structural design issues and details;and structural design criteria.展开更多
Foundation is considered as one of the main parts of any structure. The type of foundation used is highly dependent on the type and properties of soil. The design of foundations requires many factors that should be de...Foundation is considered as one of the main parts of any structure. The type of foundation used is highly dependent on the type and properties of soil. The design of foundations requires many factors that should be defined. There are number of differences in the geological and soil conditions in Iraq. As a consequence, these differences are reflected on the type of foundation to be used. Despite these differences, same materials and style of buildings are used all over Iraq. The main problems of Iraqi soil are high gypsum content, salinity and shallow water table depth. These factors that influence the foundations are the soil properties and the amount of loads that transmitted by the superstructure. The situation has been analysed through a case study which illustrated the link between soil and foundation types in three different parts of Iraq （Mosul, Baghdad and Basra）. One building was analysed using ＂STAAD （structural analysis and design）. Pro＂ software in these regions. It is evident that Iraqi designers and engineers require local code to define all the loads, materials and design of the foundation to be used. The use of local materials might be very effective from both engineering and economic perspectives.展开更多
The specialized equipment utilized in long-line tunnel engineering is evolving towards large-scale,multifunctional,and complex orientations.The vibration caused by the high-frequency units during regular operation is ...The specialized equipment utilized in long-line tunnel engineering is evolving towards large-scale,multifunctional,and complex orientations.The vibration caused by the high-frequency units during regular operation is supported by the foundation of the units,and the magnitude of vibration and the operating frequency fluctuate in different engineering contexts,leading to variations in the dynamic response of the foundation.The high-frequency units yield significantly diverse outcomes under different startup conditions and times,resulting in failure to meet operational requirements,influencing the normal function of the tunnel,and causing harm to the foundation structure,personnel,and property in severe cases.This article formulates a finite element numerical computation model for solid elements using three-dimensional elastic body theory and integrates field measurements to substantiate and ascertain the crucial parameter configurations of the finite element model.By proposing a comprehensive startup timing function for high-frequency dynamic machines under different startup conditions,simulating the frequency andmagnitude variations during the startup process,and suggesting functions for changes in frequency and magnitude,a simulated startup schedule function for high-frequency machines is created through coupling.Taking into account the selection of the transient dynamic analysis step length,the dynamic response results for the lower dynamic foundation during its fundamental frequency crossing process are obtained.The validation checks if the structural magnitude surpasses the safety threshold during the critical phase of unit startup traversing the structural resonance region.The design recommendations for high-frequency units’dynamic foundations are provided,taking into account the startup process of the machine and ensuring the safe operation of the tunnel.展开更多
The Millau viaduct over the Tam River is an exceptional bridge considering the height under the deck and the 2.5 km total length. Each of the seven high piers is founded on a thick raft setting on four large piles of ...The Millau viaduct over the Tam River is an exceptional bridge considering the height under the deck and the 2.5 km total length. Each of the seven high piers is founded on a thick raft setting on four large piles of 5 m in diameter and 10-15 m deep. The ground schematically consists of limestone in the north and of marls in the south. As the bridge is very sensitive to foundation settlements, the concessionary company decided to use the observational method for controlling the displacements and if necessary stabilize the foundations. The measurements show that the movements have remained small and admissible, particularly in terms of the rotations. The settlements have not occurred continuously under the load, but by steps.展开更多
Based upon characteristic movement features of the overlying strata in solid backfill mining and in-situ observations,an associated model representing a roadway support system has been developed.Based on the Winkler f...Based upon characteristic movement features of the overlying strata in solid backfill mining and in-situ observations,an associated model representing a roadway support system has been developed.Based on the Winkler foundation and beam model,the current study presents a static analysis of the model,thus permitting acquisition of a theoretical formula pertaining to roof convergence.Through use of working face 6304-1(Jisan Colliery) as the research setting,the association between roof convergence magnitude and both packwall strength and width have been elucidated.Based upon observed conditions at the working face,realistic packwall parameters have been formulated,with numerical simulation results and field application results indicating that design parameters garnered from the developed formula successfully adapted to local geological movement and deformation.Accordingly,roadway deformation was shown to be within the permissible range,thus satisfying mine production requirements.The proposed method in the current study may give a design basis for pack design in the context of SBM under similar conditions.展开更多
