【摘要】 卸荷状态下围岩的破坏机制比较复杂,受到多种因素影响,与传统的加载模式有本质区别。以锦屏地区板岩为研究对象,进行岩石力学性质试验和细观结构试验,研究卸荷后板岩力学性质变化和微裂纹细观结构参数的统计规律。通过采用Monte Carlo模拟,形象地再现了卸荷后板岩微裂隙的空间分布,最后得到不同围压、不同阶段卸荷破坏的岩石细观损伤的分形维数。将卸荷岩体的力学性质参数和细观损伤分形维数联系起来,为从传统力学方法研究岩石的损伤和破坏过程提供依据。研究结果表明,随着围压增大,卸荷岩体分形维数增大,相同围压下的岩体,峰后卸围压的分形维数大于峰前卸围压的分形维数。更多还原

【Abstract】 An essential distinction existed between unloading confining pressure and loading rock.Many factors affect on damage mechanism of unloading confining pressure rock.Taking slate in Jinping area as object of study,mechanical property and mesostructure parameter are achieved.The microcrack distribution on engineering rock is reappearance by means of the Monte-Carlo stochastic simulation.Then,the fractal dimension of unloading confining pressure rock under different confining pressures and different stages are obtained.It is a theory and reference for analyzing the microscopic changes of inner medium by means of conventional mechanics method.In conclusion:the fractal dimension of unloading confining pressure rock is magnification with confining pressure.Under the same confining pressure,the fractal dimension of post-peak is larger.更多还原