Analysis on lining structure safety of large hydraulic tunnel in deep-buried soft rock
LIU Ning1,2, ZHANG Chunsheng1, ZHANG Chuanqing3, CHU Weijiang1,2, CHEN Pingzhi1,2
1. PowerChina Huadong Engineering Corporation Limited, Hangzhou 311122, Zhejiang, China; 2. HydroChina Itasca Research and Development Center, Hangzhou 310014, Zhejiang, China; 3. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China
Abstract: The chlorite schist in Jinping II hydropower station diversion tunnel is a typical engineering soft. The buried depth of chlorite schist is 1 700 m, and the water softening and long-term rheological properties are significant. A series of technical problems such as large extrusion deformation, collapse and rheological were encountered in the construction process. Based on lots of testing and monitoring data, the effect of chlorite schist mineral composition and mesoscopic structure characteristics on its macroscopic mechanical properties were revealed, and the relationship between the peak strength and confining pressure under dry and saturated conditions was clarified. The evolution of deformation over time was also given. Based on the mechanical characteristics of soft rock tunnel composite bearing structure, the impact of 2019年 - 第1卷第2期刘宁,等:深埋大直径软岩水工隧洞衬砌结构安全性分析 \=-water softening and rheological effect on the safety of lining structure were proposed. The mechanism between lining structure safety and lining timing under high in-situ stress soft rock environment was revealed.
刘宁,张春生,张传庆,褚卫江,陈平志. 深埋大直径软岩水工隧洞衬砌结构安全性分析[J]. 隧道与地下工程灾害防治, 2019, 1(2): 92-99.
LIU Ning, ZHANG Chunsheng, ZHANG Chuanqing, CHU Weijiang, CHEN Pingzhi. Analysis on lining structure safety of large hydraulic tunnel in deep-buried soft rock. Hazard Control in Tunnelling and Underground Engineering, 2019, 1(2): 92-99.
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2019, Vol. 1 
