Effect Of Geological Conditions On Deformation And Stability Of Multi-prop Deep Foundation Pit

The sufficient exploiture of underground space has become a tendency in development of city. With deeply using of ground space, more and more problems appear which contribute to the development of excavation theory, and which challenge to geological engineering. Now geological engineer must proves up the geological conditions but also nails down the effect of these conditions on some project. From the point of view of geological engineering and civil engineering, this thesis discusses the effect of geological conditions and parameters on calculating of foundation pit, and research the sensitivity of these parameters. By these, we pursue the engineers' better understanding on deformation in excavation, mechanism of wreck in excavation, and on geological conditions in excavation.Firstly, this thesis summarizes the soil parameters and some other issues in multipropped deep foundation pit. We analyze the effect of soil characteristic on earth pressure chart and on retaining wall deformation. The chose of soil is the base of numerical simulation, the more understanding of soil parameter is necessary.Secondly, we analyze the effect of underground water on the deformation and stabilization of multipropped deep foundation pit, and summarize the methods on how to consider the effect of underground water. For accurately simulating the interaction of seepage field and stress field, this thesis adopts the coupled analysis to simulate the deformation in excavation. Contrast to the simulation which didn't consider the interaction of the two fields, we find underground water increase the complexity of stress field, and deteriorate the character of deformation and stabilization.Thirdly, the thesis designed the simulation experiment with the orthogonal design. On this base, carried on 16 times FEM simulation, and found out the effect of soil parameters on deformation in multi-propped excavation.Finally, we simulate the deformation in excavation of foundation pit in underground station .considering 5 work conditions. The result of the inspection accorded with the simulation.Based on the specific the geological conditions and detailed soil parameters, we can effectively simulation the excavation in urban environment.