【摘要】 对某水电站左岸边坡层状泥岩进行了强度试验研究,同时对裂纹垂直于层面及平行于层面这两种基本情形也进行了断裂试验研究。由于此层状岩体在强度方面表现出明显的正交各向异性,导致其在裂纹扩展方面表现出明显的特殊性,如I型及I-II复合型裂纹的剪切起裂扩展,锯齿状的裂纹扩展路径等等。此外,通过断裂力学及有限元方法对破坏机制进行了论证分析。由计算所得的KI和KII数值解,得到了裂纹垂直于层面时此泥板岩的临界断裂曲线。通过试验及理论探讨,为裂纹与层面斜交这一工程普遍情形的分析提供了基础,所得相关结论及临界断裂曲线也可为层状岩体边坡工程的结构面相关参数取值提供依据。更多还原

【Abstract】 The strength experimental investigations on layered mud rock mass have been conducted.For the two basic situations where the crack is vertical to layered rock mass and parallel to layers,the experimental studies on crack fracture initiation in the layered rock mass have been carried out.Due to the obvious orthogonal aeolotropy in strength,the layered rock mass displays obvious particularities in crack fracture initiation,for example,the shear expanding in pure model I and mixed model I–II crack tips,winding propagation routes.In addition,the fracture mechanism has been analyzed using fracture mechanics and finite element method.The critical fracture curve when cracks are vertical to the layered rock mass has also been obtained by using numerical values KI and KII.The experimental research and the theoretical discussion may provide a foundation for the usual situation analysis when cracks are inclined to layered rock mass.The results and the critical fracture curve can provide references to layered rock mass slope projects.更多还原