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利用fish语言实现了在PFC中建立不同JRC值的粗糙节理模型,从细观角度研究粗糙节理的直剪特性和破坏情况。与此同时也分析了节理面附近颗粒不同粘结强度和不同摩擦系数对节理力学性质的影响。结果如下:随着剪切的进行节理面颗粒粘结发生断裂产生微裂纹,随剪切位移的增加微裂纹不断累积从而形成宏观破坏,法向荷载较大时所产生的微裂纹数量也较多,节理面形貌损伤更严重;节理面颗粒粘结强度增大时节理峰值抗剪强度也会增大,节理抗剪强度参数C_j和φ_j也会随粘结强度的增加而增大,φ_j值的增幅要稍大于C_j;节理面颗粒摩擦系数增加时峰值抗剪强度会相应增加,摩擦系数对φ_j值有着较大影响,其随摩擦系数的增加出现较大涨幅,C_j值也会随着摩擦系数而增加只是相比φ_j而言其所受影响较小。
Using the language of fish, the rough joint model with different JRC values in the PFC was established, and the direct shear properties and damage of the rough joint were studied from the microscopic point of view. At the same time, the effect of different bond strengths and friction coefficients on the mechanical properties of joints was also analyzed. The results are as follows: With the shear of the joint surface particles bonded to produce micro-cracks, with the increase of shear displacement micro-cracks accumulate to form a macro-damage, the larger the normal load generated more micro-cracks , The morphology of the joint surface is more serious. The joint peak shear strength increases with the increase of the bond strength of the joint surface. The joint shear strength parameters Cj and φj also increase with the increase of the bond strength. The value of φj The increase of the friction coefficient is larger than that of Cj; the peak shear strength of the joint surface increases with the increase of the friction coefficient, and the friction coefficient has a great influence on the value of φj, which increases greatly with the increase of the friction coefficient, The increase of the coefficient is less affected than φ_j.