位移加载法下的盾构隧道开挖面被动破坏数值模拟研究  

Numerical Simulation Study on Passive Failure of Shield Tunnel Excavation Face Based on Displacement Loading Method

作　　者：邹鸿浩 ZOU Honghao(JSTI Group Co.,Ltd.,Nanjing,Jiangsu Province,210019 China)

机构地区：[1]苏交科集团股份有限公司,江苏南京210019

出　　处：《科技资讯》2024年第23期190-193,共4页Science & Technology Information

摘　　要：针对盾构隧道中的开挖面稳定性问题,分析了盾构施工过程中的实力情况,总结了适用于开挖面主动、被动破坏研究的开挖面支护力加载方式。以砂土地层的浅埋盾构隧道的被动破坏为例,详细介绍了数值模拟中位移加载法的使用办法,分析了位移加载法下的极限支护力、开挖面上的支护力分布、开挖面土体位移、地表沉降特点。结果表明:在开挖面稳定性的被动破坏研究中,采用位移加载法更为合理,其数值模拟结果与实际工程中的开挖面被动破坏的特征吻合良好。In response to the stability issues of shield tunnel excavation faces,an analysis of the the strength situa-tion in excavation process was conducted,and excavation face support force loading method applicable to active and passive failure investigations of the excavation face were summarized.Taking the passive failure of a shallow-buried shield tunnel in sandy soil layer as an example,the usage of displacement loading method in numerical simu-lations was elaborated.The ultimate support force under displacement loading method,support force distribution on the excavation face,soil displacement on excavation face,and characteristics of landmark settlement are analyzed.The results indicated that the displacement loading method is more reasonable for passive failure investigations of ex-cavation face stability,and the numerical simulation results using the displacement loading method align well with the observed features of actual excavation-induced passive failure in engineering projects.

关 键 词：位移加载法 盾构隧道 开挖面稳定性 数值模拟 被动破坏 

分 类 号：U455[建筑科学—桥梁与隧道工程]