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)
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.
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))
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2011, Vol. 30 
