ACOUSTIC EMISSION CHARACTERISTICS AND MECHANICAL BEHAVIOR OF SKARN UNDER UNAX1AL CYCLIC LOADING AND UNLOADING
Strength variation and acoustic emission characteristics of skarn under uniaxial cyclic loading and unloading tests are studied using MTS equipment and the PAC AE acquisition system. The results indicate that in the loading and unloading process, if there is no remarkably local failure occurring in the loading process, the unloading process might strengthen the rock sample with an increasing amplitude of 30％. If local failure occurs and non-renewable cracks appear in the loading process, the unloading process facilitates the slippage of planes of cracks and accelerates the breakdown rate. Meanwhile, the results also indicate that the uniaxial compression curve of skam can be generally divided into four stages pressure consolidation, elastic, plastic, and peak post which occurs with different acoustic emission conditions. There is an apparent relative quiet stage of acoustic emission signals before failure. In addition, skarn has the anti-Kaiser effect under cyclic loading and unloading with the felicity ratio decreasing and increasing in cycles Acoustic emission also exists in the unloading process with equal quantity and intensity to the loading process.
SU-CHAO XU XIA-TING FENG BING-RUI CHEN
School of Resources and Civil Engineering, Northeastern University Shenyang, 110004, P.R.China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechani
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
435-440
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）