Optimization of confined aquifer dewatering for long-deep excavation using simulation–optimization method  

作　　者：Yanxiao Sun Zhenxiong Jiang Liyuan Tong Jiawei Sun Jia Cui Xin Zhou Songyu Liu 

机构地区：[1]Institute of Geotechnical Engineering,Southeast University,Nanjing 211189,China [2]Nanjing Modern Multimodal Transportation Laboratory,Nanjing 211100,China [3]Jiangsu Provincial Transportation Construction Bureau,Nanjing 210004,China

出　　处：《Underground Space》2024年第4期246-266,共21页地下空间（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41972269 and 52178384);the Project of Jiangsu Provincial Transportation Construction Bureau,China(Grant No.2021QD05).

摘　　要：The confined aquifer dewatering for long-deep excavations usually encounters challenges due to complicated geotechnical conditions,large excavation sizes,and high hydraulic pressures.To propose the most efficient scheme of confined aquifer dewatering for long-deep excavations,dewatering optimizations were performed using the simulation–optimization method.An open cut tunnel of the Jiangyin-Jingjiang Yangtze River Tunnel Project was taken as an example.The methods of finite element and linear programming(LP)were combined to optimize the dewatering process.A three-dimensional finite element model was developed.After simulating the pumping tests,hydraulic conductivity was inverted.Then,necessary parameters in the LP method were determined by simulating dewatering with each pumping well,and various LP models were developed based on some important influence factors such as dewatering sequence,considered pumping wells,and pumping rate limitation.Finally,the optimal pumping rates were solved and applied to the numerical model,with induced drawdown and ground settlement computed for comparison.The results indicate that the optimization can significantly reduce the required wells in the original design.Dewatering in the deepest zone exhibits the highest efficiency for long-deep excavations with gradually varying depths.For the dewatering sequence from the shallowest to the deepest zone,more pumping wells are required but less energy is consumed.Higher quantity and more advantageous locations of pumping wells in the LP model usually result in lower total pumping rate,drawdown,and ground settlement.If more pumping wells are considered in the deepest zone,pumping rate limitation of single well will only slightly increase the total pumping rate,number of required pumping wells,drawdown,and ground settlement.

关 键 词：DEWATERING Confined aquifer Simulation-optimization Linear programming Open cut tunnel 

分 类 号：P64[天文地球—地质矿产勘探]