In rock engineering of the cold region, there are a lot of rock joints. The shear characteristics of joints play a decisive role in the stability of rock engineering in the cold area. In this paper, based on the numerical simulation method of particle flow, reasonable microscopic parameters are selected for the numerical simulation of the direct shear test of bolted joints. The results show that the shear stiffness and contact modulus are linearly and positively correlated. The greater the contact modulus, the greater the residual stress, the better the synergetic effect between rock and bolt, and the more developed the microcrack. The smaller the contact stiffness ratio, the greater the residual stress. The shear stiffness decreases with the increase in the contact stiffness ratio, and the larger the contact stiffness ratio, the slower the shear stiffness decreases, while the shear strength does not change with the contact stiffness ratio. The contact stiffness ratio has a weak effect on the number of cracks in the model. The shear stiffness increases with the increase in the parallel bond modulus, and the shear strength decreases with the increase in the parallel bond modulus. The binding stiffness is independent of the shear stiffness, and the peak shear stress decreases with the increase in the binding stiffness ratio. The greater the bond stiffness ratio, the greater the number of cracks.

中文翻译：

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考虑岩石的细观形变特征的螺栓连接的剪切破坏

在寒冷地区的岩石工程中，存在许多岩石节理。节理的剪切特性对寒冷地区岩石工程的稳定性起决定性作用。本文基于颗粒流的数值模拟方法，选择了合理的微观参数进行螺栓连接直接剪切试验的数值模拟。结果表明，剪切刚度和接触模量呈线性正相关。接触模量越大，残余应力越大，岩石与螺栓之间的协同作用越好，并且微裂纹越发达。接触刚度比越小，残余应力越大。剪切刚度随着接触刚度比的增加而降低，并且接触刚度比越大，剪切刚度降低得越慢，而剪切强度却不会随接触刚度比而变化。接触刚度比对模型中的裂纹数量影响很小。剪切刚度随平行键模量的增加而增加，剪切强度随平行键模量的增加而减小。结合刚度与剪切刚度无关，并且峰值剪切应力随着结合刚度比的增加而减小。粘结刚度比越大，裂纹数量越多。剪切强度随着平行结合模量的增加而降低。结合刚度与剪切刚度无关，并且峰值剪切应力随着结合刚度比的增加而减小。粘结刚度比越大，裂纹数量越多。剪切强度随着平行结合模量的增加而降低。结合刚度与剪切刚度无关，并且峰值剪切应力随着结合刚度比的增加而减小。粘结刚度比越大，裂纹数量越多。