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| RELATION BETWEEN MESO-PARAMETERS OF PARTICLE FLOW CODE AND FRACTURE TOUGHNESS OF ROCK |
| LIU Xinrong1，2，3，FU Yan4，ZHENG Yingren3，ZHONG Zuliang1，2 |
(1. College of Civil Engineering，Chongqing University，Chongqing 400045，China；2. Key Laboratory of New Technology for Construction of Cities in Mountain Area，Ministry of Education，Chongqing University，Chongqing 400045，China；3. Department of Civil Engineering，Logistical Engineering University of PLA，Chongqing 400041，China；4. College of Construction Management
and Real Estate，Chongqing University，Chongqing 400045，China) |
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Abstract To study the physical meaning of strength meso-parameters of particle flow code(PFC)，based on equivalent meso-beam of contact-bond model(CBM)，tensional and shear states of two particles are analyzed. Relation between meso-stress of particles and fracture strength factors are derived. Then theoretical model between strength meso-parameters of PFC and fracture toughness of rock is established. There is a linear relationship between strength meso-parameters and fracture toughness. Besides，minimum radius and radius ratio of particle，especially the latter，have adverse effects on fracture strength factors of rock. Taking the sandstone of Chongqing for example，quantified expression between fracture toughness of rock and meso-parameters of PFC is established. The range of KIC calculated by meso-parameter of PFC fit the experimental data.
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Received: 04 June 2011
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| [1] CUNDALL P A，STRACK O D L. A discrete numerical model for granular assemblies[J]. Geotechnique，1979，29(1)：47–65.
[2] 周 健，池 永，池毓蔚，等. 颗粒流方法及PFC2D程序[J]. 岩土力学，2000，21(3)：271–274.(ZHOU Jian，CHI Yong，CHI Yuwei，et al. Method of particle flow and PFC2D code[J]. Rock and Soil Mechanics，2000，21(3)：271–274.(in Chinese))
[3] 周 健，池毓蔚，池 永，等. 砂土双轴试验的颗粒流模拟[J]. 岩土工程学报，2000，22(6)：701–704.(ZHOU Jian，CHI Yuwei，CHI Yong，et al. Simulation of biaxial test on sand by particle flow code[J]. Chinese Journal of Geotechnical Engineering，2000，22(6)：701–704.(in Chinese))
[4] 周 健，池 永. 土的工程力学性质的颗粒流模拟[J]. 固体力学学报，2004，25(4)：377–382.(ZHOU Jian，CHI Yong. Simulating soil properties by particle flow code[J]. Acta Mechanica Solida Sinica，2004，25(4)：377–382.(in Chinese))
[5] ZHOU J，SU Y，CHI Y. Simulation of soil properties by particle flow code[J]. Chinese Journal of Geotechnical Engineering，2006，28(3)：390–396.
[6] 曾庆有，周 健. 不同墙体位移方式下被动土压力的颗粒流模拟[J]. 岩土力学，2005，26(增)：43–47.(ZENG Qingyou，ZHOU Jian. Analysis of passive earth pressure due to various wall movements by particle flow code[J]. Rock and Soil Mechanics，2005，26(Supp.)：43–47.(in Chinese))
[7] 吴顺川，张晓平，刘 洋. 基于颗粒元模拟的含软弱夹层类土质边坡变形破坏过程分析[J]. 岩土力学，2008，29(11)：2 899–2 904. (WU Shunchuan，ZHANG Xiaoping，LIU Yang. Analysis of failure process of similar soil slope with weak intercalated layer based on particle flow simulation[J]. Rock and Soil Mechanics，2008，29(11)：2 899–2 904.(in Chinese))
[8] 周 健，王家全，曾 远，等. 土坡稳定分析的颗粒流模拟[J]. 岩土力学，2009，30(1)：86–90.(ZHOU Jian，WANG Jiaquan，ZENG Yuan，et al. Simulation of slope stability analysis by particle flow code[J]. Rock and Soil Mechanics，2009，30(1)：86–90.(in Chinese))
[9] 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.
[10] 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.
[11] BACKSTROM A，ANTIKAINEN J，BACKERS T，et al. Numerical modeling of uniaxial compressive failure of granite with and without saline pore water[J]. International Journal of Rock Mechanics and Mining Sciences，2008，45(7)：1 126–1 142.
[12] HSIEH Y M，LI H H，HUANG T H，et al. Interpretations on how the macroscopic mechanical behavior of sandstone affected by microscopic properties-revealed by bonded-particle model[J]. Engineering Geology，2008，99(1/2)：1–10.
[13] 刘顺桂，刘海宁，王思敬. 断续节理直剪试验与PFC2D数值模拟分析[J]. 岩石力学与工程学报，2008，27(9)：1828–1836.(LIU Shungui，LIU Haining，WANG Sijing. Direct shear tests and PFC2D numerical simulation of intermittent joints[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(9)：1 828–1 836.(in Chinese))
[14] 尹小涛，葛修润，李春光，等. 加载速率对岩石材料力学行为的影响[J]. 岩石力学与工程学报，2010，29(增1)：2 610–2 615.(YIN Xiaotao，GE Xiurun，LI Chunguang，et al. Influences of loading rates on mechanical behaviors of rock materials[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(Supp.1)：2 610–2 615.(in Chinese))
[15] 尹小涛，葛修润，李春光，等. 基于数值实验的岩石试样最佳长径比研究[J]. 岩石力学与工程学报，2010，29(增2)：3 608–3 615. (YIN Xiaotao，GE Xiurun，LI Chunguang，et al. Study of optimal length-diameter ratio of rock specimen based on numerical tests[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(Supp.2)：3 608–3 615.(in Chinese))
[16] JEOUNGSEOK Y. Application of experimental design and optimization to PFC model calibration in uniaxial compression simulation[J]. International Journal of Rock Mechanics and Mining Sciences，2007，44(6)：871–889.
[17] LAWN B R，WILSHAW T R. 脆性固体断裂力学[M]. 陈 颙，尹详础译. 北京：地震出版社，1985：5–8.(LAWN B R，WILSHAW T R. Fracture of brittle solids[M]. Translated by CHEN Yong，YIN Xiangchu. Beijing：Earthquake Press，1985：5–8.(in Chinese))
[18] 傅 晏. 干湿循环水–岩相互作用下岩石劣化机制研究[博士学位论文][D]. 重庆：重庆大学，2010.(FU Yan. Study on water-rock interaction with the cyclic drying-wetting effect on rock[Ph. D. Thesis][D]. Chongqing：Chongqing University，2010.(in Chinese))
[19] 黄志鹏，朱可善，郭映忠. 重庆砂岩三点弯曲断裂及声发射试验研究[J]. 地下空间，1998，18(1)：23–26.(HUANG Zhipeng，ZHU Keshan，GUO Yingzhong. Experiments on three point bending rupture and acoustic emission of Chongqing sandstones[J]. Underground Space，1998，18(1)：23–26.(in Chinese))
[20] BACKERS T. Fracture toughness determination and micromechanics of rock under mode I and mode II loading[Ph. D. Thesis][D]. Potsdam，Germany：University of Potsdam，2005. |
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2011, Vol. 30 
