Study Of Global Stability Of Deep Foundation Ditch Supported By Pile-anchor

In a number of supporting structure of foundation pit,pile-anchor structure with its high safety,convenient construction,and small space,takes the first place.but the theory and Application Research on the overall stability of deep excavation is still not perfect.To solve this problem,based on the previous research on the pile,anchor effect on the overall stability of foundation pit,and analysis the Influence of cement-soil pile waterproof curtain on the overall stability of foundation pit.The main work of this paper is as follows:(1)Summed up four kinds of failure modes of deep foundation pit supported by pile-anchor structure access to information,sketched Sweden slice method,simplified Bishop method and shear strength reduction method,compared the advantages and disadvantages of the three methods,analyzed failure criterion of soil in shear strength reduction method;introduced briefly the calculation process of finite element method.(2)Combined ABAQUS and engineering project to simulate the excavation process of deep foundation pit supported by pile-anchor structure,compared simulation results with measuring results to verify the correctness of the model in paper.Simulated unsupported,piles in row supported,and pile-anchor supported foundation pit,respectively,compared the difference between the three,and obtained the influence of piles in row and anchor on overall stability of foundation pit.(3)Analyzed the change law of overall stability of foundation pit when changing the parameters of pile in row and anchor;Analyzed the influence of waterproof curtain on overall stability of foundation pit.