基于地下水渗流方程的三维地面沉降模型

Three-dimensional analysis of land subsidence based on groundwater flow model

针对地下水抽取引起的大面积地面沉降的问题,提出了一种计算方法。该方法基于饱和与不饱和岩土介质中地下水渗流理论,计算出三维状态下的大面积地面沉降。提出的方法被结合到地下水渗流的三维有限元法分析中,计算时考虑了地层的可压缩性,并被用来分析软土的固结,将该法与太沙基理论及固结试验的结果进行比较,结果表明其误差小于2%。该法还被用来分析单井抽取承压地下水引起的周围地基的沉降及承压水层由于挡水板的阻断作用而引起的下游侧的地基的沉降。

An approach to calculate land subsidence due to withdrawal of groundwater is presented. This approach is based on the theory of groundwater flow in saturated and unsaturated media. The proposed approach calculates the land subsidence in 3D condition. In the calculation the compressibility of ground was considered. The proposed method was employed to analyze the consolidation of soft clay layer and compared with the result by Terzaghi’s theoretical solution and odometer test. The results show that the differ...