不同倾角下层状板岩劈裂破坏特性研究

发布时间：2018-04-24 23:05

本文选题：板岩 + 巴西劈裂　；参考：《金属矿山》2017年08期

【摘要】：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。
[Abstract]:In order to study the Brazilian splitting anisotropy of layered rock mass, the numerical simulation of particle flow is carried out, and the 胃 angle is defined as the angle between loading direction and normal direction of stratification. The results show that the tensile strength of slate decreases nonlinearly with the increase of 胃, and the decreasing rate of slate decreases gradually. The maximum and minimum values of tensile strength of slate are at 0 掳and 90 掳, respectively. With the increase of the number of cracks in the direction of 胃, the controlling effect of the plane on the failure of slate is gradually strengthened. The distribution of the number of cracks of class .4 reflects the mechanism of tensile and shear failure of slate and the gradual process of controlling the failure mode and tensile strength of slate at the same time. The particle flow simulates the process of slate failure. The crack sprouted from the nearest plane to the loading point, generated disorderly at the plane and reached the maximum load at the same time, and then extended diagonally downwards through the plane. And continue to cross the lower plane to form a macro crack.
【作者单位】：武汉理工大学资源与环境工程学院;矿物资源加工与环境湖北省重点实验室;武汉理工大学图书馆;
【基金】：湖北省自然科学基金青年基金项目(编号:2016CFB336) 中央高校基本科研业务费专项(编号:2017IVA045,2017IVA046)
【分类号】：TD315

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