高地应力条件下深埋洞室围岩损伤区孕育机制
发布时间：2018-11-05 19:30
【摘要】：随着人类地下空间开发活动逐渐走向地球深部,高地应力已成为地下岩体工程典型的地质特征之一,并严重影响深埋洞室围岩的安全稳定。本文首先分析了我国地应力场分布规律,然后分别采用理论计算和数值模拟方法,研究了地应力准静态卸荷及瞬态卸荷条件下围岩损伤的产生机理与演化规律,最后结合加拿大URL地下实验室及锦屏二级水电站深埋引水隧洞围岩损伤检测结果,进一步探讨了高地应力条件下不同卸荷方式对围岩损伤区形成及特征的影响。研究结果表明:与地应力准静态卸荷相比,瞬态卸荷会在围岩中产生一个附加动应力,从而放大围岩径向卸载和环向加载效应,使得围岩更容易受损;随着侧压力系数的增大,瞬态卸荷和准静态卸荷诱发的围岩损伤范围均增大,并且在最小主应力方向上围岩损伤主要表现为剪切破坏,而在最大主应力方向上主要表现为拉破坏。
[Abstract]:With the development of human underground space gradually towards the deep earth, high ground stress has become one of the typical geological characteristics of underground rock mass engineering, and has seriously affected the safety and stability of the surrounding rock. In this paper, the distribution law of in-situ stress field in China is analyzed at first, and then the mechanism and evolution of surrounding rock damage under quasi-static unloading and transient unloading are studied by theoretical calculation and numerical simulation, respectively. In the end, combined with the damage detection results of the underground laboratory of URL in Canada and the deep diversion tunnel of Jinping II Hydropower Station, the influence of different unloading modes on the formation and characteristics of surrounding rock damage area under the condition of high in-situ stress is further discussed. The results show that the transient unloading will produce an additional dynamic stress in the surrounding rock compared with the quasi-static unloading of the in-situ stress, thus amplifying the radial unloading and circumferential loading effects of the surrounding rock and making the surrounding rock more easily damaged. With the increase of lateral pressure coefficient, the damage range of surrounding rock induced by transient unloading and quasi-static unloading increases, and the damage of surrounding rock in the direction of minimum principal stress is mainly manifested as shear failure. In the direction of maximum principal stress, tensile failure is the main manifestation.
【作者单位】： 三峡大学水利与环境学院;武汉大学水资源与水电工程科学国家重点实验室;
【基金】：国家自然科学基金项目(51609127) 湖北省自然科学基金项目(2016CFB238) 国家重点基础发展计划(973)项目(2011CB076354)资助
【分类号】：TV221.2
本文编号：2313144
[Abstract]:With the development of human underground space gradually towards the deep earth, high ground stress has become one of the typical geological characteristics of underground rock mass engineering, and has seriously affected the safety and stability of the surrounding rock. In this paper, the distribution law of in-situ stress field in China is analyzed at first, and then the mechanism and evolution of surrounding rock damage under quasi-static unloading and transient unloading are studied by theoretical calculation and numerical simulation, respectively. In the end, combined with the damage detection results of the underground laboratory of URL in Canada and the deep diversion tunnel of Jinping II Hydropower Station, the influence of different unloading modes on the formation and characteristics of surrounding rock damage area under the condition of high in-situ stress is further discussed. The results show that the transient unloading will produce an additional dynamic stress in the surrounding rock compared with the quasi-static unloading of the in-situ stress, thus amplifying the radial unloading and circumferential loading effects of the surrounding rock and making the surrounding rock more easily damaged. With the increase of lateral pressure coefficient, the damage range of surrounding rock induced by transient unloading and quasi-static unloading increases, and the damage of surrounding rock in the direction of minimum principal stress is mainly manifested as shear failure. In the direction of maximum principal stress, tensile failure is the main manifestation.
【作者单位】： 三峡大学水利与环境学院;武汉大学水资源与水电工程科学国家重点实验室;
【基金】：国家自然科学基金项目(51609127) 湖北省自然科学基金项目(2016CFB238) 国家重点基础发展计划(973)项目(2011CB076354)资助
【分类号】：TV221.2
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1 卢文波;陈明;严鹏;周创兵;;高地应力条件下隧洞开挖诱发围岩振动特征研究[J];岩石力学与工程学报;2007年S1期
，本文编号：2313144
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