摘要
基于武汉和平大道南延(中山路-张之洞路)隧道工程,采用有限元软件分析超大直径盾构下穿岩溶地层的围岩与衬砌的变形受力特征,并探讨盾构施工过程地层损失对溶洞与隧道围岩稳定性的影响。结果表明:当溶洞直径较大时,隧道变形向溶洞位置靠拢,且隧道靠近于溶洞的局部位置结构受力较大,应在工程中引起注意;位于隧道上方的溶洞会使得地表最大沉降增大,可能导致地表塌陷等工程灾害;在施工中应确保地层损失较小,若地层损失过大,将会导致地表沉降明显。研究成果可为同类工程参考与借鉴。
This paper presents a case history of a larger diameter tunnel excavation of South extension of Heping Boulevard(Zhongshan Road to Zhang Zhidong Road) in Wuhan. The stress-strain characteristics of tunnel and its surrounding karstic cavity rock mass are analyzed by the finite element analysis software. The impact of the soil strata loss on the stability of the karstic rock cavity and the surround rock mass are evaluated, The results indicate that, when the size of the rock cavity is relatively large, the deformation of the tunnel is towards to the cavity and the stress in the tunnel structure is larger than that of in other locations. The rock cavity above the tunnel will induce a larger ground subsidence and even induce the sinkhole collapse on the ground surface. In the tunnel excavation, preventive measures should be applied to minimize the soil strata loss since the larger soil loss will induced the excessive ground subsidence.
作者
徐晨
XU Chen(China Railway Siyuan Design and Investigation Group Co.Ltd.,Wuhan 430063;State and Local United Research Center for Underwater Tunnel Engineering,Wuhan 430063)
出处
《土工基础》
2022年第4期559-563,共5页
Soil Engineering and Foundation
关键词
隧道
岩溶
变形
受力
地层损失
Tunnel
Cavity Rock Mass
Deformation
Stresses
Loss of Soil Strata
