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为了满足工程实际对结构面粗糙度系数JRC的测量要求,采用统计分析和数值模拟方法,以Barton标准粗糙度等级剖面曲线为基础,对大量结构面起伏曲线进行矢量化分析。在充分考虑工程现场结构面起伏形态的实际测量条件基础上,提出利用相对起伏度Ra和伸长率R共同反映结构面粗糙度系数JRC,并将Barton标准粗糙度等级剖面曲线按其与Ra和R的相关性和其几何形态分为平直状、波浪状、锯齿状三类。最终,建立JRC与Ra,R两个因素的经验公式和其图形化表达,分析JRC相对于Ra,R变化的敏感性与R和Ra在各类剖面曲线上的组合范围,并用函数模拟出Barton标准粗糙度等级剖面曲线的起伏形态。为JRC的定量确定及采用JRC-JCS模型快速计算结构面抗剪强度参数提供充足条件。
In order to meet the engineering requirements of measuring the roughness coefficient JRC of structural surface, the statistical analysis and numerical simulation methods were used to conduct vectorial analysis on a large number of undulations of structural plane based on Barton standard roughness profile curves. On the basis of taking full consideration of the actual measurement conditions of the undulation of the structural surface of the engineering site, it is proposed to use the relative undulation Ra and the elongation R to jointly reflect the structural surface roughness coefficient JRC, and to compare the Barton standard roughness profile curve with the Ra and R The correlation and its geometry is divided into flat, wavy, jagged three categories. Finally, the empirical formula of JRC and Ra, R and the graphical expression are established. The sensitivity of JRC to Ra, R and the range of R and Ra on the profiles are analyzed. Barton Roughness profile of the profile of the ups and downs of the curve. It provides sufficient conditions for the quantitative determination of JRC and the quick calculation of shear strength parameters of structural plane using JRC-JCS model.