深基坑降水与沉降的非线性耦合计算

结合润扬长江公路大桥南锚基坑工程，基于不同水文地质层水流运动特征的差异，对基坑降水过程中的地下水流计算，提出了双层结构数学模型，由此可以同时求出各分层地下水位。在土层降水-固结过程中，考虑到渗透系数和贮水系数随土层物理力学参数的非线性变化，提出了深基坑降水与沉降的非线性耦合计算方法。这为基坑土体变形预测、控制，指导工程施工和设计提供了新的途经。

Nonlinear coupling calculation between dewatering and settlement of deep foundation pits

Combined with foundation engineering of south anchor, Runyang Yangtse River Highway Bridge, based on the difference of flow movement characteristics in the different hydrogeology strata, the groundwater flow is modeled during the foundation pit dewatering; and a double layer structure mathematical model is developed. According to the model, the groundwater table of each soil layer can be calculated simultaneously. In the course of dewatering and consolidation of soil layer, the nonlinear changes between hydraulic conductivity coefficient and storativity coefficient and physico-mechanical parameters of the soil-layer are considered. Consequently, the nonlinear coupling calculation method is put forward between deep foundation pit dewatering and settlement. The method provides a new way for the forecast and control of soil body distortion, and the guidance of engineering construction and design.