Simulation Analysis For Support Structure Of Deep Excavations And Control For Construction Risk

With the higher of floor of buildings and the exploitation of underground space,the building structure and form has getting increasingly complicated. It requires the growing demands for deep foundation pit engineering, there will be more and more problems as a result. It causes the ground movement around the foundation pit to a certain extent during them. Therefore,it makes varying degrees of additional deformation of surrounding buildings or underground pipeline, and the structure cracks and damages when the additional deformation be excessive, then the normal use of surrounding buildings or underground pipeline are be affected. It has strict requirements to the settlement control of excavation for the deep foundation pit engineering in urban complex environment. and the design and construction is difficult, so a small mistake can lead to engineering accident.Based on above points and investigation on the correlated factors about the construction risk during the foundation pits excavation, on account of the forms of support structure and the types of underground diaphragm wall. taking dynamic simulation to the excavation of deep foundation pit with the large finite element analysis software ABAQUS. In a air shaft of the subway deep foundation pit,compared with the actual monitoring data and the simulation results, analyzed and studied stability of the foundation pit during excavation, validity of support means and correlation between the soils of bearing layer with the support way. To make it stable and safety and reduce the unnecessary staff and costs. Meanwhile, providing the technical basis for finishing the project and providing scientific basis for controlling the construction risk in other similar projects.