基于单弱面理论对板岩巴西劈裂试验研究

为了揭示板岩这种层状岩体抗拉强度的各向异性，笔者根据层状岩体巴西劈裂试验圆盘平面应力的弹性力学解析解，并结合单弱面理论，建立了不同层理角度θ与抗拉强度的关系式。通过对不同层理角度θ下的试件进行巴西劈裂试验，得到：随着θ从0°变化至90°，强度因子呈现两端大中间小的趋势；运用单弱面理论得到的强度关系式可以较好地反映出在含有层理面时巴西劈裂试验抗拉强度随层理角度变化的规律；当0°≤θ＜25.2°或72.6°＜θ≤90°时，属于纯拉伸破坏；当25.2°≤θ≤72.6°时，岩块受层理面影响，属于沿层理面剪切破坏。

Study on Brazilian splitting test for slate based on single weak plane theory

The slate and other layered rock often have a variety of structural surfaces，and the tensile strength of the rock mass shows a substantial difference under different inclination levels.To reveal the slate tensile strength anisotropy，authors established an equation for different bedding angle and strength based on the plane stress of analytical solution of the elastic mechanics for disc on Brazilian splitting test and single surface theory.According to the results of Brazilian splitting test，it concludes that：With the change of θ from 0° to 90°，the trend of strength factor reaches its maximum value in the middle and its minimum value at two sides；The single weak plane theory can sufficiently describe the relationship between tensile strength and bedding angle；It is purely tensile failure when the bedding angle is 0°≤θ＜25.2° or 72.6°＜θ≤90°，and shear failure when the bedding angle is 25.2°≤θ≤72.6°.