土体隧洞贯通段稳定分析及加固措施研究  

Stability characteristics and reinforcement measures for breakthrough section of soil tunnel

作　　者：曹爱武 魏桦 褚卫江 陈平志 CAO Aiwu;WEI Hua;CHU Weijiang;CHEN Pingzhi(PowerChina Huadong Engineering Corporation Limited,Hangzhou 311122,China;HydroChina Itasca R&D Center,Hangzhou 311122,China;2510 Engineering Construction Headquarters)

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122 [2]浙江中科依泰斯卡岩石工程研发有限公司,浙江杭州311122 [3]2510工程建设指挥部

出　　处：《人民长江》2022年第8期140-143,148,共5页Yangtze River

摘　　要：贯通段稳定性对于双向开挖隧洞的安全影响较大。为评估软土隧洞贯通段稳定特性,基于解析方法提出了贯通段潜在破坏模式及安全系数计算方法,进一步利用数值模拟方法验证贯通段破坏模式及其安全系数,并研究了超前支护对贯通段稳定性的改善作用。对以色列Kokhav Hayarden抽水蓄能电站工程软土隧洞贯通段进行了稳定及加固作用分析。分析计算结果表明:在双向开挖隧洞扰动程度相当时,软土隧洞贯通段表现为双滑面破坏模式;超前支护可明显改善贯通段稳定特性,极限扰动情况下采用管棚支护,贯通段安全系数从1.06提高至1.15,施加管棚和玻璃纤维锚杆组合支护后,安全系数进一步提高至1.23。研究成果可为软土隧道贯通段稳定特性研究提供一定的依据。Stability of breakthrough section has a great influence on safety of double heading construction tunnel.In order to evaluate the stability of the breakthrough section of soil tunnel,a potential failure mode and a calculation method of safety factor are proposed based on analytical method,and the numerical simulation method is furtherly used to verify the failure mode of the tunnel breakthrough section and the safety factor.On this basis,we study the improvement effect of the advance support on the stability of the breakthrough section.Aiming at a soil tunnel in a pumped power station,the stability and reinforcement of the breakthrough section are analyzed.The results show that the breakthrough section of the soft soil tunnel shows a double-slip failure mode under the similar disturbance at both sides.Advanced support can significantly improve the stability of the breakthrough section.Using pipe roof in extreme disturbance conditions,the factor of safety(FoS)increases from 1.06 to 1.15.Jointly using the pipe roof and glass fiber anchor as support,the FoS increases to 1.23.This method provides a certain basis for studying the stability of breakthrough section of soil tunnels.

关 键 词：双向开挖隧道 隧洞贯通段稳定性 隧洞破坏模式 超前支护 

分 类 号：TU432[建筑科学—岩土工程]