Computer Simulation Research Of Foundation Pit Anchor Bolting With Considering Of Construction Process

Along with the high speed development of our nation's social economy, middle and tall structures increase rapidly. The depth of some foundation pits has reached to 20 to 30 meters below horizon. Most of them must be braced instead of direct excavation because of the limited working space. Almost all the calculation about deep foundation pit anchor bolting done by internal and external scholars up to now has an assumption that the pit is excavated to the bottom in one step. So to do research into construction process' influence upon results is very significant.I attach myself to lab simulation test of deep foundation pit anchor bolting first and finish it completely. The relationships from vertical soil pressure, axial stress of anchor, lateral displacement of foundation to construction process are got by test data analysis. The lab test also provides the basic parameters for computer simulation research.Computer simulation uses a finite element software called ANSYS. Two FEA models are established. One model simulates lab simulation test. Two relationships from vertical soil pressure, axial stress of anchor,lateral displacement of foundation to construction process are compared. Shear stress distribution disciplinarian of anchor segment is also carried out from FEA model. The other model simulates a new finished fact foundation pit. Two relationships from slope top lateral displacement of foundation, settlement volume of foundation to construction process are compared. The relationship between axial stress of anchor and construction process is also carried out from FEA model.Both the lab test and the computer simulation analysis demonstrate that construction process has influence to every surveyed item, lateral displacement and settlement volume are influenced much more violently.