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中文摘要：
在分析压剪复合型裂纹尖端应力场的基础上，利用最小J2准则得到压剪裂纹的起裂角。把岩石压剪断裂问题与岩石的破坏准则联系在一起，利用岩土材料中广泛应用的Mohr-Coulumb准则和Drucker-Prager准则分别建立两个岩石压剪断裂判据。计算结果表明，基于强度准则建立的岩石压剪断裂判据比较合理；纯Ⅱ型裂纹的断裂韧度与纯Ⅰ型裂纹的断裂韧度的比值与泊松比和内摩擦角的取值有关系（纯Ⅱ型裂纹的起裂角是某个定值时），而与其他岩石力学参数没有关系。
英文摘要：
Based on the analysis of the tip stress field of the compression-shear mixed-mode crack, the initial angle of compression-shear mixed-mode crack is deduced according to the minimum J2 criterion. By considering the rock compression-shear mixed-mode fracture and the rock yield criterion together, two fracture criteria of the rock compression-shear mixed-mode crack are obtained by use of Mohr-Coulumb and Drucker-Prager yield criteria which are adopted widely used in geotechnical materials. The calculation results show that the fracture criteria of the rock compression-shear mixed-mode crack based on the strength criteria are rational; and that the ratio between the fracture toughness of pure type Ⅱ crack and pure type Ⅰ crack is related with the Poisson＇s ratio and the inner friction angle of the rock when the initial angle of the pure type Ⅱ crack is a fixed value, instead of other rock mechanical parameters.
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