【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。更多还原

【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.更多还原