| Reduce the groundwater is the key technique of the construction of foundation pit. the survey shows that the majority of pit accidents related to groundwater; the red clay have a low permeability. but when the groundwater in a high level, the seepage also significant, we should pay more attention; currently rarely little study consider the impact of the deformation on red clay Deep Foundation Pit. So it has very important significance to make the study. Based on the previous research results, we give full consideration to the characteristics of deep foundation pit construction, establish the Finite Element Model to simulation the excavation and the precipitation, the Main work are as follows:(1) This article describes the basic properties of red clay, the basic theoretical of dewatering and seepage, foundation deformation and stability analysis.(2) Use a simple pit slope as an example, analyzes the c, the φ’s impact on the value of pit slope stability. Then make a contrast, Draw the conclusion that theφ have bigger effect than the c.(3) Combined with a foundation pit project, then adopt the finite element analysis software to make a comparative analysis,and explore the change rule of Supporting structure, Pit surface subsidence, Pit uplift value.(4) With the consideration of seepage condition analysis of changes of soil moisture content in the process of construction, different block solid depth, different anchoring force and different forms of support, such as the impact of factors of foundation pit deformation were investigated. The measures and methods of controlling deformation and stability of foundation pit are discussed. Then provide reference for design and construction of foundation pit engineering.(5)When considering seepage, select the sensitivities of the five factors influencing foundation pit deformation analysis, obtains horizontal displacement of the sensitivity value of these five factors. |
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