Comparison between Empirical Estimation by JRC-JCS Model and Direct Shear Test for Joint Shear Strength
Comparison between Empirical Estimation by JRC-JCS Model and Direct Shear Test for Joint Shear Strength
复制标题
JRC-JCS模型经验估计与直剪试验接头剪切强度的比较
DOI：
10.1007/s12583-011-0193-6
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发表时间：
2011-06-01
影响因子：
3.3
通讯作者：
Guo Xiao
中科院分区：
文献类型：
--
作者：
Du Shigui;Hu Yunjin;Guo Xiao
为了研究JRC（节理粗糙系数）-JCS（节理抗压强度）模型经验估算节理抗剪强度的可靠性，选取不同岩性特征、不同尺寸的天然岩石节理作为样本，通过直剪试验测定其在干燥和饱和条件下的抗剪强度，并与JRC-JCS模型估算值进行比较。对比结果表明，对于节理面紧密配合的天然岩石节理，节理抗剪强度经验估算与直剪试验的平均相对误差为9.9%；如果 JRC 的确定考虑了剪切过程中的方向统计测量、尺度效应和表面平滑，则 JRC-JCS 模型对接缝剪切强度的经验估计的可靠性在干燥和饱和条件下都很好。但对于节理面不匹配的天然岩石节理，节理抗剪强度经验估算与直剪试验的平均相对误差为39.9%；在干燥和饱和条件下，JRC-JCS 模型对接缝抗剪强度的经验估计的可靠性是值得怀疑的。
In order to study the reliability of the empirical estimation of joint shear strength by the JRC (joint roughness coefficient)-JCS (joint compressive strength) model, natural rock joints of different lithologic characteristics and different sizes were selected as samples, and their shear strengths under dry and saturated conditions were measured by direct shear test and compared to those estimated by the JRC-JCS model. Comparison results show that for natural rock joints with joint surfaces closely matched, the average relative error of joint shear strength between empirical estimation and direct shear test is 9.9%; the reliability of the empirical estimation of joint shear strength by the JRC-JCS model is good under both dry and saturated conditions if the JRC is determined accounting for directional statistical measurements, scale effect and surface smoothing during shearing. However, for natural rock joints with joint surfaces mismatched, the average relative error of joint shear strength between empirical estimation and direct shear test is 39.9%; the reliability of empirical estimation of joint shear strength by the JRC-JCS model is questionable under both dry and saturated conditions.