长江漫滩区明挖隧道基坑降承压水环境影响研究  

Environmental effects of confined aquifer dewatering for cut and cover tunnels in floodplain areas of Yangtze River

作　　者：王峻 刘松玉[2] 张心源 徐海源 王晓琼 李世龙[3,4] 孙彦晓 WANG Jun;LIU Songyu;ZHANG Xinyuan;XU Haiyuan;WANG Xiaoqiong;LI Shilong;SUN Yanxiao(Jiangsu Provincial Transportation Engineering Construction Bureau,Nanjing 210004,China;Southeast University,Nanjing 211189,China;China Railway 14th Bureau Group Co.,Ltd.,Ji'nan 250101,China;China Railway 14th Bureau Group Mega Shield Construction Engineering Co.,Ltd.,Nanjing 211800,China)

机构地区：[1]江苏省交通工程建设局,江苏南京210007 [2]东南大学,江苏南京211189 [3]中铁十四局集团有限公司,山东济南250101 [4]中铁十四局集团大盾构工程有限公司,江苏南京211800

出　　处：《岩土工程学报》2024年第S02期221-225,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(41972269,52178384,52008098);江苏省交建局项目(2021QD05)。

摘　　要：长江漫滩区地质条件复杂,承压水位高,明挖隧道基坑降承压水可能会引起一定程度的沉降,进而引起建构筑物破坏及生命财产损失。针对该问题,以江阴靖江长江隧道江南标段明挖隧道基坑工程降水施工为例,建立了降承压水有限元模型,分析了邻近敏感别墅区的水位降深、沉降及倾斜特性,并研究了不同止水帷幕设计对沉降的影响。结果表明,降承压水引起的地表沉降稳定速度较慢,降水10,30,60,120 d时,别墅区最大沉降为2.5,4.3,5.4,6.1cm。倾斜稳定相对较快,最大倾斜约0.0002,满足规范要求。本工程止水帷幕设计变更方案可使别墅区最大沉降降低63.5%。在基坑主线将第二承压含水层隔断可最高效地进一步降低别墅区最大沉降。Confined aquifer dewatering for cut and cover tunnels in the floodplain areas of Yangtze River characterized by complicated geological condition and high confined water level may result in considerable ground settlements,which may potentially cause structural damages and losses of life and property.Aiming at this issue,the finite element model for the confined aquifer dewatering is developed based on the southern part of a cut and cover tunnel of the Jiangyin-Jingjiang Yangtze River Tunnel Project,and the characteristics of drawdown,ground settlement and incline of a sensitive villa district are analyzed.The effects of various designs of curtain on the ground settlements are also studied.It is found that the settlements induced by the confined aquifer dewatering cannot converge fast.The maximum settlements of the villa district for 10,30,60 and 120 days of dewatering are 2.5,4.3,5.4 and 6.1 cm,respectively.The inclines converge faster with the maximum value of 0.0002,which meets the requirements of China's standard.The altered curtain design can reduce the maximum settlement in the villa district by 63.5%.Cutting off the second confined aquifer in the mainline can further reduce the maximum settlement with the highest efficiency.

关 键 词：明挖隧道基坑 承压水 降水 环境影响 数值模拟 

分 类 号：TU46.3[建筑科学—结构工程]