Research On Fondation Pit Dewatering Based On Watery Sand Layer And Complex Environments In Shenyang

High groundwater level, gravel and sand aquifer, large permeability and influence radius is the characteristics of Shenyang. At present, the similar studiesof large thickness of sandy soil, large drawdown, and several foundation construction at the same time is very few. The paper researvh the problems encountered in dewatering design and construction of Zhongjie station of Shenyang Subway Line No.1,then summarize the dewatering design method based on watery sand layer and complex environments in Shenyang. That are selecting parameters, arrangment of dewatering well and the comprehensive study on dewatering design at the well group interference.All of this are in order to achieve the reasonable dewatering design and reduce the project cost.In the background of dewatering in Zhongjie station, at first, designing with the given parameters, and using of finite element software COMSOL Multiphysics to simulate the design and the actual process of dewatering, compared with the actual data and find the diffierences between the dewatering design and the actual construction.,at the same time, obtain the advantages and disadvantages by comparing uneven dewatering well arrangement with equal interval dewatering well arrangement. Secondly, it's discussed the issues of dewatering design process in theory,then achieve the reason of large-scale dewatering interference by analysing the water Inflow, which is calculated in theory and simulate again, while finishing the actual monitoring data, the drawdown curve fitting was found. The final part is studying on the impact of arge-scale dewatering interference and calculating the water Inflow under the large-scale dewatering interference.That can cost less than the single dewatering design.Through theoretical calculations and numerical simulation studies, the following conclusions:first,dewatering wells arrangements should be based on the different parts of the requirements, adding wells in the big drawdown, and using numerical simulation to adjust the location of wells to a reasonable deep curve.Second, when two adjacent stations interfere with each other and the three adjacent stations interfere with each other,the formula for calculating water inflow is derived, and calculates the yield of foundation pit under different permeability and different drawdown. At last, the drawdown curve of the water level is obtained from the two adjacent stations interfere with each other and three adjacent stations interfere with each other.