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运用岩石破裂过程分析软件RFPA-dynamics,对应力波作用下含颗粒脆性材料的裂纹扩展过程进行了数值模拟,分析了软硬颗粒及双向荷载对裂纹扩展的影响。结果表明:(1)软硬颗粒对裂纹扩展方式有一定影响:表现在硬颗粒模型中,裂纹水平扩展长度较长,且出现羽状结构裂纹,软颗粒模型裂纹水平扩展长度较短,未出现明显羽状裂纹,空洞模型出现裂纹绕行现象;(2)颗粒与基质弹性模量比值是影响含颗粒物的岩石材料裂纹路扩展方式的主要因素,而各自弹性模量绝对值对其影响不大;(3)双向动态荷载作用下,裂纹在分支前均会沿着初始裂缝的方向前进一段距离,不同荷载比率下试样的裂纹扩展方式不同,表现在随着荷载比率增大,裂纹分叉的角度增大,裂纹扩展距离减小。
Using the software RFPA-dynamics, a numerical simulation of the crack growth process of granular brittle materials under the action of stress wave was carried out. The influence of soft and hard particles and two-way load on the crack propagation was analyzed. The results show that: (1) The hard and soft particles have some influence on the crack growth mode: in the hard particle model, the crack length is longer, and the plume structure crack appears. The crack length of the soft particle model is shorter and does not appear (2) The ratio of particle to matrix elastic modulus is the main factor affecting the way of crack propagation in rock material containing particles, and the absolute value of each elastic modulus has little effect on it ; (3) under the action of bidirectional dynamic load, the crack will advance along the direction of the initial crack a little before the branching. The crack propagation mode of the specimen under different load ratios is different, which means that as the load ratio increases, The angle increases, the crack propagation distance decreases.