基于RFPA2D的岩石尺寸效应试验  

Size effect experiment of rock material with RFPA^(2D)

作　　者：陈鹏[1] 周志伟[2] 

机构地区：[1]辽宁工程技术大学学生管理处,辽宁阜新123000 [2]辽宁工程技术大学矿业学院,辽宁阜新123000

出　　处：《辽宁工程技术大学学报（自然科学版）》2012年第6期842-845,共4页Journal of Liaoning Technical University (Natural Science)

基　　金：国家自然科学基金资助项目(50774046),国家自然科学基金重点资助项目(50434020)

摘　　要：研究高径比不同变化趋势对岩石尺寸效应的影响,考虑到岩石材料的非均质性,应用岩石破裂过程分析系统RFPA2D,对不同变化趋势下的岩石样本,进行了单轴压缩下的数值模拟研究,并对数值模拟结果进行试验验证.结果表明:岩石的变形模量和弹性模量随高径比的增大而呈现非线性减小;在小高径比时岩石的破裂形式较复杂,在大高径比时,呈劈裂破坏和剪切破坏;岩石抗压强度随高径比的增大呈增大趋势.该成果对岩石尺寸效应有一定指导意义,便于为工程提供可靠岩石信息.In order to investigate the influence of height-diameter ratio on rock size effect,considering the heterogeneity of rock material,this study conducts a numerical modeling on different rock samples under uniaxial compression using the rock failure process analysis(RFPA2D) method,and verifies the numerical modeling results.The results show that the deformation modulus and elastic modulus decrease nonlinearly with the increase of height-diameter ratio.The rock compressive strength increases with the increase of height-diameter ratio.When height-diameter ratio is low,the rock fragmentation form is complex.Under a high height-diameter ratio,the rock damage exhibits a fracturing and shear failure.This result is of significance in rock size effect and rock engineering.

关 键 词：RFPA2D数值模拟 尺寸效应 岩石强度 高径比 破裂形式 弹性模量 泊松比 内摩擦角 

分 类 号：TD2[矿业工程—矿井建设]