摘要
籍助于断裂力学的理论和有限元数值计算方法，分析了压剪断裂过程中裂纹尖端应力场的演变规律；修正了应力强度因子的有关计算式，建立了表征初裂的新的断裂准则；反映了裂纹几何尺寸、分布规律、裂纹面物理力学性质、岩石材料断裂韧度，以及围压效应对岩石压剪断裂的影响．
Mixed mode fracture in rock subjected to compressive loading has many differ-ent features in fracture hehaviour from those subjected to tensile loading,especially when the aper-ture is partly or fully closed.The traditional theory of elastic fracttire mechanics can not be used tosolove compressive-shear fracture problem. Based on fracture characteristics of rock under compres-sion,the formulas to calculate stress intensity factor are updated so that the new strength criterion isevolved to evaluate the crack initiation streilgth.The stress distribution and the relative displacementof crack surface in central slit is confirmed by FEM analysis.
关键词
岩石
压剪断裂
力学
强度
rock,mixed mode fracture.fracture mechanics,stress intensity factor.
