含分形特征夹层岩体损伤与断裂过程的数值模拟  

Numerical simulation on process of damage and fracture of rock mass with fractal characteristic interlayers

作　　者：韩凤山[1] 

机构地区：[1]大连大学材料破坏力学数值试验研究中心,辽宁大连116622

出　　处：《计算机辅助工程》2011年第3期64-67,共4页Computer Aided Engineering

摘　　要：针对很难用解析方法描述和分析含分形特征夹层岩体裂纹的萌生、扩展和相互作用全过程的问题,基于岩石破裂过程分析系统RFPA2D,以大尺寸圆柱形砂岩试样为例,建立含天然分形特征夹层岩体的数值模拟模型,用统计强度理论Weibull分布描述试样天然分形特征夹层力学参数;通过设定夹层的节理粗糙度系数(Joint Roughness Coefficient,JRC)得到分形夹层的分形维数;通过RFPA2D数值模拟得到含分形特征夹层岩体的抗压强度.数值模拟结果表明,该方法可为探讨含分形特征夹层岩体的分形维数和抗压强度提供新思路,也为研究含分形特征夹层岩体在外载作用下岩体损伤和断裂的过程及其机理提供直观形象的分析方法.It is difficult to use analytical method to describe and analyze the whole process of progressive generation,propagation and interaction of cracks for rock mass with natural fractal characteristic interlayer.Based on rock failure process analysis system RFPA2D,a large-size cylindrical sample of sandstone is taken as an example,the numerical simulation model of rock mass with natural fractal characteristic interlayer is built,and the fractal characteristic interlayer mechanical parameters of the sample are described by statistical strength theory Weibull distribution;fractal dimension of interlayer is obtained by Joint Roughness Coefficient（JRC） of fractal interlayers;the compressive load of rock mass with natural fractal characteristic interlayers is obtained by numerical simulation of RFPA2D.The numerical simulation results show that the method provides new idea for fractal dimension and compressive strength of rock mass with fractal characteristic interlayers,and also provides an intuitive analysis method for the research of process and mechanism of damage and fracture of rock mass with fractal characteristic interlayers under external load.

关 键 词：岩体 损伤 断裂 分形特征夹层 分形维数 抗压强度 

分 类 号：TU45[建筑科学—岩土工程]