峰后岩石类材料的声发射特性研究  

Study on After Peak Acoustic Emission Features of Rock Type Material

作　　者：唐珺[1] 刘卫群[1] 费晓东[1] 

机构地区：[1]中国矿业大学力学与建筑工程学院,江苏徐州221008

出　　处：《煤炭科学技术》2011年第5期21-24,共4页Coal Science and Technology

基　　金：国家自然科学基金资助项目(50774083;41074040);国家重点基础研究发展规划(973计划)资助项目(2009CB219605);教育部"新世纪优秀人才支持计划"资助项目(NCET-07-0803)

摘　　要：基于声发射试验系统和岩石声发射理论,对2种不同性质的岩石和水泥砂浆进行了单轴压缩试验,得到了3种试样破坏全过程的力学特性曲线、声发射振铃数和累计振铃数曲线,针对其变形特征及应力、振铃数与时间的关系分阶段进行了研究。研究表明:岩石类材料声发射受岩石强度、节理裂隙和晶粒软硬大小等的影响;部分质软岩石类材料在弹性、弹塑性阶段,其单位时间声发射振铃数逐步增加,但在接近强度峰值时出现声发射相对平静现象;峰后声发射活性主要受岩石的强度影响。对比不同岩石的破坏声发射特性,可为天然和人工岩土工程稳定性评估提供参数。Based on the acoustic emission test system and the rock acoustic emission theory,the uniaxial compressive tests were made on two different property rock and cement-sand grouts.The mechanics feature curve,the acoustic emission ringing numbers and the acoustic emission accumulated ringing number curve of full three sample failures＇ processes were obtained.A study in sections on the relationship between the deformation features and stress as well as the ringing number and time was conducted.The study showed that the acoustic emission of the rock type material would be affected by the rock strength,joint fissure and crystal grain hardness.The acoustic emission ringing number of the partial soft rock material at the elasticity and the elastic-plastic stage would be steadily increased in unit time and but when the rock material was near the peak strength,the acoustic emission occurred would be in a relative quiet phenomenon.The activity of the after peak acoustic emission would be mainly affected by the rock strength.The comparison on the acoustic emission features of the different rock failures could provide referen to evealuate the stability of natural and artificial rock projects.

关 键 词：岩石类材料 相对平静时期 声发射 岩土工程 

分 类 号：TD315.1[矿业工程—矿井建设]