不同连通率断续节理岩体直剪破坏特征

发布时间：2018-06-04 19:16

本文选题：断续节理 + 连通率　；参考：《工程地质学报》2017年02期

【摘要】：在边坡稳定性评价中,不同形态、连通率及排列方式的岩桥起决定性作用。本文通过开展室内直剪实验并结合声发射特征参数的研究,揭示了不同连通率岩桥和不同法向应力状态下断续节理岩体的破坏规律。结果表明:在直剪条件下,随法向应力及连通率的变化,岩体破坏面呈现"一"、"X"、"锯齿"、"Z"以及复合型破坏,破坏面起伏度较小,且贯通破坏无时间先后性。法向压力一定时,随着断续岩桥连通率的提高,声发射事件累计计数峰值呈线性增长,计数峰值不断趋于增长。在岩桥连通率一定的情况下,随法向应力的增大,声发射事件计数峰值与累计计数在中等法向应力下最大。对断续节理岩桥变形破坏特征的研究,有利于分析节理岩体的力学特性,有助于边坡工程的稳定性评价与预测。
[Abstract]:In slope stability evaluation, rock bridges with different shape, connectivity and arrangement play a decisive role. In this paper, the failure law of discontinuous jointed rock mass under different connectivity rock bridges and different normal stress states is revealed by means of indoor direct shear experiments and the study of acoustic emission characteristic parameters. The results show that under the direct shear condition, with the change of normal stress and connectivity, the failure plane of rock mass presents "one", "X", "sawtooth", "Z" and composite failure, the fluctuation of failure surface is relatively small, and there is no time sequence for through failure. When the normal pressure is constant, the accumulative peak value of acoustic emission events increases linearly with the increase of the connectivity ratio of intermittent rock bridges, and the peak value of the counting increases continuously. With the increase of normal stress, the peak and accumulative counting of acoustic emission events are maximum under the medium normal stress when the connectivity ratio of rock bridges is constant. The study of deformation and failure characteristics of intermittent jointed rock bridges is beneficial to the analysis of mechanical properties of jointed rock masses and to the evaluation and prediction of slope engineering stability.
【作者单位】：地质灾害防治与地质环境保护国家重点实验室(成都理工大学);
【基金】：国家重点基础研究发展计划(973)项目(2013CB733202) 国家自然科学基金项目(41130745,41272330,41572283)资助
【分类号】：TU45

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