为探究层状岩体的巴西劈裂各向异性,开展颗粒流数值模拟研究,定义θ角为加载方向与层理法向夹角.结果表明:板岩抗拉强度随θ的增大非线性减小,减小速率逐步放缓,θ=0°和θ=90°时分别为最大和最小值.随θ增大层面方向的裂纹数量增多,层面对板岩破坏的控制作用渐强.4类裂纹的数量分布反映了板岩拉伸和剪切破坏机制和层面对板岩破坏模式及其抗拉强度控制的渐变过程.颗粒流模拟了板岩破坏过程,裂纹从距加载点最近的层面附近萌生,在层面位置无序生成直至连通,此时达到最大载荷,之后穿越层面斜向下延伸,并继续穿越下方层面形成宏观裂纹.%Numerical simulation of particle flow code was carried out to study the direction effect on Brazilian splitting behavior of layered rock mass,and the angle between the loading direction and the normal direction of bedding is named asθ. The results show that the tensile strength of slate decreases in nonlinear with the increase of θ,and the decreasing rate drops gradually and reaches maximum and minimum atθ=0° andθ=90° respectively. With the increase of crack number in bedding orientation,the bedding planes gradually control the slate failure. The number and distribution of four types of crack reflects the tensile and shear failure mechanism of slate and failure mode of slate from bedding planes and its tensile strength control. Parti-cle flow simulates the failure process of slate,and micro-cracks generate at the point nearby bedding plane,which generate ran-domly at bedding plane till connect with each other. Maximum loading is produced at this moment,and then the cracks extend downward and continue through the lower layer to form a macro crack.
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