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本文用边界配置法计算了多种短四点剪切裂纹梁试件的ＫⅡ值及全场应力，并进行了相应的实验研究．理论计算与实验结果的综合分析表明，对于岩石剪切裂纹的张性开裂，不是仅由Ⅱ型裂纹尖端的奇异应力场所能决定的，而是与试件的完整应力场即非奇异应力场分布有很大关系．
In this paper, the boundary conditions are used to calculate the K Ⅱ values and the total field stresses for a variety of specimens with short four-point shear-crack beams. Corresponding experimental studies are also carried out. The comprehensive analysis of theoretical calculation and experimental results shows that the tensile cracking of rock shear cracks is not only determined by the singular stress field at the type Ⅱ crack tip but with the complete stress field, that is, the non-singular stress field distribution Have a great relationship.