深基坑降水的双层结构模型及有限元计算

基于不同水文地质层水流运动特征的差异，考虑到土层降水-固结过程中渗透系数和贮水系数随土层物理力学参数的非线性变化，对基坑降水过程中的地下水流计算，提出了可同时求出各分层地下水位的双层结构数学模型及有限元计算方法．润扬长江公路大桥南锚基坑工程降水计算表明．双层结构模型为深基坑降水与沉降的非线性耦合计算，基坑土体变形预测、控制，工程施工和设计提供了新的计算分析途经．

Double-layer structure model and FEM calculation of dewatering of deep foundation pits

In consideration of different characteristics of water flows in different hydrogeological stratums and the non-linear relationships between hydraulic conductivity coefficient, storativity, and physical-mechanical parameters of soil-layers during the dewatering-consolidation process, a double-layer structural numerical model and FEM are put forward to calculate the groundwater flow during the process of foundation pit dewatering. With the model, the groundwater table of each soil layer can also be obtained. As an example, the model is applied to calculation of the dewatering process for the south anchor foundation pit of the Runyang Yangtze River Highway Bridge. The results show that the double-layer structure model provides a new method for nonlinear coupling calculation of the dewatering of deep foundation pits and settlement, for prediction and control of soil deformation of foundation pits, and for engineering construction and design.