The Internal Force And Deformation Analysis Of Combined Supporting Structure Of Pile-strut Bracing-anchor

In recent years, with the vigorous development of construction in China, more and more high-rise buildings and underground rail traffic concentrated in urban center area, and the resulting the deep excavation engineering are appear continuously. Due to the dense city center building, the narrow site, construction environment is extremely complex, thus increasing the difficulty of foundation pit supporting, and also more strictly with the safety of foundation pit supporting. Pile-anchor supporting system and interior bracing supporting system is started application and development of supporting and retaining structure in the early years of foundation pit engineering. At present, domestic and foreign scholars through the theoretical calculation and numerical analysis method of the retaining structure with pile-anchor and struts, mechanical characteristics and the mechanism and so on have made the corresponding research. But the bearing and deforming behavior and influencing factors of related research for combined support system of "pile-bracing-anchor" is still inadequate.Papers in the predecessors of the retaining structure with pile-anchor and struts based on the study, through data collection, arrangement, research and analysis, the internal force and deformation of combined support system of "pile-bracing-anchor" were studied. In the past based on the calculation methods of foundation pit, the numerical method of the internal force and deformation of the combined support structure has carried on the theoretical research. Combined with the corresponding engineering example, through the simulation analysis of finite element software for the excavating and supporting process, the internal force and displacement curve of the supporting structure is obtained, and the factors affect the sensitivity of the supporting structure internal force and displacement are analyzed. To "pile-bracing-anchor" combined support technology application in the engineering practice provides a useful reference. This article main research content is as follows:(1) Based on the understanding of foundation pit supporting forms the research status at home and abroad, introduced the research situation, the calculation theory and the analysis method of the retaining structure with pile-anchor and struts, and the advantages and disadvantages of retaining structure are comparative analysis.(2) In past research, on the basis of the theory of foundation pit supporting structure summarise the advantages and disadvantages of "pile-bracing-anchor" combination supporting structure, etc. Through the analysis of research "pile-bracing-anchor" combined support structure internal force calculation formula.(3) Some buildings in Lanzhou area deep foundation pit engineering, on the basis of the investigation report with the help of finite element analysis software MIDAS/GTS,"pile-bracing-anchor" combination supporting structure in foundation pit excavation supporting internal force and deformation in the process of numerical simulation analysis.(4) Under different design parameters was studied by simulated internal force and displacement change of "pile-bracing-anchor" combination, and the simulation results were analyzed.