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从岩石结构面尺寸对岩石强度变化与破坏模式的研究出发,为了全面地研究其影响性,建立了不同裂隙倾角下不同尺度大小的颗粒流数值模型,进行单轴压缩数值试验。结果表明:随着裂隙尺度的增大,岩石的抗压强度有所降低,起裂和达到峰值强度所需的应变更小;随着裂隙夹角的增大,岩石的抗压强度有所增加,但其随尺度变化的敏感度有所降低,同时裂隙尺度对起裂点的影响也越来越小;在本文预制裂隙张开度,单轴压缩作用下,达到岩石峰值强度时裂纹贯通模式受裂隙倾角影响较大。
Based on the research on the rock strength change and failure mode of rock structural plane, in order to comprehensively study its influence, a numerical model of particle flow with different scales and different fissure dip angles was established for uniaxial compression numerical test. The results show that with the increase of fracture size, the compressive strength of the rock decreases, and the strain required for the initiation of cracking and the peak strength is smaller. As the crack angle increases, the compressive strength of the rock increases , But its sensitivity to the change of scale decreases somewhat, meanwhile, the influence of the crack size on the initiation and cracking point is also getting smaller and smaller. Under the pre-crack opening degree and uniaxial compression, the crack through mode Inclination greater impact.