Abstract：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.
 BEAR J. Dynamics of fluids in porous media[M]. New York: American Elsevier, 1972.  ODA M. Method for evaluating the representative elementary volume based on a joint survey of rock masses[J]. Canadian Geotechnical Journal, 1988,25(3):440-447.  WANG M, KULATILAKE P H S. Estimation of REV size and three-dimensional hydraulic conductivity tensor for a fractured rockmass through a single well packer test and discrete fracture fluid flow modeling[J]. Int J Rock Mech Min Sci, 2002,39(7):887-904.  卢 波,(葛修润),(朱东林),等. 节理岩体表征单元体的分形几何研究[J]. (岩石力学与工程学报), 2005,24(8):1355-1361. (LU Bo, GE Xiu-run, ZHU Dong-lin, et al. Fractal study on the representative elementary volume of jointed rock masses[J]. Chinese Journal of Rock Mechanics and Engineering,2005,24(8): 1355-1361. (in Chinese)  周创兵),(陈益峰),(姜清辉). 岩体表征单元体与岩体力学参数[J]. (岩土工程学报), 2007,29(8):1135-1142. (ZHOU Chuang-bing, CHEN Yi-feng, JIANG Qing-hui. Representative elementary volume and mechanical parameters of fractured rock masses[J]. Chinese Journal of Geotechnical Engineering, 2007, 29(8): 1135-1142.( (in Chinese))  唐辉明),(张宜虎),(孙云志). 岩体等效变形参数研究[J]. 地球科学: 中国地质大学学报, 2007,32(3):389-396. (TANG Hui-ming, ZHANG Yi-hu, SUN Yun-zhi. A study of equivalent deformability parameters in rock masses[J]. Earth Science-Journal of China University of Geosciences, 2007, 32(3): 389-396.( (in Chinese))  宁 宇,(徐卫亚),(郑文棠),等. 柱状节理岩体随机模拟及其表征单元体尺度研究[J]. (岩石力学与工程学报), 2008,27(6):1202-1208. (NING Yu, XU Wei-ya, ZHENG Wen-tang, et al. Study of random simulation of columnar jointed rock mass ans its representative elementary volume scale[J]. Chinese Journal of Rock Mechanics and Engineering,2008,27(6): 1202-1208. (in Chinese)  夏 露,(刘晓非),(于青春). 基于块体化程度确定裂隙岩体表征单元体[J]. 岩 土 力 学, 2010,31(12):3991-3997. (XIA Lu, LIU Xiao-fei, YU Qing-chun. Determining representative elementary volume of fractured rock mass based on blockiness analysis[J]. Rock and Soil Mechanics, 2010, 31(12): 3991-3997.( (in Chinese))  杨建平),(陈卫忠),(戴永浩). 裂隙岩体变形模量尺寸效应研究I: 有限元法[J]. (岩土力学), 2011,32(5):1538-1545. (YANG Jian-ping, CHEN Wei-zhong, DAI Yong-hao. Study of scale effect of deformation modulus of fractured rock masspart I: Finite element method [J]. Rock and Soil Mechanics, 2011, 32(5): 1538-1545.( (in Chinese))  张莉丽),张 辛,王 云,等. 非常低延展性裂隙岩体REV存在性研究[J]. (水文地质工程地质), 2011,38(5):20-25. (ZHANG Li-li, ZHANG Xin, WANG Yun, et al. Determining of the REV for fracture rock mass of very low ductility[J]. Hydrogeology and Engineering Geology,2011,38(5): 20-25. (in Chinese)  马超锋),李 晓,(介玉新),等 围压对节理岩体表征单元体尺寸的影响研究[J]. 岩石力学与工程学报,2011, 30(增刊2): 3928-3936. (MA Chao-feng, LI Xiao, JIE Yu-xin. et al Effect of confining pressure on representative elementary volume size of jointed rock mass[J]. Chinese Journal of Rock Mechanics and Engineering,2011, 30(S2): 3928-3936. (in Chinese))  DI Sheng-jie, XU Wei-ya, NING Yu,et al. Macro- mechanical properties of columnar jointed basaltic rock masses[J]. Journal of Central South University of Technology, 2011,18(6):2143-2149.  WU Qiong,KULATILAKE P H S W. REV and its properties on fracture system and mechanical properties, and an orthotropic constitutive model for a jointed rock mass in a dam site in China[J]. Computers and Geotechnics, 2012,43(2012):124-142.  GRENON M, HADJIGEORGIOU J. Applications of fracture system models (FSM) in mining and civil rock engineering design[J]. International Journal of Mining Reclamation and Environment, 2012,26(1):55-73.  TANG C A. Numerical simulation of progressive rock failure and associated seismicity[J]. International Journal of Rock Mechanics and Mining Sciences. 1997, 34: 249-261.  ZHU W C, TANG C A. Micromechanical model for simulating the fracture process of rock[J]. Rock Mechanics and Rock Engineering, 2004,37(1):25-56.  蒲成志),曹 平,(赵延林),等. 单轴压缩下多裂隙类岩石材料强度试验与数值分析[J]. (岩土力学), 2010,31(11):3661-3666. (PU Cheng-zhi, CAO Ping, ZHAO Yan-lin, et al. Numerical analysis and strength experiment of rock - like materials with multi - fissures under uniaxial compression [J]. Rock and Soil Mechanics,2010,31(11): 3661-3666. (in Chinese)  李新平),(朱维申). 多裂隙岩体的损伤断裂模型及模型试验[J]. (岩土力学), 1991,12(2):5-14. (LI Xin-ping, ZHU Wei-shen. The damage fracture model for jointed rock mass and model tests[J]. Rock and Soil Mechanics, 1991, 12(2): 5-14.( (in Chinese))