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岩石中各种类型裂隙的相互影响是致使其变形破碎的重要原因,基于经典Kachanov法,通过分析所得应力强度因子比变化趋势,分别研究了拉剪和压剪两种状态下平行偏置双裂纹间水平距离、垂直距离、裂纹长度以及裂纹倾角对其相互作用的影响规律,对含不等长平行偏置裂纹的类岩试件进行单轴压缩试验,通过预制裂纹的起裂扩展和起裂荷载变化规律对理论分析进行了对比验证。结果表明:裂纹间的相互影响包括强化、屏蔽和零效应三方面,且随水平距离、垂直距离、裂纹长度和倾角的不同而相互转化;距离裂纹尖端越近,屏蔽和强化作用变化越剧烈,K_Ⅰ,K_Ⅱ分别在裂纹倾角为60°和30°时变化较剧烈。
Based on the classical Kachanov method, by analyzing the trend of the change of stress intensity ratio, the parallel offset double cracks under both tension and shear conditions are studied respectively. The interaction of various types of fractures in rock is the main reason that causes deformation and fracture. The horizontal distance, the vertical distance, the length of the crack and the dip angle of the crack were studied. The uniaxial compression tests were carried out on the rock samples with parallel offset cracks of unequal length. Through the crack initiation and propagation The change rule of load carries on contrast verification to the theoretical analysis. The results show that the interaction between cracks includes three aspects: strengthening, shielding and zero effect, and they transform with the horizontal distance, vertical distance, crack length and inclination; the closer to the crack tip, the more intense the shielding and strengthening action, The changes of K_Ⅰ and K_Ⅱ are more severe at the crack angles of 60 ° and 30 °, respectively.