一、经典的格里费斯理论 格里费斯(Griffith. A.A)在1924年导出了二维应力状态下脆性材料的破裂准则。他认为脆性材料的强度主要由材料内部裂痕的周边应力集中来控制。这些裂痕就是岩石中大量方向杂乱的、以颗粒边界形式存在的、潜在的破坏带。格里费斯将内部裂痕视为扁平的椭园,且忽略相邻裂痕之间的影响。当椭园端部的拉应力值大于该处的抗拉强度就导致在该处发生破裂。 First, the classic Griffiths theory Griffith (A.A.) in 1924 derived two-dimensional stress state brittle fracture criterion. He believes that the strength of brittle materials is mainly controlled by the stress concentration around the cracks in the material. These cracks are a lot of directions in the rock clutter, in the form of grain boundary exists, the potential damage zone. Griffith sees the internal rift as a flat oval and ignores the influence between adjacent rifts. When the value of the tensile stress of the end of the elliptical is greater than the tensile strength there, the rupture occurs.