【摘要】 在爆炸荷载作用下,岩体裂纹扩展速度的实测值与理论分析值之间存在较大差异。采用当前的动态断裂理论尚不能定性和定量地解释实测值与理论值之间的差异。运用分形理论分析了造成这种差异的原因,讨论了裂纹扩展过程中的分形效应、裂纹的分形扩展对裂纹扩展速度以及动态应力强度因子的影响。更多还原

【Abstract】 There is a big difference between the experimental data and the theoretical result of crack spreading in rock under explosion load. And the difference can not be explained qualitatively and quantitatively by the present dynamic fracture theory. Based on fractal theory, this paper analyses the fractal effect during the process of crack propagation and discusses the influence of fractal spreading on propagation velocity and on stress dynamic intensity factor of rock cracks. The reasons of the difference between the experimental data and the theoretical result of crack spreading in rock under explosion load are also explained satisfactorily in this paper.更多还原