岩石裂纹剪切加载破坏的非奇异应力场效应

Nonsingular stress distribution effects in rock crack propagation \=under shearing load

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．

The K Ⅱ and complete stress distribution for several kinds of four point bending specimens are calculated. Some experimental researches are carried out. The analyses indicate that, the tensile fracture for shearing crack of rock not only depends on the singular stress distribution but also on nonsingular distribution.