节理岩体表征单元体尺寸确定的数值模拟

从节理岩体表征单元体的力学意义出发，在通过对某物理试验结果进行模拟以验证RFPA程序模拟节理岩体强度及破裂模式具有适用性的基础上，提出一种基于RFPA数值模拟确定节理岩体表征单元体的方法。该方法基于蒙特卡洛法生成二维节理裂隙网格，实现节理裂隙的表征，将其导入岩石破裂过程分析软件中，分析节理岩体弹性模量和单轴抗压、抗拉强度的尺寸效应和各向异性，并据此确定了节理岩体的表征单元体尺寸。最后，针对某采场围岩节理面统计参数，分析讨论节理岩体的尺寸效应和各向异性，通过综合分析确定了节理岩体的弹性模量、抗压强度和抗拉强度等参数，并得出其表征单元体的尺度为6 m×6 m，这为后续的岩石力学研究奠定基础。

Numerical simulation for determining the size of representative element volume (REV) of jointed rock mass

According to the physical and mechanical significance of the representative element volume (REV) of jointed rock mass, based on the validation of rock failure process analysis (RFPA) software by simulating the strength and failure mode of the jointed rock mass synthesized in laboratory, a RFPA-based approach for determining the REV of the jointed rockmass is proposed. In this approach, a two-dimensional joint network is generated is represented based on the Monte-Carlo simulation of joint network. And then, the joint data are imported into the RFPA in order to study the size effect and anisotropy of the elastic moduli, the compressive strength and the tensile strength of the jointed rockmass, based on which the REV size is determined. At last, aiming at the jointed rock mass around a tunnel at a certain underground metal mine, the size effect and the anisotropy of the parameters of jointed rock mass are numerically examined. The REV size of the jointed rock mass is estimated to be 6 m×6 m after the comprehensive numerical analysis on the elastic moduli, compressive strength and tensile strength of the jointed rock at different spatial scales and orientations of joint, which may lay the basis for further geomechanical study analysis on jointed rock mass.