Numerical evaluation of the ground response induced by dewatering in a multi-aquifer system

作     者：Yong-Xia Wu Qian Zheng Annan Zhou Shui-Long Shen Yong-Xia Wu;Qian Zheng;Annan Zhou;Shui-Long Shen

作者机构：College of Mechanical and Automotive EngineeringShanghai University of Engineering ScienceShanghai 201620China Department of Civil and Environmental EngineeringCollege of EngineeringShantou UniversityShantouGuangdong 515063China Civil and Infrastructure EngineeringSchool of EngineeringRoyal Melbourne Institute of Technology(RMIT)Victoria 3001Australia MOE Key Laboratory of Intelligent Manufacturing TechnologyCollege of EngineeringShantou UniversityShantouGuangdong 515063China 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2021年第12卷第5期

页      面：384-396页

核心收录：

学科分类：081803[工学-地质工程] 081401[工学-岩土工程] 08[工学] 0818[工学-地质资源与地质工程] 0814[工学-土木工程] 

基　　金：funded by the National Nature Science Foundation of China(NSFC)(Grant No.41807235) funded by“The Pearl River Talent Recruitment Program”in 2019(Grant No.2019CX01G338) Guangdong Province and the Research Funding of Shantou University for New Faculty Member(NTF19024-2019) 

主　　题：Excavation pit Pumping test Settlement Wall deflection Numerical simulation 

摘      要：This study presents a numerical investigation of dewatering-induced settlement and wall deflection during pumping tests in Tianjin,*** 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 *** groundwater drawdown,seepage field,ground settlement,horizontal ground displacement,and diaphragm wall lateral deflection are analyzed using the FEM *** 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.