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5. Conclusions
(1) The three-dimensional finite element numerical simulation method has a good quality to portray the geologic body, and can be used to simulate and analyze complex quaternary loose sediments with great thickness and the engineering structures of dewatering in deep foundation pit, and can serve as the basic theory of optimization design of engineering structures of dewatering in deep foundation pit in such areas.
(2) Improving element conduction matrix adjustment method has been used to deal with the free-water table boundary condition, which could improve the stability of the model.
(3) If it can deal well with the relation between the diaphragm wall of basic pit maintenance and the location of the filters of the pump wells, the foundation pit dewatering method can be used to meet the demand of foundation pit dewatering, and can effectively control land subsidence around the foundation pit in the area of complex quaternary loose sediments with great thickness.
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