| Civil and Hydraulic Engineering |
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| Improved calculation of settlement due to dewatering of foundation pits in phreatic aquifer |
| WU Yi qian,ZHU Yan peng |
1. College of Civil Engineering,Lanzhou Institute of Technology,Lanzhou 730050,China;
2. School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;
3. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou 730050,China.
4. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou 730050,China |
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Abstract The settlement of surrounding soils will be caused by dewatering engineering of foundation pit in phreatic aquifer, which easily leads to a series of accidents. in order to solve the problem, The effect of the group wells was ignored. The equation of the water-table depression was solved on the supposition of Dupuit presupposition. The effective stress principle of unsaturated soil in draining areas was leaded and the horizontal component of the additional stress due to seepage force at the same time was considered. Then the settlement of the soil layers above and under the cone of water-table depression was respectively calculated based on the layer-wise summation method, and the actual settlement around the wells after dewatering was the sum of the both. The comparison and analysis with numerical simulation and monitoring of the engineering examples show that the calculation method has a practical engineering value．
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Published: 01 November 2016
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潜水地区基坑降水诱发地面沉降的一种改进算法
针对潜水地区的基坑工程中抽降潜水会引发周围土体沉降,带来一系列的工程事故问题,忽略群井效应后基于裘布依假设求出基坑降水后井周地下水位的降落漏斗曲线方程.引入疏干带非饱和土体的有效应力原理,同时考虑降水产生的渗流力而引发的最终附加应力在水平方向上存在分量,采用分层总和法分别计算水位降落漏斗曲线上下疏干土与饱和土各自的竖向沉降量,叠加后得到抽降水后井周地表的最终总沉降量.通过数值模拟计算并结合具体的工程实例监测数据进行对比分析.研究结果表明,提出的改进计算方法具有较高的工程实用价值.
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