Damage mechanism and stability analysis of rock mass in the high geo-stress tunnel subjected to excavation
Damage mechanism and stability analysis of rock mass in the high geo-stress tunnel subjected to excavation
复制标题
高地应力隧道开挖岩体损伤机理及稳定性分析
DOI：
10.1080/19475705.2021.2015458
复制
发表时间：
2021-12
期刊：
影响因子：
--
通讯作者：
Xingyang Deng
中科院分区：
文献类型：
--
作者：
Quanfu Ding;Biao Li;Haijian Su;Nuwen Xu;Xuehua Li;Xingyang Deng
摘要西南双江口水电站尾水调压室交通洞地应力高，地质条件复杂。该隧道多次出现开挖引起的岩片剥落、岩爆等围岩破坏。为评价隧道开挖过程中围岩的稳定性，引入了高精度微地震监测技术。通过分析MS事件的时空分布特征，研究了MS事件的主要危害区及其影响因素。根据MS事件的震源参数，揭示了MS团簇的岩石破裂机制。建立三维模型，得到岩体的应力和变形特性。结果表明，MS事件主要发生在2017年7月10日至26日，这一时期的能量释放较高。岩体的主要破坏区位于K 0 + 110 m-K 0 + 170 m处。软弱结构和多洞室效应加剧了开挖卸荷岩体的破坏。岩体的破裂形式主要为拉张破坏。其中，受软弱结构影响的岩体破坏尤为突出。数值模拟结果与MS监测结果一致。研究结果可为类似隧道的安全评价和施工设计提供参考。
Abstract High geo-stresses and complicated geological conditions are two typical characteristics in the traffic tunnel of the tailrace surge chamber at the Shuangjiangkou hydropower station, Southwest China. Rock failures such as spalling and rockbursts induced by excavation were encountered repeatedly in this tunnel. To evaluate the stability of rock mass of the tunnel during excavation, the high-precision microseismic (MS) monitoring technology was introduced. Through analysing the tempo-spatial distribution characteristics of MS events, the main damage areas and their influencing factors were studied. The rock fracturing mechanisms of MS clusters were revealed based on the source parameters of MS events. A three-dimensional model was established to obtain the stress and deformation characteristics of rock mass. Results indicated that the MS events mainly occurred between July 10 and 26, 2017 and the energy release was higher during this period. The main damage areas of rock mass were located at the Stake K0 + 110m–K0 + 170m. Weak structures and multi-cavern effect aggravated rock mass damage subjected to excavation-unloading. Tensile failure was the main fracturing type of rock mass. Rock mass damage influenced by weak structures was especially prominent. The numerical simulation results are consistent with the MS monitoring results. The results could provide significant references for safety evaluation and construction design of similar tunnels.
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DOI：
10.1016/j.ijrmms.2008.01.012
发表时间：
2008-12-01
影响因子：
7.2
作者：
Li, Shouju;Yu, He;Wu, Fengji
通讯作者：
Wu, Fengji
影响因子：
4.4
作者：
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DOI：
10.1016/j.ijrmms.2009.02.010
发表时间：
2009-07
影响因子：
7.2
作者：
J. Andersson;C. Martin
通讯作者：
J. Andersson;C. Martin
影响因子：
4.4
作者：
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Hui Wang;Peng-qiang Zheng;Wen-juan Zhao;H. Tian
影响因子：
6.9
作者：
Hao, YH;Azzam, R
通讯作者：
Azzam, R