摘要
利用多道声发射采集系统记录了不同岩性的岩石试件变形破坏过程中的AE全波形,由扫描算法求得试件变形全过程的声发射b值动态曲线.声发射b值在岩石加载前期和中期阶段b值总体呈上升趋势,上升过程中有不同程度和次数的起伏,到岩石接近破坏时,b值迅速降低.但是,声发射b值的下降并不一定代表岩石即将失稳破坏,仅依靠声发射频率和强度参数并不能完整准确地反演岩石内部结构,也不能实现对岩石失稳破坏的预测预报.岩体的动力失稳破坏的机理异常复杂,要实现准确的预测预报,应对声发射信号所包含的信息进一步挖掘,并对比分析其它岩石状态参数的变化规律.
The multi - channels acoustic emission acquiring system was employed to record the whole waves of the AE events in deformation and failure of rock specimens with different lithology. Dynamic curves of AE b - value were gained by the scan - calculating method. In the early and middle phase of loading, the AE b - val- ue generally showed ascending trend, and there were waves with different scales and times at accending stage. Finally, the b - value descended quickly when the specimen approached total failure. But the descending of b - value did not present the failure of rock, and only AE frequency and magnitude factors could not reflect the structure status inside rock accurately and forecast the rock dynamic disaster reliably. The mechanism of the rock dynamic failures is greatly complicated. For forecasting the rock failure more accurately, the information included in the AE signals need to be more excavated, and comprehensive analysis and investigation should be conducted with the factors of mechanical status.
出处
《河南理工大学学报（自然科学版）》
CAS
2010年第5期663-666,共4页
Journal of Henan Polytechnic University（Natural Science）
基金
国家自然科学基金资助项目(50974054)
教育部高等学校博士点学科专项科研基金资助项目(20070460001)
关键词
岩石失稳破裂
声发射
B值
rock failure
acoustic emission
b value
