复合含水层地区深基坑降水三维渗流场数值模拟以上海环球金融中心基坑降水为例
NUMERICAL SIMULATION OF THREE-DIMENSIONAL SEEPAGE FIELD OF A DEEP FOUNDATION PIT DURING DEWATERING IN A COMPLEX COMPOSITE AQUIFER SYSTEMCASE STUDY OF DEWATERING OF A PIT AT THE SHANGHAI FINANCE CENTER
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摘要: 长江三角洲分布有巨厚、松散的第四纪沉积层,地下含水系统为一复合含水层系统,深基坑降水一般采用非完整井,且由于深基坑周围连续挡水墙难以深入含水层底板,所以其地下水渗流场变化极其复杂,具有明显的三维流特征。本文以上海环球金融中心深基坑降水为例,采用数值模拟方法,模拟了在多层含水层复合存在、含水层最深底板埋深达149m、基坑周围挡水连续墙埋深达34m、基坑内地下水位降深达26m的情况下的地下水三维渗流场特征,并以此为据确定出了该基坑降水的最优化方案。Abstract: Multi-layer loose and thick Quaternary sediments in the Yangtzi River delta create a complex aquifer system.Partial pumping wells used in dewatering project and the diaphragm wall not attached to the bottom of layer around pits result in a very complex characteristic of three-dimensional groundwater seepage in the foundation pit.In this paper authors use the dewatering of the foundation pit at Shanghai Finance Center as a case study to demonstrate how the three-dimensional finite-difference numerical method can be used to characterize the groundwater seepage in the foundation pit.It is a multi-layer aquifer system with a confining layer at a depth of 149 m,a pits diaphragm wall at a depth of 34 m and an anticipated water level drop of 26 m within the pit.An optimized method for dewatering of the foundation pit is eventually derived.
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