Anti-seepage scheme is the most critical problem in the design and construction of earth-rock dam project. It plays a decisive role in whether the whole reservoir dam can effectively retain water. The quality of its s...Anti-seepage scheme is the most critical problem in the design and construction of earth-rock dam project. It plays a decisive role in whether the whole reservoir dam can effectively retain water. The quality of its system will directly affect the success or failure of the whole project. Aiming at the problems such as low flood control standard of a reservoir's homogeneous dam, large-area swamping of downstream dam slope, local water and sand leakage of the dam body, according to the results of core drilling sampling and safety appraisal analysis, combined with the dam's disease risk status and dam type structure, the risk removal and reinforcement scheme combining 0.7m increase in dam crest thickness with backfilling clay of drift-grab casing wells is optimized.展开更多
Large goods transported in railway are kinds of special goods and they are very important in national construction. In order to transport safely, loading and reinforcing schemes must be made first. How to design a rea...Large goods transported in railway are kinds of special goods and they are very important in national construction. In order to transport safely, loading and reinforcing schemes must be made first. How to design a reasonable scheme will be affected by many factors. This paper presents the characteristic of the large goods, summarizes the process of designing a loading and reinforcing scheme of large good, then probes the factors of affecting the loading and reinforcing scheme and gives a detail analysis. It’s considered that those out-of-gauge and overweight degree of goods, center-of- gravity height of a loaded wagon, position of center-of-gravity of goods, type of wagon for using, reinforcement material and reinforcement method, transport expense and transport organization could affect a scheme in the aspects of safety, economy, rapidity and convenience. This conclusion will instruct and help to make a good scheme.展开更多
Ground movements due to tunneling are becoming increasingly critical as buildings are located around construction sites.This study proposes a new combined reinforcement method using a foundation grouting oblique pipe ...Ground movements due to tunneling are becoming increasingly critical as buildings are located around construction sites.This study proposes a new combined reinforcement method using a foundation grouting oblique pipe roof.The former improves the bearing capacity of the subsoil,and the latter blocks the transmission of soil deformation,which weakens the influence of construction during overlapped tunnel under-crossing.Based on this new method,a case study of the shield tunneling response to an old building in Line 6 of China’s Chengdu Metro is presented.Additionally,three-dimensional numerical models without reinforcement,traditional foundation grouting reinforcement,and the new combined reinforcement schemes were compared.The numerical simulation performance was verified using a set of field instrumentation data,which demonstrated that the old building response to the overlapped tunnels was under control,and the maximum deformation,angular distortion,and principal tensile strain of the building were 5.25 mm,5.1010–6 rad/m,and 0.0081%,respectively.Compared with the traditional reinforcement scheme,the deformation,angular distortion,and principal tensile strain in the combined reinforcement scheme were reduced by 54.78%,71.02%,and 70.22%,respectively.These results have important implications for the design and construction of shield tunnels and their response to old buildings.展开更多
文摘Anti-seepage scheme is the most critical problem in the design and construction of earth-rock dam project. It plays a decisive role in whether the whole reservoir dam can effectively retain water. The quality of its system will directly affect the success or failure of the whole project. Aiming at the problems such as low flood control standard of a reservoir's homogeneous dam, large-area swamping of downstream dam slope, local water and sand leakage of the dam body, according to the results of core drilling sampling and safety appraisal analysis, combined with the dam's disease risk status and dam type structure, the risk removal and reinforcement scheme combining 0.7m increase in dam crest thickness with backfilling clay of drift-grab casing wells is optimized.
文摘Large goods transported in railway are kinds of special goods and they are very important in national construction. In order to transport safely, loading and reinforcing schemes must be made first. How to design a reasonable scheme will be affected by many factors. This paper presents the characteristic of the large goods, summarizes the process of designing a loading and reinforcing scheme of large good, then probes the factors of affecting the loading and reinforcing scheme and gives a detail analysis. It’s considered that those out-of-gauge and overweight degree of goods, center-of- gravity height of a loaded wagon, position of center-of-gravity of goods, type of wagon for using, reinforcement material and reinforcement method, transport expense and transport organization could affect a scheme in the aspects of safety, economy, rapidity and convenience. This conclusion will instruct and help to make a good scheme.
基金funding provided by the National Natural Science Foundation of China(Grant No.51808469)the Basic Applied Research Projects of the Sichuan Science and Technology Department(Grant No.2022NSFSC0442).
文摘Ground movements due to tunneling are becoming increasingly critical as buildings are located around construction sites.This study proposes a new combined reinforcement method using a foundation grouting oblique pipe roof.The former improves the bearing capacity of the subsoil,and the latter blocks the transmission of soil deformation,which weakens the influence of construction during overlapped tunnel under-crossing.Based on this new method,a case study of the shield tunneling response to an old building in Line 6 of China’s Chengdu Metro is presented.Additionally,three-dimensional numerical models without reinforcement,traditional foundation grouting reinforcement,and the new combined reinforcement schemes were compared.The numerical simulation performance was verified using a set of field instrumentation data,which demonstrated that the old building response to the overlapped tunnels was under control,and the maximum deformation,angular distortion,and principal tensile strain of the building were 5.25 mm,5.1010–6 rad/m,and 0.0081%,respectively.Compared with the traditional reinforcement scheme,the deformation,angular distortion,and principal tensile strain in the combined reinforcement scheme were reduced by 54.78%,71.02%,and 70.22%,respectively.These results have important implications for the design and construction of shield tunnels and their response to old buildings.
