摘要
通过对砂岩进行单轴加载声发射试验,获取岩石破裂过程的应力-应变曲线和相关声发射参数,综合分析了累计事件数、事件率、能率、声发射率之间随时间的变化规律。试验表明在加载初期小裂隙密集发育,后期以大裂隙发育为主。事件率和累计事件数没有明显前兆信息,声发射率和能率有明显的异常前兆。声发射定位表明裂隙发育由端部向中部转变,且无"空白区"阶段。声发射前兆信号为该类工程岩体的稳定性评价提供重要的理论依据。
In order to analyze connections of stress‐strain diagram and AE parameter during rock failure process under uniaxial compression AE testing ,and at the same time ,make an analysis about synthesis variables such as accumulated AE events ,event rate ,energy rate ,AE rate versus time .Results indicate that little fracture forms at preliminary stage and larger fracture forms at final stage .Event rate and accumulated AE events have no manifest foreboding information ,but AE rate and energy rate are just the opposite .AE location suggests that fractures shift along time from end to central part without any phase of “blank space” .AE precursory signal is regarded as an important theory basis to estimate the stability of the rock mass .
出处
《中国矿业》
北大核心
2015年第6期147-150,共4页
China Mining Magazine
基金
国家自然科学基金项目资助(编号:51209188)
关键词
事件率
能率
声发射
声发射定位
event rate
energy rate, acoustic emission （AE）
AE location
