Abstract：The deformation and failure characteristics of brittle-ductile-plastic transition，which is shown in the post-peak stage for Jinping deep marble，was simulated by clumped-particle model(CPM) of particle flow code(PFC)，and studied from the micro view. After a long process of trial-and-error calibration of laboratory test results，a set of micro parameters for Jinping deep marble were obtained. It is shown that a series of macroscopic mechanical properties of the synthetic rock，including the elastic modulus，Poisson?s ratio，uniaxial compressive and crack initiation strengths，stress-strain curves，the peak and residual strength envelops，the ratio of tensile to uniaxial compressive strength，and the failure patterns of synthetic rock samples，all agree well with the test results of Jinping deep marble. Study of regularities of crack development in synthetic rock samples at different confining pressures indicates that：The significant difference of development features of microcracks at different confining pressures is the main reason which leads to Jinping deep marble appearing brittle-ductile-plastic transition character；and the development of large number of tension cracks determines the brittle failure pattern of medium，while the rapid growth of shear cracks prompts the failure patterns of medium transition from brittle to ductile or plastic.
[1] 刘 宁，张春生，褚卫江. 深埋大理岩破裂扩展时间效应的颗粒流模拟[J]. 岩石力学与工程学报，2011，30(10)：1 989–1 996.(LIU Ning，ZHANG Chunsheng，CHU Weijiang. Simulating time- dependent failure of deep marble with particle flow code[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(10)：1 989– 1 996.(in Chinese))
[2] HUDSON J A，HARRISON J P. Engineering rock mechanics：An introduction to the principles[M]. London：Elsevier Science Ltd.，2000：67.
[3] Itasca Consulting Group Inc.. PFC2D(particle flow code in 2D) theory and background[R]. Minnesota，USA：Itasca Consulting Group Inc.，2008.
[4] POTYONDY D O，CUNDALL P A. A bonded-particle model for rock[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(8)：1 329–1 364.
[5] DIEDERICH M S. Rock fracture and collapse under low confinement conditions[J]. Rock Mechanics and Rock Engineering，2003，36(5)：339–381.
[6] WANNE T S，YOUNG R P. Bonded-particle modeling of thermally fractured granite[J]. International Journal of Rock Mechanics and Mining Sciences，2008，45(5)：789–799.
[7] HAJIABDOLMAJID V，KAISER P K，MARTIN C D. Modelling brittle failure of rock[J]. International Journal of Rock Mechanics and Mining Sciences，2002，39(6)：731–741.
[8] CHO N，MARTIN C D，SEGO D C. A clumped particle model for rock[J]. International Journal of Rock Mechanics and Mining Sciences，2007，44(7)：997–1 010.
[9] POTYONDY D O. A Grain-Based model for rock：approaching the true microstructure[C]// Proceedings of Bergmekanikk i Norden 2010—Rock Mechanics in the Nordic Countries. Kongsberg：Norwegian Group for Rock Mechanics，2010：225–234.
[10] ZHANG Q，ZHU H H，ZHANG L Y，et al. Study of scale effect on intact rock strength using particle flow modeling[J]. International Journal of Rock Mechanics and Mining Sciences，2011，48(8)：1 320–1 328.
[11] IVARSA D M，PIERCEB M E，DARCEL C，et al. The synthetic rock mass approach for jointed rock mass modelling[J]. International Journal of Rock Mechanics and Mining Sciences，2011，48(2)：219–244.
[12] WANG C，TANNANT D D，LILLY P A. Numerical analysis of the stability of heavily jointed rock slopes using PFC2D[J]. International Journal of Rock Mechanics and Mining Sciences，2003，40(3)：415–424.
[13] SU O，AKCIN N A. Numerical simulation of rock cutting using the discrete element method[J]. International Journal of Rock Mechanics and Mining Sciences，2011，48(3)：434–442.
[14] 张春生，陈祥荣，侯 靖，等. 锦屏二级水电站深埋大理岩力学特性研究[J]. 岩石力学与工程学报，2010，29(10)：1 999–2 009. (ZHANG Chunsheng，CHEN Xiangrong，HOU Jing，et al. Study of mechanical behavior of deep marble at Jinping II hydropower station[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(10)：1 999–2 009.(in Chinese))
[15] MARTIN C D. Seventeenth Canadian geotechnical colloquium：the effect of cohesion loss and stress path on brittle rock strength[J]. Canadian Geotechnical Journal，1997，34(5)：698–725.
[16] 朱焕春. 锦屏二级水电站引水隧洞围岩稳定、动态支护设计及岩爆专题研究——沿线地应力和岩体力学特性阶段性成果报告[R]. 武汉：Itasca(武汉)咨询有限公司，2009.(ZHU Huanchun. Monographic research on surrounding rock stability，dynamic support design and rock burst control in diversion tunnels of Jinping II hydropower station—phase achievement reports of geostress along tunnel axis and rock mass mechanical characters[R]. Wuhan：Itasca(Wuhan) China Consulting Corporation，2009.(in Chinese))
[17] HOEK E，BROWN E T. Practical estimates of rock mass strength[J]. International Journal of Rock Mechanics and Mining Sciences，1997，34(8)：1 165–1 186.
[18] 尤明庆. 岩石试样的强度及变形破坏过程[M]. 北京：地质出版社，2000：86–112.(YOU Mingqing. Strength of rock specimen and its deformation and failure process[M]. Beijing：Geological Publishing House，2000：86–112.(in Chinese))
2013, Vol. 32 