Laterally loaded piles,which are commonly used in sandy stratum foundations,are particularly susceptible to necking defects during cast-in-place installation due to borehole collapse risks.These construction-induced g...Laterally loaded piles,which are commonly used in sandy stratum foundations,are particularly susceptible to necking defects during cast-in-place installation due to borehole collapse risks.These construction-induced geometric imperfections substantially compromise pile safety under lateral loading conditions.To address this critical design challenge,we develop a reliability-based multi-objective optimization framework that simultaneously accounts for structural safety,construction economy,and design robustness.The proposed methodology integrates the p-y curve(where p is the soil pressure per unit length,and y is the lateral deflection of the pile)analysis with stochastic modeling,enabling efficient evaluation of pile performance considering uncertainties in soil parameters and depth and size variations of necking defects.A systematic design framework is implemented and validated through experimental case studies,successfully generating optimal designs along the Pareto front.The identified knee-point configurations serve as practical compromise solutions for engineering decisions.Parametric investigations further elucidate the influence of necking defect depth and sand friction angle variations on optimal design outcomes,offering insights into risk mitigation for pile construction.展开更多
Mongolia is a land-locked country in Central Asia, located between Russia and China. The country＇s high altitude results in cold, dry, and harsh climatic conditions with permafrost being widespread through the territ...Mongolia is a land-locked country in Central Asia, located between Russia and China. The country＇s high altitude results in cold, dry, and harsh climatic conditions with permafrost being widespread through the territory. Although the capital city Ulaanbaatar is situated in an area with discontinuous permafrost, the downtown section has recently seen a disappearance of permafrost due to an underground central heating system. During the last decade, expansion of the suburbs toward the Nalaikh Depression has resulted in construction of a new residential complex （Urgakh Naran）, construction materials trading center, cement factory and agricultural products market. In the next 10 years, projects such as a university campus, logistics center, residential complex, railway and highway extensions connecting Russia and China have been planned. Engineering-geological and geotechnical investigations have been conducted for these construction projects. This paper presents some of the results determining the engineering geocryological conditions of Nalaikh district and offers foundation design options.展开更多
文摘Engineering construction is carried out on the basis of geotechnical engineering investigation and foundation design. The results of geotechnical engineering investigation and foundation design determine whether the follow-up engineering construction can be carried out smoothly and whether the expected effect can be achieved to a large extent. As a complex and systematic work, geotechnical engineering investigation and foundation design inevitably have some problems, which need relevant personnel to explore effective solutions on the basis of clarifying the problems.
文摘At present, the construction industry is developing faster and faster, and people pay more and more attention to the safety of construction engineering. At present, the foundation of high-rise buildings often adopts the form of pile foundation. Because its construction period is controllable, the construction technology is relatively mature. In the design process, the reasonable selection of pile foundation has a great impact on the whole project cost and construction period. At present, including real estate development companies and design institutes, they attach great importance to the rationality of pile foundation design. Based on this, the selection of suitable pile foundation type in building structure design plays a vital role in the construction of the whole project.
文摘The structural design of housing architecture is the core part of housing architecture design, and the overall design effect is directly related to the safety and stability of the building, as well as the life and property safety of users. With the rapid development of China's economy, users have a higher demand for the structural design of housing construction. The basic structural design is also a key part of the building architecture design. Therefore, we need to pay more attention to the building architecture design to ensure the rationality and scientificity of the overall design, so as to comprehensively improve the overall level of building architecture design.
文摘At present, the construction industry is developing faster and faster, and people pay more and more attention to the safety of construction projects. At present, the foundation of high-rise buildings often adopts the form of pile foundation, because its construction period is controllable and the construction technology is relatively mature. In the design process, the reasonable selection of pile foundation has a great impact on the whole project cost and construction period. At present, including real estate development companies and design institutes, they attach great importance to the rationality of pile foundation design. Based on this, the selection of suitable pile foundation type in building structure design plays a vital role in the construction of the whole project.
