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Numerical Test Research on the Shear Strength Parameters of Rock Joints Based on the Fractal Theory

机译：基于分形理论的岩石关节剪切强度参数的数值试验研究

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摘要

Based on the fractal simulation of rock joints, two types of numerical direct shear test models of rock joints were established, and the scale effect and the infill effect of the shear strength parameters of the rock joint were studied by using the numerical test method. The results of the first type of numerical direct shear test show that the critical joint size (CJS) exists by which the scale effect of the shear strength parameters of the rock joint can be eliminated. With the increase of the fractal dimension of the rock joint, the scale effect becomes more outstanding and the critical joint size develops larger. The results of the second type of shear direct test show that when the ratio of the infill thickness t to the asperity height a of rock joints (abbreviated as the thickness-height ratio t/a in the following of this paper) is less than 1, the shear strength parameters of rock joints are controlled by the joint roughness, the mechanical properties of rock wall and infill material, and the shear strength parameters of rock joints decrease rapidly as the t/a ratio increase. When t/a is bigger than 1, the shear strength parameters are mainly controlled by the mechanical property of infill material and the value of shear strength parameters indicates infill material.
机译：基于岩石关节的分形模拟，建立了两种类型的岩会关节数值直接剪切试验模型，使用数值试验法研究了岩窝剪切强度参数的尺度效应和填充效应。第一类型数值直接剪切试验的结果表明，临界关节尺寸（CJS）存在，通过该临界接头尺寸（CJS）可以消除岩链接头的剪切强度参数的比例效应。随着岩石关节的分形尺寸的增加，比例效应变得更加出色，临界关节尺寸变得更大。第二种类型的剪切直接测试的结果表明，当填充厚度T与岩石接头的粗糙度A的比率（在本文之上的厚度高比率T / A缩写时）小于1 ，摇滚关节的剪切强度参数由联合粗糙度，岩壁和填充材料的机械性能控制，并且岩接头的剪切强度参数随着T / A比率而迅速降低。当T / A大于1时，剪切强度参数主要由填充材料的机械性能控制，剪切强度参数的值表示填充材料。

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