摘要
邻近隧道的基坑开挖、邻近隧道水土流失或隧道自身的水土流失均可导致隧道周围局部或者大范围的土体松动,并引起已有隧道周围土体应力的变化,以致改变隧道横向受力模式,影响隧道的结构安全.首先对一工程实例进行了详细介绍,在此基础上采用有限元数值方法研究了隧道侧部不同松动角度、不同松动程度下隧道横向承载能力和隧道结构形态的变化模式,揭示了隧道灾害发展过程中隧道管片混凝土应力、接头处螺栓应力以及管片接头张开量等指标达到临界值的先后规律.研究结果表明,隧道侧部松动首先导致隧道腰部接头内侧混凝土受压剥落,隧道竖向收敛值达到0.5%D(D为隧道外径),进而顶部接头螺栓受拉屈服以致断裂.
Excavation engineering adjacent to existing tunnel and the soil and water erosion around shield tunnel would cause the stresses of the soil around the tunnel changed. Local or extensive loosening of the soil would change transverse deformation pattern and affect structural safety of the tunnel. An engineering project was introduced in detail. Furthermore, based on the finite element numerical method, transverse bearing capacity and deformation pattern of shield tunnel was studied, suffering soil loosening at different angles and extents. The changing regularities of segment concrete stresses, blot stresses and opening size of joints were summarized. The results show that the loosening of the soil results in that the inside concrete of the tunnel joints at the springline peels off, then the convergence deformation of the tunnel reaches 0.5%D（D is the outside diameter）, finally the joint bolts at the crown yield and fracture.
出处
《天津大学学报（自然科学与工程技术版）》
EI
CSCD
北大核心
2017年第12期1304-1313,共10页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金重点资助项目(41630641)~~
关键词
盾构隧道
土体松动
横向变形
结构安全
shield tunnel
soil loosening
transverse deformation
structural safety
