水工隧洞围岩裂纹扩展的临界水压解析解

›› 2012, Vol. 33 ›› Issue (8): 2429-2436.

水工隧洞围岩裂纹扩展的临界水压解析解

卞康¹，肖明²，胡田清²

1. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071； 2. 武汉大学水资源与水电工程科学国家重点实验室，武汉 430072

收稿日期:2011-04-15 出版日期:2012-08-10 发布日期:2012-08-13
作者简介:卞康，男，1982年生，博士，助理研究员，主要从事岩土工程地质灾害等方面的研究工作

Analytical solutions of critical water pressure when cracks propagating in surrounding rock of hydraulic tunnel

BIAN Kang¹，XIAO Ming²，HU Tian-qing²

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China

Received:2011-04-15 Online:2012-08-10 Published:2012-08-13

摘要/Abstract

摘要： 通过把断裂力学扩展判据引入水工隧洞解析解中，使宏观的水工隧洞受力分析与细观的围岩裂纹扩展研究相结合；将隧洞围岩裂纹分为拉剪型裂纹和压剪型裂纹，并针对不同类型裂纹的开展机制，分别推导了水工隧洞围岩拉剪型和压剪型裂纹扩展时的临界内水压力表达式。在此基础上，分析了裂纹的走向、长度、埋深等参数对临界水压的影响规律。算例显示，在高内水压力作用下，或者由于地应力释放的影响，裂纹既可能发生拉剪型扩展，也可能发生压剪型扩展，但后者发生的几率更大。在内水压力控制工况下，当裂纹走向垂直于洞壁法线方向时最不容易发生扩展；裂纹长度越长，埋深越浅，围岩孔隙水的作用面积越大，裂纹发生扩展的可能性越大。

关键词: 圆形隧洞, 水力劈裂, 拉剪型裂纹, 压剪型裂纹, 临界水压

Abstract: The extension criterion of fracture mechanics is introduced to analytical solutions of hydraulic tunnel, and the macroscopic load-bearing analysis of hydraulic tunnel and mesoscopic crack propagation research are combined. After classifying cracks in surrounding rock nearby tunnel into shear-tensile and shear-compressive types, analytical solutions of critical inner water pressure of hydraulic tunnel are derived when hydraulic fracture happens in the surrounding rock, according to extension mechanism of different variety of cracks. Based on the proposed analytical solutions, the influence on critical inner water pressure of trend, length, depth of cracks is researched. The results show that both shear-tensile type and shear-compressive type cracks may occur because of high inner water pressure or release of geostress; but the latter one has more probability. Under high inner water pressure, the crack will extend much more difficult than other conditions when the trend of crack is perpendicular to the normal of tunnel. The longer of crack length, the smaller of crack buried depth, the bigger of contact area between pore water and rock masses, the more easily cracks will extend.

Key words: circular tunnel, hydraulic fracture, crack of shear-tensile type, crack of shear-compressive type, critical water pressure

中图分类号:

TV 3

卞康，肖明，胡田清 . 水工隧洞围岩裂纹扩展的临界水压解析解[J]. , 2012, 33(8): 2429-2436.

BIAN Kang ，XIAO Ming ，HU Tian-qing . Analytical solutions of critical water pressure when cracks propagating in surrounding rock of hydraulic tunnel[J]. , 2012, 33(8): 2429-2436.

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