颗粒流细观强度参数与岩石断裂韧度之间的关系  

RELATION BETWEEN MESO-PARAMETERS OF PARTICLE FLOW CODE AND FRACTURE TOUGHNESS OF ROCK

作　　者：刘新荣[1,2,3] 傅晏[4] 郑颖人[3] 钟祖良[1,2] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 [3]后勤工程学院土木工程系,重庆400041 [4]重庆大学建设管理与房地产学院,重庆400045

出　　处：《岩石力学与工程学报》2011年第10期2084-2089,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家留学回国人员科研启动基金重点项目(教外司留[2002]247号);教育部"新世纪优秀人才支持计划"(NCET-05-0763);国家自然科学基金创新群体基金项目(50921063)

摘　　要：为研究岩石颗粒流分析模型中细观强度参数的物理意义,以接触黏结模型(CBM)中等效微梁的模型为基础,通过对2个黏结颗粒的拉伸和剪切状态进行分析,推导岩石颗粒流细观应力和断裂强度因子关系的理论公式,进而建立强度参数与岩石断裂韧度关系的理论模型。分析结果表明,岩石断裂韧度与细观强度呈线性关系。岩石颗粒最小粒径与颗粒半径比均对断裂强度因子有不利影响,且颗粒半径比的影响较大。以重庆地区砂岩为例,给出岩石断裂韧度与颗粒流细观强度之间的定量表达式,结果表明,岩石I型断裂韧度理论计算值范围与实测值较为相符。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.

关 键 词：岩石力学 细观强度参数 断裂韧度 颗粒流程序 接触黏结模型 

分 类 号：TU45[建筑科学—岩土工程]