Numerical evaluation of the ground response induced by dewatering in a multi-aquifer system
Numerical evaluation of the ground response induced by dewatering in a multi-aquifer system
复制标题
多含水层系统中脱水引起的地面响应的数值评估
DOI：
10.1016/j.gsf.2021.101209
复制
发表时间：
2021-09
影响因子：
8.9
通讯作者：
Shen Shui-Long
中科院分区：
文献类型：
--
作者：
Wu Yong-Xia;Zheng Qian;Zhou Annan;Shen Shui-Long
本文对天津地区抽水试验期间的排水引起的沉降和墙体变形进行了数值研究。根据抽水试验中实测的地下水水头和建筑物沉降量，采用有限元法建立了三维流固耦合模型。通过数值模型反算了各层的孔隙比、渗透系数和弹性模量。利用有限元模型分析了地下水位降深、渗流场、地面沉降、地面水平位移和地下连续墙侧移。模拟结果表明：（1）由于弱透水层的渗漏作用，基坑外地表最大沉降达82 mm，抽水试验过程中土体产生较大的水平位移，最大值达28.3 mm，在含水层中设置地下连续墙可以减小土体的水平位移;（iii）长期抽水会导致地下连续墙产生较大的侧向挠度，最大值出现在威尔斯筛管所在层，为23.2 mm;及（iv）开挖前应避免长期大规模抽水。
This study presents a numerical investigation of dewatering-induced settlement and wall deflection during pumping tests in Tianjin, China. Based on the measured groundwater head and building settlement during the pumping test, a three-dimensional liquid–solid coupling model is established by using the finite element method (FEM). The void ratio, hydraulic conductivity, and elastic modulus of each layer are back-calculated through the numerical model. The groundwater drawdown, seepage field, ground settlement, horizontal ground displacement, and diaphragm wall lateral deflection are analyzed using the FEM model. The simulated results demonstrate that (i) the maximum ground settlement outside of the excavation reaches to 82 mm due to the leakage effect of aquitards; (ii) large horizontal displacement occurs in the soil during the pumping test with a maximum value of 28.3 mm, and the installation of the diaphragm wall in the aquifer can reduce the horizontal displacement of the ground; (iii) long-term pumping causes a large lateral deflection of the diaphragm wall, and a maximum value of 23.2 mm occurs at the layer where the screens of the wells are located; and (iv) long-term large-scale pumping should be avoided before excavation.
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