Mechanical Property Tests Of Cohesive Soil And Stability Analysis Of Foundation Pit Supporting

Foundation pit supporting technology is one of the key problems in geotechnical engineering research, and reasonable construction scheme is conducive to the stability of the supporting structure. In this paper, based on a deep excavation project in Huainan, the mechanical properties of cohesive soil are tested, and the reasonable foundation pit support and precipitation scheme are established, and the numerical simulation and stability analysis are carried out. It plays an important role in the project smoothlyFirst of all, the theories of foundation pit supporting are summarized, mainly in the form of foundation pit supporting, design principles, design content and stability, and so on. Combined with the theoretical knowledge and engineering overall profile and cohesive soil mechanical properties, based on LIZHENG software for foundation pit supporting and dewatering design, and checked the stability of the supporting design.Conventional geotechnical test and consolidated quick shear test of cohesive soil in foundation pit are carried out. Conventional geotechnical tests mainly include the density of the cohesive soil, the moisture content and the determination of the boundary water content and so on. Shear strength test of undisturbed soil and reconstituted soil is carried out by the consolidated quick shear test. The using of ORIGIN is to fit a straight line, to determine the water content in the conditions of the cohesive soil cohesion and internal friction angle. It is concluded from the experiment that the variation tendency of the cohesive force, internal friction angle and shear strength of undisturbed soil and soil is different.According to the concrete construction scheme, the numerical simulation is carried out by PLAXIS software. Taking the Mohr-Coulomb criterion, the excavation is carried out in five steps, and the numerical simulation of the process is carried out. The maximum horizontal displacement, settlement trend, uplift degree and soil nail deformation are analyzed, and the change law of the horizontal displacement, settlement and the degree of uplift of the foundation pit is obtained.In this paper, the design, numerical simulation and stability analysis of the foundation pit project are carried out, which provides reasonable suggestions and theoretical guidance for the foundation pit engineering, and made a further prospect. It has important engineering value and significance.