文摘With the continuous improvement of technical level, the geotechnical investigation work is more efficient in the construction stage of the project, which can lay a good foundation for the smooth development of the project. The foundation design is also an important way to improve the engineering quality. Geotechnical investigation and foundation design, as key engineering links, directly affect the final results and quality of engineering construction. Therefore, in order to improve the safety and stability of the project, geotechnical engineering investigation and foundation design should be studied before the project is launched, and scientific and effective methods should be adopted to improve the quality of work.
文摘This article analyzes creation methods of automated design system, presents design system of a house foundation from blocks. The creation methods of automated design system of a house foundation from blocks are discovered with Unified Modeling Language. Analyzed objects-classes： block, specification, model. Graphical system can design foundation, form specification of objects and create 3D model of house foundation. There are several types and different dimensions of concrete blocks. The program optimally arranges selected blocks so that monolithic parts will be minimal volume. Program selects a house foundation blocks from database by using ActiveX Data Objects technology, which by programming method connects drawing and database. Drawing＇s graphical objects have additional data from which exchange of data between graphical system and database is executed. Visualization system and example of house foundation from blocks project with specifications is presented. Creation problems of automated design system are discussed and conclusions are made.
文摘In highway engineering, road and bridge are very important components, which can not only provide convenience for people to travel, but also promote the rapid and stable development of regional economy to a large extent. Under the current technical conditions, the construction of road and bridge foundation is mostly in the form of pile foundation, and the construction quality of pile foundation is directly related to the stability and safety of bridge engineering. Based on this, the paper discusses the design points of bridge pile foundation.
基金the Federal Highway Administration under contract number DTFH61-92-C-00112.
文摘The Federal Highway Administration (FHWA) sponsored a large,multi-year project conducted by the Multidisciplinary Center for Earthquake Engineering Research (MCEER) titled'Seismic Vulnerability of New Highway Construction'(MCEER Project 112),which was completed in 1998.MCEER coordinated the work of many researchers,who performed studies on the seismic design and vulnerability analysis of highway bridges,tunnels,and retaining structures. Extensive research was conducted to provide revisions and improvements to current design and detailing approaches and national design specifications for highway bridges.The program included both analytical and experimental studies,and addressed seismic hazard exposure and ground motion input for the U.S.highway system;foundation design and soil behavior: structural importance,analysis,and response:structural design issues and details;and structural design criteria.
文摘Foundation is considered as one of the main parts of any structure. The type of foundation used is highly dependent on the type and properties of soil. The design of foundations requires many factors that should be defined. There are number of differences in the geological and soil conditions in Iraq. As a consequence, these differences are reflected on the type of foundation to be used. Despite these differences, same materials and style of buildings are used all over Iraq. The main problems of Iraqi soil are high gypsum content, salinity and shallow water table depth. These factors that influence the foundations are the soil properties and the amount of loads that transmitted by the superstructure. The situation has been analysed through a case study which illustrated the link between soil and foundation types in three different parts of Iraq （Mosul, Baghdad and Basra）. One building was analysed using ＂STAAD （structural analysis and design）. Pro＂ software in these regions. It is evident that Iraqi designers and engineers require local code to define all the loads, materials and design of the foundation to be used. The use of local materials might be very effective from both engineering and economic perspectives.
基金Smart Integration Key Technologies and Application Demonstrations of Large Scale Underground Space Disaster Prevention and Reduction in Guangzhou International Financial City([2021]–KJ058).
文摘The specialized equipment utilized in long-line tunnel engineering is evolving towards large-scale,multifunctional,and complex orientations.The vibration caused by the high-frequency units during regular operation is supported by the foundation of the units,and the magnitude of vibration and the operating frequency fluctuate in different engineering contexts,leading to variations in the dynamic response of the foundation.The high-frequency units yield significantly diverse outcomes under different startup conditions and times,resulting in failure to meet operational requirements,influencing the normal function of the tunnel,and causing harm to the foundation structure,personnel,and property in severe cases.This article formulates a finite element numerical computation model for solid elements using three-dimensional elastic body theory and integrates field measurements to substantiate and ascertain the crucial parameter configurations of the finite element model.By proposing a comprehensive startup timing function for high-frequency dynamic machines under different startup conditions,simulating the frequency andmagnitude variations during the startup process,and suggesting functions for changes in frequency and magnitude,a simulated startup schedule function for high-frequency machines is created through coupling.Taking into account the selection of the transient dynamic analysis step length,the dynamic response results for the lower dynamic foundation during its fundamental frequency crossing process are obtained.The validation checks if the structural magnitude surpasses the safety threshold during the critical phase of unit startup traversing the structural resonance region.The design recommendations for high-frequency units’dynamic foundations are provided,taking into account the startup process of the machine and ensuring the safe operation of the tunnel.
