Numerical Simulation And Optimization Analysis Of Prestressed Anchor Cable Composite Soil Nail Wall

Composite soil nailing support technology is in last few years developed on the basis of soil nailing and used for foundation pit supporting or improving the stability of the slope new support method, in our country high-rise buildings, underground civil air defence, tunnel, slope reinforcement projects widely used. At present, the soil nailing support to the study of the theory of the structure is relatively backward, not much experimental study, design methods are not perfect, limit the soil nailing support’s development of new technology. This paper from the soil nailing support to stress mechanism, by using the finite element analysis of composite soil nailing support structure studied deeply, and with the actual engineering monitoring results contrast, summarizes composite soil nailing support structural internal force and deformation change rule, propose optimization composite soil nailing support structure design method, provide reference for the engineering practice experience.The main contents include:Firstly discuss the soil nailing support technology and its characteristics, development situation and application prospect of soil nailing supporting technology at home and abroad and the development situation and research are reviewed, and points out that the soil nailing support’s the problems existed in the research, aiming at these problems, this paper puts forward the main research contents, briefly introduces the composite soil nailing support the research and application of technology.Secondly, on the basis of previous studies of soil nail out from the load transfer mechanism, friction reinforcement mechanism, apparent cohesion theory and force of prestressed anchor on mechanism of composite soil nailing support of prestressed anchor structure of the working mechanism and the working performance is studied systematically, and then introduces the finite element numerical analysis research ideas and soil constitutive model, discusses the soil nail, anchor cable and the surface and their finite element model.Then in some engineering composite soil nailing wall structure as the background, established the finite element calculation model and combined with the engineering measured data and calculated results further comparative study, revealed composite soil nailing support structure in the process of foundation pit excavation supporting internal force and deformation change rule, fully showed the finite element model built is reasonable. The next built in finite element model of the foundation, the support parameters such as the anchor and soil nailing and the surface were systematically studied and by means of the numerical simulation analysis, and mainly discussed the influence of composite soil nailing support structure on the performance of the work about the anchor cable length, set position, prestress, soil nail spacing, soil nail angle and surface, explored the mechanism of interaction between soil nailing support structure and internal force and deformation of the change rule, for engineering design puts forward optimum, for similar projects.Finally, the author summarized the whole paper, indicated the main research results and pointed out the shortcomings and further studies of the contents, and summing up the composite soil nailing technology research on the basis of the full text of the prospect.