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首页> 外文期刊>International Journal of Rock Mechanics and Mining Sciences >Numerical simulation of a direct shear test on a rock joint using a bonded-particle model
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Numerical simulation of a direct shear test on a rock joint using a bonded-particle model

机译：结合颗粒模型对岩石节理直接剪切试验的数值模拟

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Rock joints were numerically simulated, and an extensive series of direct shear tests were carried out using the code PFC3D. The feasibility of reproducing a rock joint using the contact bond model was demonstrated, and the effects of the geometrical features and the micro-properties of a joint on its shear behavior were examined. Asperity failure was observed from the micro-cracks and contact force distribution, as well as the stresses and displacements in shear and normal directions. A rough joint with a joint roughness coefficient (JRC) value ranging from 10 to 20 was produced in an intact sample by defining the joint-contacts along a predefined joint surface. To simulate a decrease in joint wall strength (JCS) caused by weathering and alterations, the bond strength between particles involved in the joint-contacts was reduced by up to 70 percent. The shear behavior and failure progress at a given stress corresponded well to those observed in laboratory tests. The friction coefficient was the most important factor governing the shear strength and dilation angle. The variation in joint roughness and contact bond strength had a larger effect on the cohesion than peak friction angle. In addition, a new approach to represent JRC and JCS values of a joint was proposed for practical use. A numerical 3D-profile scanning technique was developed to evaluate the actual JRC of the simulated joint, and the relationship between the JCS and the contact bond strength was investigated.
机译：对岩石节理进行了数值模拟，并使用代码PFC3D进行了一系列直接剪切测试。证明了使用接触粘结模型重现岩石节理的可行性，并研究了节理的几何特征和微观性质对其剪切行为的影响。从微裂纹和接触力分布以及在剪切方向和法线方向上的应力和位移观察到了粗糙破坏。通过沿预定的接合面定义接合点，在完整的样品中产生接合点粗糙度系数（JRC）值为10至20的粗糙接合点。为了模拟由于风化和变化引起的接头壁强度（JCS）的降低，接头接触所涉及的粒子之间的结合强度最多降低了70％。在给定应力下的剪切行为和破坏过程与实验室测试中观察到的结果非常吻合。摩擦系数是决定剪切强度和膨胀角的最重要因素。接头粗糙度和接触粘结强度的变化对内聚力的影响大于峰值摩擦角。另外，提出了一种表示关节的JRC和JCS值的新方法以供实际使用。开发了一种数值3D轮廓扫描技术来评估模拟接头的实际JRC，并研究了JCS与接触粘结强度之间的关系。

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