岩石单轴压缩端部效应对受力状态的影响  

Influence of the End Effect of Rock Uniaxial Compression to Stress State

作　　者：王玉凯[1] 杨捷[1] 匡汉 庞博[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院

出　　处：《现代矿业》2015年第12期117-120,共4页Modern Mining

基　　金："十一五"国家科技支撑计划项目(编号:2009BAB48B02)

摘　　要：为研究单轴压缩试验中端部效应对试件内部受力状态的影响,以新阳煤矿山西组中粒砂岩为例,基于广义胡克定律,分别推导了有无端部效应2种情况下试件内部单元体的受力状态。基于FLAC3D数值模拟软件,通过改变接触面参数,分析了端部效应对岩石试件受力状态的影响。研究表明:1端面效应使试件端部侧向应力从无到有,试件中心应力最大,离中心越远,应力越小,试件边缘处应力最小;2端面效应使试件端部侧向应变减小,试件中心应变最小,离中心越远,应变越大,试件边缘处应变最大;3侧向应力应变的变化规律使轴截面的等值线基本呈三角形分布。In order to study the influence of end effect to the internal stress states of specimen in uniaxial compression test,taking the medium grained sandstone of Shanxi formation as the study example,based on the generalized Hooke law,the stress state of the unites of the test specimens under the end effect and without the end effect are derived respectively. Based on the numerical simulation software of FLAC3 D,the influence of the end effect to the stress state of the rock test specimen is analyzed in depth by changing the contact surface parameters. The research results show that： 1 the lateral stress is increased from zero under the action of the end effect,the maximum stress value of the center of the test specimen is obtained,the farther from the center of the test specimen,the smaller the stress value is acquired,minimum stress value at the edge of the test specimen is obtained; 2 the lateral strain is decreased under the action of the end effect,the minimum strain value is obtained at the center of the test specimen,the farther from the center,the larger the strain value is acquired,the maximum strain value is get at the edge of the test specimen; 3the triangular distribution in the axial section present is made by the change regularity of the lateral stress and strain make the contour lines in the axial section.

关 键 词：单轴压缩 端部效应 受力状态 广义胡克定律 数值模拟 应力 应变 

分 类 号：TD313[矿业工程—矿井建设]