岩石类试件损伤失稳时的位移特性分析  

Analysis on Displacement Characteristic of Rock Materials in Damage Instability

作　　者：王忠昶[1] 赵德深[1] 

机构地区：[1]大连大学辽宁省高校复杂结构体系灾害预测与防治重点实验室,辽宁大连市116622

出　　处：《矿业研究与开发》2009年第1期12-15,24,共5页Mining Research and Development

基　　金：国家自然基金资助项目(50574016);辽宁省教育厅基金资助项目(2008Z030)

摘　　要：通过对平面应变条件下不同损伤程度时试样变形过程中的应力位移变化值进行监测,分析了试样分叉与剪切带形成过程中轴向应力位移曲线,轴向-侧向位移对比曲线,剪切带网络特征及其随损伤程度变化的规律。研究表明,加载初期,围压存在时,试样首先表现为短暂的侧向压缩,随后开始发生侧向膨胀,损伤发生于材料达到峰值强度后,损伤程度越大,试样的残余强度与达到残余强度时的轴向位移越小,试样达到分叉点和剪切带形成点处的轴向位移越小,试样越容易发生失稳,剪切带网络开始于应力-位移曲线的弹性II阶段,发展于软化下降阶段,而形成于残余强度阶段。Based on the stress and displacement measures of rock materials with different degree of damage during deformation under plane strain condition,this paper analyzes the characteristics of rock samples axial stress-displacement curves,axial-lateral displacements comparing curves and their bifurcation,network in shear zones and their changes with degree of damage.It is shown that the deformation of transient lateral compression begun at the begin of loading when there was confining pressure,then the deformati...

关 键 词：分叉 损伤 应变软化 位移特征 

分 类 号：TU452[建筑科学—岩土工程]