考虑侧向变形下抽降潜水引起地面沉降的计算

Calculation of settlement considering lateral deformation due to pumping of phreatic aquifer

针对工程降水会给周边环境带来风险的问题,忽略降水工程的群井效应,基于裘布依假设求出基坑降水后地下水位的降落漏斗曲线方程.考虑到降水产生的附加应力在水平方向存在分量,采用分层总和法分别计算水位降落曲线上下疏干土与饱和土的地面沉降量,叠加后得到最终坑周地表的沉降量.结合数值计算及工程实例监测数据进行对比分析,表明改进算法比规范算法更接近实际,能够较准确地预测计算不同降深下由工程降水引发的周边不同距离的地表沉降量.

In view of the risks to the surrounding environment caused by the dewatering engineering,the effect of the group wells was ignored,and the equation of the water-table depression was solved based on the supposition of Dupuit presupposition.Additional stress due to dewatering in the horizontal component was considered,and then the settlements of the soil layers above and below the cone of water-table depression were calculated respectively based on the layer-wise summation method,thus the actual settlement was the sum of them.Comparison of numerical calculation results with monitoring data of the engineering examples show that the improved calculation method is more accurate than normative method,which can bring the accurate predict results of settlement with different drawdown and distance due to dewatering engineering.