基于正反向直剪试验的岩石节理JRC值计算研究

doi:10.13722/j.cnki.jrme.2021.0671

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摘要剖面线JRC值是利用Barton的JRC-JCS抗剪强度模型估算岩石节理抗剪强度的关键参数，目前关于岩石节理剖面线JRC定量计算的研究成果非常丰富，但是考虑剪切方向影响的岩石节理JRC值计算研究还较为欠缺。为此，在对10条Barton标准剖面线进行精细数字化处理获得其二维坐标数据的基础上，考虑剪切方向影响，计算剖面线坡度均方根一阶导数值，同时，开展具有Barton标准剖面线形貌特征的人工模拟岩石节理试件正反向直剪试验，在此基础上利用正反向直剪试验，反算JRC值和对应的剖面线值，通过回归分析，建立考虑剪切方向的岩石节理剖面线JRC值对数和幂指数经验计算公式，并将经验公式JRC计算值与直剪试验反算JRC值进行比较，结果表明，幂指数关系式更适合计算正向剪切下的岩石节理剖面线JRC值，而对数关系式更适合计算反向剪切下的岩石节理剖面线JRC值。

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	肖维民1
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关键词 ：岩石力学, 岩石节理, 节理粗糙度系数JRC, 正反向直剪试验

Abstract：JRC is a key parameter to predict the shear strength of rock joint by using Barton?s JRC-JCS model. Although there are massive researches on methods for calculating JRC of a rock joint profile，few researches had been reported on the calculation of rock joint JRC value by considering shear direction. Herein，based on the 2D coordinate data of Barton?s ten standard profiles derived from fine digitization process，firstly the root mean square of the first derivative of the profile was calculated by consideration of shear direction. Meanwhile，forward and reverses direct shear tests were performed on artificial rock joint specimens which were of the same topography of Barton?s standard profiles. Then non-linear regression analyses were performed between JRC and which were respectively derived from back-calculation of forward and reverses direct shear test results and 2D coordinate data of standard profiles，from which empirical logarithmic and exponential expressions were obtained for determining the JRC value of rock joint profile considering shear direction. Furthermore，the predictions of JRC values derived from the above-mentioned empirical logarithmic and exponential expressions were compared with these back-calculated from forward and reverses direct shear tests. From the comparisons，it showed that the empirical exponential expression was more suitable for calculating the JRC of rock joint profile in forward direct shear tests，while the empirical logarithmic expression was more suitable for reverse direct shear tests condition.

Key words： rock mechanics rock joint joint roughness coefficient JRC forward and reverse direct shear test

引用本文:

肖维民1，2，刘伟超1，2，朱占元1，2. 基于正反向直剪试验的岩石节理JRC值计算研究[J]. 岩石力学与工程学报, 2021, 40(S2): 3098-3106.
XIAO Weimin1，2，LIU Weichao1，2，ZHU Zhanyuan1，2. Study on calculation of rock joint JRC value based on forward and #br# reverse direct shear tests. , 2021, 40(S2): 3098-3106.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0671 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/IS2/3098

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