An enhanced index for evaluating natural joint roughness considering multiple morphological factors affecting the shear behavior
An enhanced index for evaluating natural joint roughness considering multiple morphological factors affecting the shear behavior
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DOI：
10.1007/s10064-019-01700-1
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发表时间：
2019-12
影响因子：
4.2
通讯作者：
Leibo Song;Q. Jiang;Li-fu Li-Li-fu-Li-2107915101;Chang Liu;Xiaopei Liu;J. Xiong
中科院分区：
文献类型：
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作者：
Leibo Song;Q. Jiang;Li-fu Li-Li-fu-Li-2107915101;Chang Liu;Xiaopei Liu;J. Xiong
节理形态的准确描述是理解天然节理抗剪特性和估计其抗剪强度的关键。对5组具有不同形态特征的节理试件在不同法向荷载作用下进行了剪切试验。试验结果表明，剪切方向上的倾角、凹凸度高度和节理后坡形态对剪切行为有显著影响。考虑到这三种因素对节理抗剪性能的影响机理，提出了一种新的指标——剪切粗糙度系数（SRC）来准确估计岩石节理的抗剪强度。利用该指标，将经典的JRC-JCS抗剪强度模型从二维面扩展到三维面，提高了估计精度，反映了剪切方向对节理抗剪强度的影响。
Accurate description of joint morphology is a key issue for understanding natural joint’s shear behavior and estimating its shear strength. Five sets of joint specimens with different morphological characteristics are shearing tested under different normal loads. These test results reveal that three factors, i.e., inclination angle, asperity height, and morphology of the joint back slope along the shear direction, significantly affect shear behavior. Considering the affecting mechanism of these three factors on joint’s shear behavior, a new index, named shear roughness coefficient (SRC), is proposed to accurately estimate the shear strength of rock joints. With the help of this new index, the classical JRC-JCS shear strength model can be extended from 2D to 3D surface of natural joint, which can improve estimation accuracy and reflect the shearing direction effect on joint’s shear strength.