With the continuous acceleration of coal mine production speed, the workload of mine roadway drivage is also constantly improving. How to better realize rapid drivage has become the key problem facing the current coal...With the continuous acceleration of coal mine production speed, the workload of mine roadway drivage is also constantly improving. How to better realize rapid drivage has become the key problem facing the current coal mine production. Because the supporting efficiency of coal mine rapid excavation can not meet the corresponding requirements, it should be studied in this aspect to solve the problem of low coal mine production efficiency and better improve the economic benefits of coal mine enterprises.展开更多
The further development of society depends on the support of energy. Based on China's economic construction system, the importance of coal mines can not be ignored. With the increasing demand for coal, the demand ...The further development of society depends on the support of energy. Based on China's economic construction system, the importance of coal mines can not be ignored. With the increasing demand for coal, the demand for mining is also increasing. Therefore, it is necessary to maintain the safety and stability of coal mining with the help of tunneling support technology, and complete the core goal of coal mining under complex geological conditions. Based on this, this paper explores the efficient coal mine excavation support technology in complex terrain, hoping to provide some feasible reference opinions for the majority of colleagues.展开更多
The primary goal of this study is to provide an efficient numerical tool to analyze the seismic performance of nailed walls.Modeling such excavation supports involves complexities due partly to the interaction of supp...The primary goal of this study is to provide an efficient numerical tool to analyze the seismic performance of nailed walls.Modeling such excavation supports involves complexities due partly to the interaction of support with soil and partly because of the amplification of seismic waves through an excavation wall.Consequently,innovative modeling is suggested herein,incorporating the calibration of the soil constitutive model in a targeted range of stress and strain,and the detection of a natural period of complex systems,including soil and structure,while benefiting from Rayleigh damping to filter unwanted noises.The numerical model was achieved by simulating a previous centrifuge test of the excavation wall,manifested at the pre-failure state.Notably,the calibration of the soil constitutive model through empirical relations,which replaces the numerical reproduction of an element test,more accurately simulated the soil-nail-wall interaction.Two factors were crucial to a successful result.First,probing the natural period of the complicated geometry of the model by applying white noises.Second,considering Rayleigh damping to withdraw unwanted noises and thus assess their permanent effects on the model.Rayleigh damping was applied instead of filtering the obtained results.展开更多
Coal production has certain particularity and is also a high-risk industry. Therefore, during coal mine excavation, we must do a good job in support operation, mainly using reasonable methods to ensure the safety and ...Coal production has certain particularity and is also a high-risk industry. Therefore, during coal mine excavation, we must do a good job in support operation, mainly using reasonable methods to ensure the safety and stability of coal mine excavation and realize efficient production. However, in the coal mine excavation and support, it is necessary to confirm the common problems and solve them pertinently, so as to ensure the effect of coal mine excavation and support, avoid safety accidents and improve production efficiency.展开更多
Hydropower projects are an important part of our infrastructure construction process. In the process of achieving concrete results, we must continue to keep pace with the times, combine with the actual situation, and ...Hydropower projects are an important part of our infrastructure construction process. In the process of achieving concrete results, we must continue to keep pace with the times, combine with the actual situation, and make more effective use of new construction technology. Of all the construction technology, the application effect of excavation and foundation treatment technology is very important, can effectively solve the complicated construction problems in hydropower project construction, effectively shorten the construction period, improve the quality of d on this basis, this paper emphatically introduces the supporting technology of the main methods of slope excavation and its concrete application in hydropower project construction.展开更多
In this paper is presented a concept solution and acceptance test application procedure of deep pit protection structure,intended for three underground levels of residential building:A,B,C,D,block 10C,Budva,Montenegro...In this paper is presented a concept solution and acceptance test application procedure of deep pit protection structure,intended for three underground levels of residential building:A,B,C,D,block 10C,Budva,Montenegro.The anchored wall used consist of nongravity cantilevered walls with three levels of ground anchors.Nongravity cantilevered walls employ continuous walls constructed in slurry trenches(i.e.,slurry(diaphragm)walls),e.g vertical elements that are drilled to depths below the finished excavation grade.For those nongravity cantilevered walls,support is provided through the shear and bending stiffness of the vertical wall elements and passive resistance from the soil below the finished excavation grade.Anchored wall support relies on these components as well as lateral resistance provided by the ground anchors to resist horizontal pressures(e.g.,earth,water,external loads)acting on the wall.Anchored wall analysed and applied is temporary supporting structure necessary for the excavation and erection of the underground structure part up to ground surface level.Temporary ground anchors lifetime is up to two years.Dynamic loads are not considered.展开更多
The complicated rock structures and the stability of surrounding rocks of the underground powerhouse were the key rock mechanical problems in Shuibuya hydropower station.In order to overcome the related rock mechanica...The complicated rock structures and the stability of surrounding rocks of the underground powerhouse were the key rock mechanical problems in Shuibuya hydropower station.In order to overcome the related rock mechanical problems encountered during its construction,a comprehensive research was carried out for the underground powerhouse in Shuibuya hydropower station based on a detailed geological survey.It covers the investigations on the initial in-situ stress distribution features,rock mechanical properties,engineering rock mass classifications by different methods,numerical modeling for stability and support analysis,proper measures for rock excavation and support.The results show that the rock excavations of the underground powerhouse under the given geological conditions can be controlled effectively.Some measures,suggested by the designers,are proved to be rational and effective.These measures mainly consist of:(1)the soft rock replacements by concrete in local area below the crane beam,(2)the shotcrete and reinforcement by rock bolts and anchor cables in surrounding rocks,and(3)2 m concrete placement on the rock bench between adjacent tailrace tubes.The engineering practice shows that the treated surrounding rocks have a good overall stability.The deformation behaviors observed by safety equipments are within the designing limits.The research conclusions on the related rock mechanical problems,prior to the underground powerhouse excavations,are reliable.展开更多
文摘With the continuous acceleration of coal mine production speed, the workload of mine roadway drivage is also constantly improving. How to better realize rapid drivage has become the key problem facing the current coal mine production. Because the supporting efficiency of coal mine rapid excavation can not meet the corresponding requirements, it should be studied in this aspect to solve the problem of low coal mine production efficiency and better improve the economic benefits of coal mine enterprises.
