A MICROSCOPIC BOND MODEL FOR ROCK AND PRELIMINARY STUDY OF NUMERICAL SIMULATION METHOD BY DISTINCT ELEMENT METHOD
JIANG Mingjing1，2，CHEN He1，2，LIU Fang1，2
(1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering，Ministry of Education，Tongji University，Shanghai 200092，China)
Abstract：Based on a series of microscopic mechanical tests on the bonded granules idealized by two glued aluminum rods，a microscopic bond contact model for rocks was proposed and implemented into a commercial distinct element code. The customized code was then used to simulate the uniaxial and biaxial compression tests，the direct tension test and the Brazilian test on rock. The numerical results were compared with available experimental data to verify the bond contact model. The results demonstrate that the distinct element method incorporated with the proposed model can capture the fundamental mechanical behaviors of rocks. The relationship curve between the bond broken number of bonds and the axial stress can be used to distinguish different stages of crack propagation and to predict the crack initiation stress，the crack damage stress and the peak stress.
蒋明镜1，2，陈 贺1，2，刘 芳1，2. 岩石微观胶结模型及离散元数值仿真方法初探[J]. 岩石力学与工程学报, 2013, 32(1): 15-23.
JIANG Mingjing1，2，CHEN He1，2，LIU Fang1，2. A MICROSCOPIC BOND MODEL FOR ROCK AND PRELIMINARY STUDY OF NUMERICAL SIMULATION METHOD BY DISTINCT ELEMENT METHOD. , 2013, 32(1): 15-23.
[1] 李 贺，尹光志，许 江，等. 岩石断裂力学[M]. 重庆：重庆大学出版社，1988：2–6.(LI He，YIN Guangzhi，XU Jiang，et al. Rock fracture mechanics[M]. Chongqing：Chongqing University Press，1988：2–6.(in Chinese))
[2] POTYONDY D O，CUNDALL P A，LEE C A. Modelling rock using bonded assemblies of circular particles[C]// AUBERRTIN M，HASSANI F，MITRI H. Proceedings of the 2nd North American Rock Mechanics Symposium. Quebec，Rotterdam：Balkema Press，1996：1 927–1 944.
[3] 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.
[4] FAKHIMI A. Application of slightly overlapped circular particles assembly in numerical simulation of rocks with high friction angles[J]. Engineering Geology，2004，74(1/2)：129–138.
[5] JERZY R，EUGENIOO，CARLOS L，et al. Discrete element simulation of rock cutting[J]. International Journal of Rock Mechanics and Mining Sciences，2011，48(6)：996–1 010.
[6] BUSAIDI A A，HAZZARD J F，YOUNG R P. Distinct element modeling of hydraulically fractured lac du bonnet granite[J]. Journal of Geophysical Research，2005，110(B06302)：1–14.
[7] 庄 宁. 裂隙岩体渗流应力耦合状态下裂纹扩展机制及其模型研究[博士学位论文][D]. 上海：同济大学，2002.(ZHUANG Ning. Propagation rule of crack rock mass and its mathematics model research under the seepage-stress coupling[Ph. D. Thesis][D]. Shanghai：Tongji University，2002.(in Chinese))
[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] CHRISTIAN E，ROBERT S，PETER E. A discrete element model to describe failure of strong rock in uniaxial compression[J]. Granular Matter，2011，13(4)：341–364.
[10] 贺续文，刘 忠，廖 彪，等. 基于离散元法的节理岩体边坡稳定性分析[J]. 岩土力学，2011，32(7)：2 199–2 203.(HE Xuwen，LIU Zhong，LIAO Biao，et al. Stability analysis of jointed rock slopes based on discrete element method[J]. Rock and Soil Mechanics，2011，32(7)：2 199–2 203.(in Chinese))
[11] JIANG M J，YU H S，HARRIS D. Bond rolling resistance and its effect on yielding of bonded granulates by DEM analyses[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2006，30(8)：723–761.
[12] JIANG M J，YU H S，LEROUEIL S. A simple and efficient approach to capturing bonding effect in naturally micro-structured sands by discrete element method[J]. International Journal for Numerical and Analytical Methods in Engineering，2007，69(6)：1 158–1 193.
[13] JIANG M J，SUN Y G，LI L Q，et al. Contact behavior of idealized granules bonded in different interparticle distances：an experimental investigation[J]. Mechanics and Materials，2012，55(1)：1–15.
[14] JIANG M J，SUN Y G，XIAO Y. An experimental investigation on the contact behavior between cemented granules[J]. Geotechnical and Testing Journal，2012，35(5)：678–690.
[15] 蒋明镜，孙渝刚，李立青. 胶结颗粒接触力学特性测试装置研制[J]. 岩土力学，2011，32(1)：309–315.(JIANG Mingjing，SUN Yugang，LI Liqing. Development of experimental apparatus for contact behavior of bonded granules[J]. Rock and Soil Mechanics，2011，32(1)：309–315.(in Chinese))
[16] 蒋明镜，孙渝刚，李立青. 复杂应力下两种胶结颗粒微观力学模型的试验研究[J]. 岩土工程学报，2011，33(3)：354–360.(JIANG Mingjing，SUN Yugang，LI Liqing. Experimental study on micro- mechanical model for two different bonded granules under complex stress conditions[J]. Chinese Journal of Geotechnical Engineering，2011，33(3)：354–360.(in Chinese))
[17] 蒋明镜，周雅萍，陈 贺. 不同胶结厚度粒间胶结微观模型参数试验研究[J]. 岩土力学，2013(待刊).(JIANG Mingjing，ZHOU Yaping，CHEN He. Experimental analyses of effect of different bond thickness on parameters in micro-mechanical model of bonded granules[J]. Rock and Soil Mechanics，2013(to be pressed).(in Chinese))
[18] JIANG M J，KONRAD J M，LEROUEIL S. An efficient technique for generating homogeneous specimens for DEM studies[J]. Computers and Geotechnics，2003，30(7)：579–597.
[19] MARTIN C D. The strength of massive Lac Du Bonnet granite around underground openings[Ph. D. Thesis][D]. Winnipeg：University of Manitoba，1993.
[20] MARTIN C D，CHANDLER N A. The progressive fracture of Lac du Bonnet granite[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1994，31(6)：643–659.
[21] TAPPONNIER P，BRACE W F. Development of stress-induced microcracks in Westerly granite[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1976，13(4)：103–112.
[22] BRACE W F，PAULDING B W，SCHOLZ C. Dilatancy in the fracture of crystalline rocks[J]. Journal of Geophysical Research，1966，71(16)：3 939–3 953.
[23] THORNTON C. Numerical simulation of deviatoric shear deformation of granular media[J]. Geotechnique，2000，50(1)：43–53.
[24] 杨圣奇. 裂隙岩石力学特性研究及时间效应分析[M]. 北京：科学出版社，2011：57–85.(YANG Shengqi. Analysis of fissure rock mechanical properties and time effects[M]. Beijing：Science Press，2011：57–85.(in Chinese))
2013, Vol. 32 
