基于目标函数法的隧道盾构井基坑降水优化设计  

Optimization Design of Dewatering for Shield Tunnel Well Foundation Pit Based on Objective Function Method

作　　者：谢明泽 黄勇[1] XIE Mingze;HUANG Yong(School of Earth Sciences and Engineering Hohai University,Nanjing,Jiangsu 211100)

机构地区：[1]河海大学地球科学与工程学院,江苏南京211100

出　　处：《中国煤炭地质》2025年第3期22-28,70,共8页Coal Geology of China

基　　金：国家自然科学基金委员会联合基金项目“长江上游流域水文循环机理与基于气陆耦合的暴雨洪水预报”(U2240217)。

摘　　要：为提升基坑降水工程中降水效率,减少过度的抽水设计,节约工程成本,基于目标函数法建立的基坑降水优化模型,以基坑降水工程总成本为目标函数,以防渗帷幕深度、抽水井数量、单井抽水量为设计变量,对基坑降水方案进行优化设计,求取不同防渗帷幕深度下的抽水井数量与单井抽水量,利用MATLAB软件中的Fmincon函数对优化模型求解。通过此优化方法对海太过江隧道南岸明挖段盾构井基坑进行优化设计,并利用Visual MODFLOW Flex软件对优化方案验证分析。结果表明,在保障周围环境安全、满足工程设计要求的前提下,Fmincon函数优化方案较原方案防渗帷幕深度减少13 m;抽水井数量减少7口,井深累计减少260 m;抽水井一昼夜抽水量累计减少13675 m^(3);总成本累计减少约16.8%。因此,基于目标函数法利用Fmincon函数进行基坑降水优化设计是合理可行的。In order to improve the efficiency in foundation pit dewatering engineering,reduce excessive pumping design,and save engineering costs,an optimization model for foundation pit dewatering is established based on the objective function method.The total cost of foundation pit dewatering engineering is taken as the objective function,and the depth of impervious curtain,number of pumping wells,and single well pumping volume are taken as design variables to optimize the design of foundation pit dewatering scheme and calculate the number of pumping wells and single well pumping volume under different depths of impervious curtain.The optimization model is solved using the Fmincon function in MATLAB software.This optimization method is used to optimize the design of the shield tunnel foundation pit on the south bank of the Haitai River Crossing Tunnel,and the optimization plan is verified and analyzed using Visual MODFLOW Flex software.The results show that,while ensuring the safety of the surrounding environment and meeting the requirements of engineering design,the Fmincon function optimization scheme reduces the depth of the impervious curtain by 13 m compared to the original scheme.The number of pumping wells has decreased by 7,and the cumulative depth of wells has decreased by 260 m.The cumulative decrease in pumping capacity during one day and night is 13675 m^(3)and the total cost has decreased by approximately 16.8%.Therefore,it is reasonable and feasible to use the Fmincon function based on the objective function method for optimizing the design of foundation pit dewatering.

关 键 词：基坑降水 目标函数法 数值模拟 海太过江隧道 

分 类 号：P641[天文地球—地质矿产勘探]