文摘The further development of society depends on the support of energy. Based on China's economic construction system, the importance of coal mines can not be ignored. With the increasing demand for coal, the demand for mining is also increasing. Therefore, it is necessary to maintain the safety and stability of coal mining with the help of tunneling support technology, and complete the core goal of coal mining under complex geological conditions. Based on this, this paper explores the efficient coal mine excavation support technology in complex terrain, hoping to provide some feasible reference opinions for the majority of colleagues.
基金supported by the International Institute of Earthquake Engineering and Seismology(IIEES) as technical project No.760
文摘The primary goal of this study is to provide an efficient numerical tool to analyze the seismic performance of nailed walls.Modeling such excavation supports involves complexities due partly to the interaction of support with soil and partly because of the amplification of seismic waves through an excavation wall.Consequently,innovative modeling is suggested herein,incorporating the calibration of the soil constitutive model in a targeted range of stress and strain,and the detection of a natural period of complex systems,including soil and structure,while benefiting from Rayleigh damping to filter unwanted noises.The numerical model was achieved by simulating a previous centrifuge test of the excavation wall,manifested at the pre-failure state.Notably,the calibration of the soil constitutive model through empirical relations,which replaces the numerical reproduction of an element test,more accurately simulated the soil-nail-wall interaction.Two factors were crucial to a successful result.First,probing the natural period of the complicated geometry of the model by applying white noises.Second,considering Rayleigh damping to withdraw unwanted noises and thus assess their permanent effects on the model.Rayleigh damping was applied instead of filtering the obtained results.
文摘Coal production has certain particularity and is also a high-risk industry. Therefore, during coal mine excavation, we must do a good job in support operation, mainly using reasonable methods to ensure the safety and stability of coal mine excavation and realize efficient production. However, in the coal mine excavation and support, it is necessary to confirm the common problems and solve them pertinently, so as to ensure the effect of coal mine excavation and support, avoid safety accidents and improve production efficiency.
文摘Hydropower projects are an important part of our infrastructure construction process. In the process of achieving concrete results, we must continue to keep pace with the times, combine with the actual situation, and make more effective use of new construction technology. Of all the construction technology, the application effect of excavation and foundation treatment technology is very important, can effectively solve the complicated construction problems in hydropower project construction, effectively shorten the construction period, improve the quality of d on this basis, this paper emphatically introduces the supporting technology of the main methods of slope excavation and its concrete application in hydropower project construction.
文摘In this paper is presented a concept solution and acceptance test application procedure of deep pit protection structure,intended for three underground levels of residential building:A,B,C,D,block 10C,Budva,Montenegro.The anchored wall used consist of nongravity cantilevered walls with three levels of ground anchors.Nongravity cantilevered walls employ continuous walls constructed in slurry trenches(i.e.,slurry(diaphragm)walls),e.g vertical elements that are drilled to depths below the finished excavation grade.For those nongravity cantilevered walls,support is provided through the shear and bending stiffness of the vertical wall elements and passive resistance from the soil below the finished excavation grade.Anchored wall support relies on these components as well as lateral resistance provided by the ground anchors to resist horizontal pressures(e.g.,earth,water,external loads)acting on the wall.Anchored wall analysed and applied is temporary supporting structure necessary for the excavation and erection of the underground structure part up to ground surface level.Temporary ground anchors lifetime is up to two years.Dynamic loads are not considered.
基金Supported by the National Key Technology R&D Program of China(2008BAB29B01)
文摘The complicated rock structures and the stability of surrounding rocks of the underground powerhouse were the key rock mechanical problems in Shuibuya hydropower station.In order to overcome the related rock mechanical problems encountered during its construction,a comprehensive research was carried out for the underground powerhouse in Shuibuya hydropower station based on a detailed geological survey.It covers the investigations on the initial in-situ stress distribution features,rock mechanical properties,engineering rock mass classifications by different methods,numerical modeling for stability and support analysis,proper measures for rock excavation and support.The results show that the rock excavations of the underground powerhouse under the given geological conditions can be controlled effectively.Some measures,suggested by the designers,are proved to be rational and effective.These measures mainly consist of:(1)the soft rock replacements by concrete in local area below the crane beam,(2)the shotcrete and reinforcement by rock bolts and anchor cables in surrounding rocks,and(3)2 m concrete placement on the rock bench between adjacent tailrace tubes.The engineering practice shows that the treated surrounding rocks have a good overall stability.The deformation behaviors observed by safety equipments are within the designing limits.The research conclusions on the related rock mechanical problems,prior to the underground powerhouse excavations,are reliable.
