某供水隧洞进口仰坡稳定性研究  

Study on the Stability of Inlet Slope of a Water Supply Tunnel

作　　者：张春瑜[1] ZHANG Chunyu(China Railway 18th Bureau Group Co.Ltd.,Tianjin 300222,China)

机构地区：[1]中铁十八局集团有限公司,天津300222

出　　处：《铁道建筑技术》2023年第10期187-190,共4页Railway Construction Technology

基　　金：中铁十八局集团有限公司科技研究开发计划项目(G20-03)。

摘　　要：为研究供水隧洞进口全风化花岗岩仰坡稳定性及隧洞开挖对仰坡的影响,采用二维边坡极限平衡法和三维有限元强度折减法对隧洞开挖前的洞口仰坡进行稳定性分析,结果表明:极限平衡法和三维有限元强度折减法安全系数计算结果分别为1.435和1.837 9,仰坡处于稳定状态;基于三维有限元强度折减法结合隧洞开挖过程对仰坡安全系数变化规律进行分析,结果表明:随隧洞开挖,仰坡安全系数降低,而伴随支护施作进程仰坡安全系数呈增大趋势。In order to study the stability of the front slope of completely weathered granite at the inlet of the water supply tunnel and the impact of tunnel excavation on the front slope,two-dimensional slope limit equilibrium method and three-dimensional finite element strength reduction method are used to analyze the stability of the front slope of the tunnel portal before excavation.The safety factors obtained by the limit equilibrium method and three-dimensional finite element strength reduction method are 1.435 and 1.8379,respectively,and the front slope is stable.The three-dimensional finite element strength reduction method is used to analyze the change laws of tunnel excavation on the safety factor of the front slope.The results show that as the safety factor of the front slope decreases during tunnel excavation,the safety factor of the front slope increases with the construction of support.

关 键 词：隧洞仰坡 极限平衡法 强度折减法 稳定性 

分 类 号：U459.6[建筑科学—桥梁与隧道工程] U453.1[交通运输工程—道路与铁道工程]