岩石弹塑性破裂过程的数值模拟研究

STUDIES ON ELASTIC-PLASTIC FAILURE PROCESS ANALYSIS OF ROCK BY MEANS OF NUMERICAL SIMULATION

分析了对于非均质、非连续且材料参数分布具有分散性和随机性的岩体介质,采用传统有限元法解决其工程问题的局限性.阐述了用岩石力学性质的分布特性来描述岩石材料不均匀性,并用蒙特卡洛模拟方法,将符合Weibull分布规律的材料参数赋予岩体结构中的各个单元体,进而用计算机进行数值模拟的研究方法.应用了在Windows95环境下利用FORTRANPowerStation4.0平台开发的具有可视性的“岩石弹塑性破裂过程分析”软件——REPFPA软件,对典型的岩石试样和巷道模型的弹塑性破裂过程进行数值模拟研究,得到了有价值的实验结果.证明把材料参数随机赋值方法引入到岩土类材料的弹塑性破裂过程分析中去,并用计算机进行数值模拟是研究岩石弹塑性破裂过程的一种有效方法.

The thesis analyzes the limitations of the traditional FEM in solving engineering problems of the anisotropic and discontinuous rock-like materials with dispersing and random material parameters distribution, and sets forth the study method in which the anisotropy of rock-like material is described with mechanical properties distribution, and the material parameters conforming to Weibull distribution law are assigned to the cell in rock construction via. Monte Carlo simulation method, and then the numerical simulation is processed by computer. With the help of the software, REPFPA, which is of strong visibility and developed by the authors of this article, “Rock Elastic-Plastic Failure Process Analysis”, on the platform of FORTRAN Power Station 4.0 under MS Windows95, valuable experimental results are obtained by using the method in which the elasticplastic failure process of typical rock specimen and tunnel model are studied with numerical simulation. The method proves to be an effective one in the study of rock elastic-plastic failure process, in which the randomly assigned material parameters are introduced into rock-like materials elastic-plastic failure process analysis, and the numerical simulation is carried out by computer.