长江三角洲地区深基坑降水与地面沉降模拟预测耦合模型研究

长江三角洲地区深基坑降水复杂,且极易引起地面沉降地质灾害问题,传统的基于地下水动力学原理的解析解模型(Theis公式或Dupuit公式)已难以满足降水设计模拟计算的需要,尤其是无法预测降水引起的地面沉降问题,深基坑降水与地面沉降耦合模型将地下水渗流模型和土体应力-应变模型耦合起来,可根据基坑地下水位的控制要求,同时模拟计算出降水井的布局、各井的开采量和地面沉降量。据此确定出的基坑降水方案既能满足地下水位的控制要求,又能对降水引起的地面沉降进行最优化控制。

Studies on simulative and predictive coupling model for deep foundation pit dewatering and land-subsidence in Yangtze River Delta region

Deep foundation pit dewatering is complex and geological disasters are easily caused by land subsidence in Yangtze River Delta region. The traditional analytic solutions (Theis formula or Dupuit formula) of groundwater dynamics were difficult to meet the needs of simulation and calculation in the design of simulation, particularly hard to predict the land subsidence caused by dewatering. According to the control requirements of groundwater level, the layout of dewatering wells, discharge and land subsidence could be simulated and calculated by deep foundation pit dewatering and land-subsidence coupling model which coupled together with groundwater flow model and the soil stress-strain model. Accordingly a foundation pit dewatering scheme was achieved, which met the control requirements of groundwater level and optimal control for land subsidence.