半明半暗隧道开挖围岩整体稳定性评价  

Evaluation of Overall Stability of Surrounding Rock in Half Light and Half Dark Tunnel Excavation

作　　者：田鲁鲁 Tian Lulu(Yunnan Construction and Investment Holding Group Co.,Ltd.)

机构地区：[1]云南省建设投资控股集团有限公司,昆明市650501

出　　处：《勘察科学技术》2022年第4期1-6,21,共7页Site Investigation Science and Technology

摘　　要：为研究半明半暗隧道在施工过程中的围岩整体稳定性,该文选取典型半明半暗隧道断面,结合不同结构类型岩体条件进行了理论分析研究。通过研究得出以下结论:1)半明半暗隧道在开挖过程中可能发生坠落式失稳、沿极限破裂面失稳和沿软弱结构面失稳共3种整体失稳模式;2)对每种围岩整体失稳模式均提出了稳定性的初判和复判方法,可以分别求得不考虑预加固措施的围岩稳定性系数和考虑预加固措施的围岩稳定性系数;3)通过对围岩整体稳定性系数反算,可以拟定合理的围岩预加固措施支护参数。In order to study the overall stability of the surrounding rock during the construction of the half light and half dark tunnel, this paper selects the typical section of the half light and half dark tunnel and carries out theoretical analysis and research in combination with the rock mass conditions of different structural types. The conclusions are as follows: 1) There are three kinds of overall instability modes, such as falling instability, instability along the ultimate fracture surface and instability along the weak structural surface, which may occur during the excavation of half light and half dark tunnels;2) For each overall instability mode of surrounding rock, the preliminary judgment and rejudgment methods of stability are put forward. The stability coefficients of surrounding rock without pre reinforcement measures and considering pre reinforcement measures can be obtained respectively;3) Through the inverse calculation of the overall stability coefficient of surrounding rock, the reasonable supporting parameters of surrounding rock pre reinforcement measures can be worked out.

关 键 词：偏压隧道 稳定性 理论分析 围岩 半明半暗 

分 类 号：U455[建筑科学—桥梁与隧道工程] U451.2[交通运输工程—道路与铁道工程]