苏州地区紧邻地铁深大基坑的设计与实践

Design and practice of deep large foundation pits close to subway in Suzhou area

随着城市轨道交通的迅猛发展,使越来越多的深大基坑工程紧邻运营或在建地铁车站隧道,此类深基坑工程必须采取安全可靠的支护方案来保证基坑和地铁结构的安全。苏州狮山街道—苏地2014-G-7号地块项目为与轨道交通3号线横山路站无缝对接的深大基坑,结合项目的设计和成功实践,分别从基坑分区、支护体系、降水、土体加固及土方开挖等方面总结了邻轨深大基坑设计方法和措施。数值模拟及监测数据结果表明:该工程采用的专项保护方案及措施,有效保证了地铁车站结构及设施的安全,验证了围护方案安全可靠,为类似工程提供参考。

With the rapid development of urban rail transit,more and more deep and large foundation pit projects are close to the operation or subway station tunnel under construction,this kind of deep foundation must adopt safe and reliable support scheme to ensure the safety of foundation and subway structure.Suzhou Shishan Street Sudi 2014-G-7 plot project is a deep and large foundation pit seamless with Hengshan Road Station of rail transit line 3.Combined with the design and successful practice of the project,this paper summarizes the design methods and measures of adjacent rail deep and large foundation pit from the aspects of foundation pit zoning,support system,precipitation,soil reinforcement and earthwork excavation.The results of numerical simulation and monitoring data show that the special protection scheme and measures adopted in this project effectively ensure the safety of subway station structure and facilities,verify the safety and reliability of enclosure scheme,and provide reference for similar projects.