文摘The Millau viaduct over the Tam River is an exceptional bridge considering the height under the deck and the 2.5 km total length. Each of the seven high piers is founded on a thick raft setting on four large piles of 5 m in diameter and 10-15 m deep. The ground schematically consists of limestone in the north and of marls in the south. As the bridge is very sensitive to foundation settlements, the concessionary company decided to use the observational method for controlling the displacements and if necessary stabilize the foundations. The measurements show that the movements have remained small and admissible, particularly in terms of the rotations. The settlements have not occurred continuously under the load, but by steps.
基金financial support from the Fundamental Research Funds for the Central Universities(China University of Mining and Technology)under Grant 2014ZDPY02Qing Lan Project
文摘Based upon characteristic movement features of the overlying strata in solid backfill mining and in-situ observations,an associated model representing a roadway support system has been developed.Based on the Winkler foundation and beam model,the current study presents a static analysis of the model,thus permitting acquisition of a theoretical formula pertaining to roof convergence.Through use of working face 6304-1(Jisan Colliery) as the research setting,the association between roof convergence magnitude and both packwall strength and width have been elucidated.Based upon observed conditions at the working face,realistic packwall parameters have been formulated,with numerical simulation results and field application results indicating that design parameters garnered from the developed formula successfully adapted to local geological movement and deformation.Accordingly,roadway deformation was shown to be within the permissible range,thus satisfying mine production requirements.The proposed method in the current study may give a design basis for pack design in the context of SBM under similar conditions.
基金supported by the Fundamental Research Funds for the Central Universities of China(No.226-2024-00197)the National Natural Science Foundation of China(No.42277129)+1 种基金the Key R&D Project of Zhejiang Province(No.2021C03159)the Natural Science Foundation of Zhejiang Province(No.LR24E080004),China.
文摘Laterally loaded piles,which are commonly used in sandy stratum foundations,are particularly susceptible to necking defects during cast-in-place installation due to borehole collapse risks.These construction-induced geometric imperfections substantially compromise pile safety under lateral loading conditions.To address this critical design challenge,we develop a reliability-based multi-objective optimization framework that simultaneously accounts for structural safety,construction economy,and design robustness.The proposed methodology integrates the p-y curve(where p is the soil pressure per unit length,and y is the lateral deflection of the pile)analysis with stochastic modeling,enabling efficient evaluation of pile performance considering uncertainties in soil parameters and depth and size variations of necking defects.A systematic design framework is implemented and validated through experimental case studies,successfully generating optimal designs along the Pareto front.The identified knee-point configurations serve as practical compromise solutions for engineering decisions.Parametric investigations further elucidate the influence of necking defect depth and sand friction angle variations on optimal design outcomes,offering insights into risk mitigation for pile construction.
文摘Mongolia is a land-locked country in Central Asia, located between Russia and China. The country＇s high altitude results in cold, dry, and harsh climatic conditions with permafrost being widespread through the territory. Although the capital city Ulaanbaatar is situated in an area with discontinuous permafrost, the downtown section has recently seen a disappearance of permafrost due to an underground central heating system. During the last decade, expansion of the suburbs toward the Nalaikh Depression has resulted in construction of a new residential complex （Urgakh Naran）, construction materials trading center, cement factory and agricultural products market. In the next 10 years, projects such as a university campus, logistics center, residential complex, railway and highway extensions connecting Russia and China have been planned. Engineering-geological and geotechnical investigations have been conducted for these construction projects. This paper presents some of the results determining the engineering geocryological conditions of Nalaikh district and offers foundation design options.
