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为研究天然煤岩体中多裂纹的相互作用规律,采用经典Kachanov法,通过分析应力强度因子比的变化,研究了拉剪作用下不等长平行偏置双裂纹间水平距离、垂直距离以及裂纹长度对彼此相互作用的影响规律.并借助RFPA2D软件对不同间距条件下的裂纹起裂扩展进行数值模拟验证,其结果与理论计算吻合良好.结果表明:裂纹间的相互影响包括强化作用、屏蔽作用和零效应3种形式,且三者随水平距离、垂直距离和裂纹长度的不同而相互转化;距离裂纹尖端越近,强化作用越强烈,且强化作用变化速率也越快,距离裂纹中心越近,屏蔽作用越强烈,且屏蔽作用变化速率也越快,裂纹长度越长,其影响范围也越大.
In order to study the interaction law of multi-cracks in natural coal and rock mass, the Kachanov method was used to analyze the horizontal distance, vertical distance and crack width Length of the interaction between the law and RFPA2D software for crack growth under different spacing conditions for numerical simulation validation, the results agree well with the theoretical calculations.The results show that: the interaction between cracks, including strengthening, shielding effect And zero effect of the three forms, and the three with the horizontal distance, vertical distance and crack length of the different conversion; the closer to the crack tip, the stronger the strengthening effect, and the strengthening effect of the rate of change faster, closer to the center of the crack , The stronger the shielding effect, and the faster the shielding effect changes, and the longer the crack length, the greater the influence range.