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粗糙度是解释岩石裂隙力学及渗流特性的重要参数.采用自制模具,在轴向中部劈裂岩样,形成垂直于岩样轴向的新鲜裂隙.通过测取7组47个圆柱形岩样裂隙面188条轮廓曲线,分析了粗糙度系数JRC、粗糙轮廓指数Rp、粗糙角i、分维D和截距A等参数的相互关系.结果表明:JRC与岩样组成矿物颗粒大小关系密切,粒径越大,JRC越大.JRC与Rp-1呈明显的对数关系,而不是直线关系;JRC与粗糙角i为正相关关系,由Z2和Rp得到的粗糙角i相差不大,当i大于7.2时,后者大于前者,否则,前者大于后者.JRC与截距A近似满足公式JRC=37.087+16.235A,因此,截距A可以用于描述粗糙度大小.对于同组岩样来说,JRC与分维D负相关,但相关性很低;在除砂岩外的5组岩样之间,粗糙度平均值JRCave与分维平均值Dave有较好的正相关关系.总体上,JRC随尺度增加而增加,而分维D随之增加而降低.
Roughness is an important parameter to explain the rock fracture mechanics and seepage characteristics.It is made of self-made mold, which splits the rock specimen in the middle of the axial direction to form fresh fractures perpendicular to the axial direction of the rock specimen.Through measuring 7 groups of 47 cylindrical rock specimens, Surface 188 profile curves and analyzed the relationship between the parameters of roughness coefficient JRC, roughness profile index Rp, roughness angle i, fractal dimension D and intercept A. The results show that the JRC is closely related to the size of the rock samples, The larger the JRC, the larger the JRC. JRC and Rp-1 showed a significant logarithmic relationship, rather than a straight line relationship; JRC and rough angle i is a positive correlation between the roughness angle i obtained by the Z2 and Rp is not much difference, when i The latter is greater than the former, otherwise, the former is greater than the latter.JRC and intercept A approximately satisfy the formula JRC = 37.087 + 16.235A, so intercept A can be used to describe the roughness size.For the same group of rock samples Said that JRC is negatively correlated with fractal dimensions D, but the correlation is very low. Between the five samples except sandstone, the average roughness JRCave has a good positive correlation with the average fractal dimension Dave.Overall, JRC increases with the increase of scale, while the fractal dimension D increases with decreasing.