摘要
对砂岩试样单轴刚性加载试验整个过程中声发射信息分析表明:砂岩在加载变形破坏过程中根据声发射信号特征可划分为压密、弹性、稳定破裂、非稳定破裂和峰后情况五个阶段.通过对稳定破裂和非稳定破裂分界点对应的临界点处的应力和应变值与峰值应力及其对应的应变比值分析发现,大部分应变比在74%与78%之间;应力比则相对应变比具有较大的离散性,均值在73%左右.上述研究,增进了对岩石破裂过程中声发射现象的认识,为相应岩石脆性破坏导致的地质灾害分析提供了新的研究思路.
It was analyzed the AE accumulation counts and emission of sandstone brittle failure with loading by uniaxial. From the relationship of AE and rock compression process under loading,it is classified five different deformation stages according AE, which are the density stage, the elastic stage, crack stable growth stage, crack unsteady growth stage and the damage stage. Combining the rock uniaxial compression results,it is shown that the strain ratio between the AE mutation of critical state to peaking state has a val-ue range 74% and 78%,but the stress ratio has a larger discrete,which has a average value nearly to 73%. In this article,it is discussed the new method to analysis of instability for rock brittle failure based on AE.
出处
《固体力学学报》
CAS
CSCD
北大核心
2012年第5期541-547,共7页
Chinese Journal of Solid Mechanics
基金
国家自然科学基金项目(41102201)
中央高校基本科研业务费专项资金(2010QNA54)
江苏高校优势学科建设工程项目资助
关键词
声发射
应力应变曲线
稳定破裂
非稳定破裂
AE, stress-strain curve, crack stable growth stage, crack unsteady growth
