Layered fractures induced by principal stress axes rotation in hard rock during tunnelling

Layered fractures induced by principal stress axes rotation in hard rock during tunnelling
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隧道掘进过程中硬岩主应力轴旋转引起的层状破裂

DOI:
10.1179/143307511x12858957676399
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发表时间:
2011-02
影响因子:
--
通讯作者:
Qiu, S.
Qiu, S.
中科院分区:
--
文献类型:
--
作者:
Zhang, C.;Zhou, H.;Feng, X.;Xing, L.;Qiu, S.

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摘要锦屏二级水电站深埋隧洞在掘进过程中出现了层状裂隙。利用数值模拟方法和断裂力学的基本理论,研究了中间主应力、应力路径和主应力轴旋转对岩石裂纹扩展的影响机理。此外,通过对试验分支隧道F开挖过程中围岩应力路径和主应力旋转的分析,探讨了层状裂隙的形成机理。
Abstract During tunnelling, layered fractures occurred in the deep tunnels at the Jinping II Hydropower Station. Using numerical simulation methods and the basic theories of fracture mechanics, the mechanism of rock crack propagation influenced by the intermediate principal stress, the stress path and the principal stress axes rotation was studied. In addition, based on the analysis of the stress path and principal stress rotation of the surrounding rock mass in the test branch tunnel F during the excavation process, the mechanism of formation of layered fractures is discussed.
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