干燥与饱水状态下砂岩的声发射特征研究  

Study on AE Characteristics of Sandstones Under Dry or Saturated Conditions

作　　者：邓飞[1] 张鑫[1] 罗福友[1] 王晓军[1] 尹丽冰 陶明[1] 

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州市341000

出　　处：《矿业研究与开发》2015年第2期73-78,共6页Mining Research and Development

基　　金：国家自然科学基金项目(51304083);上海市研究生创新专项资金项目(YC2013-S185)

摘　　要：针对干燥和饱和含水两种状态下的砂岩进行了单轴压缩破坏声发射测试与岩爆倾向性研究。结果表明:砂岩含水状态的不同,其加载过程都可分为Ⅰ、Ⅱ、Ⅲ3个阶段,但两者对应各阶段的时域分布有较大差异;每阶段,饱水试件振铃计数均数、峰值、总计数都比干燥试件小,饱水试件振铃计数随时间序列分布较稀疏,饱水试件峰值集中出现在极限应力附近,而干燥试件峰值分布相对较分散;两种含水状态试件第Ⅰ、Ⅱ阶段能量释放趋势一致,都较缓慢,能量释放主要集中在第Ⅲ阶段,不同的是,干燥试件的能量释放呈现出多个阶跃,而饱水试件的能量释放主要集中在破坏瞬间,干燥试件接收到的声发射累积能量为含水试件的10倍左右。结论:岩石中水分会影响岩石的变形特性,饱水岩石失稳前兆信息较少,岩爆倾向性更强。AE tests of uniaxial compression failure and studies on rock burst proneness were carried out on sandstones under dry and saturated conditions. The results showed that loading processes of sandstones under different conditions were all divided into three stages,but the time distribution of two states in each stage was varied. The average,peak and total ringing counts of saturated specimens were less than dry specimens,in a sparse distribution with time. The peaks of saturated specimens were concentrated near the ultimate stress while drying specimens distributed dispersedly. Under both conditions,the rock energy released slowly in the previous two stages,and mainly in the third stage. However,the energy release curve of dry specimens appeared multiple jumps,and saturated specimens' was focus on the failure moment. The AE accumulative energy of dry specimens was decuple higher than that of saturated specimens.Study results showed that the rock deformation was affected by water,and compared with dry rocks,saturated rocks had less foreboding information before deformation and stronger rock burst proneness.

关 键 词：声发射特征 砂岩 岩爆 含水率 

分 类 号：TD315[矿业工程—矿井建设]