岩石结构面尺寸效应的数值仿真研究

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。

Numerical Simulation of Size Effect of Rock Structural Plane

From the viewpoint of size effect of the structural plane on the change of strength and failure mode of rock and in order to explore its effect comprehensively, a series of numerical models are built to conduct the uniaxial compression test,including models with different sizes and different angles of the structural plane in rock sample using Particle Flow Code. The results suggest that with the increase of size of the structural plane, the compressive strength of rock, the strain of crack initiation in rock sample and that for reaching the peak strength are reduced. With the increase of the angle of the structural plane, the compressive strength of rock sample has the same change trend but the sensitivity of strength is reduced. In addition, the influence of the size of the structural plane on the strain of crack initiation in rock sample is less. Under the prefabricated fracture aperture with uniaxial compression test, the mode of crack coalescence in the peak strength of rock sample is affected greatly by the angle of fracture.