Study On Sheet Pile Model Tests Of Deep Foundation Pit

Deep foundation pit excavation and bracing is a topic in geotechnical engineering, including strength and stabilization of soil mechanics,and transmutation and sedimentation of deep foundation, and common effect between soil and shoring structure. With the development of high and towering building, the application and the study of the deep foundation pit excavation supporting technology becomes more and more important. However it has not have a systemic theory and design method about the deep foundation pit engineering because of its complexity and uncertainty. It exist a lot of problems in designing and constructing.The scholar of inside and outside did a lot of study in the development of foundation pit engineering design method, including indoor model tests, road-test and theory discussion. Model test method is an important way to research and solve the problem of geotechnical engineering, therein to, the indoor model test has good maneuverability, high repeat at relatively, and it also has exerted important effect in scientific research, design and argumentation of engineering.The paper based on the design and fabrication of indoor model test device by Yu Xiao professor of Wuhan university of science and technology and his student Su Xiaoke, on the other side, it designed the load device and the anchored device, and optimized the displacement test systems, and then did the indoor model test of foundation pit simulate excavation by this test device.This paper respectively explored the destroy mechanism of cantilever and anchored sheet pile support structure on the soil pressure under the different loads, and comprehensively carried through cantilever and anchored sheet pile support test under five-grades excavation depth and five-grades load combination, and specially researched the transformation of soil pressure, the plane displacement of the top of sheet pile, the surface sedimentation of support side, the inside displacement of support side, the transformation of the anchored power under the different load or different excavation depth or different support mode on the process of foundation pit excavation, thereby it offered gist for analysis and design of internal force and transmogrification of sheet pile support structure.