采矿与安全工程学报2015，Vol.32Issue(6)：923-928,935,7.DOI:10.13545/j.cnki.jmse.2015.06.009
不同加载速率下岩样损伤演化的声发射特征研究
Damage evolution law based on acoustic emission of sandy mudstone under different uniaxial loading rate
摘要
Abstract
To study the acoustic emission (AE) and damage evolution characteristics of sandy mud-stone rock samples, MTS-C64.106 and PCI-2 AE System were utilized for uniaxial compression and acoustic emission monitoring tests during the compression. The loading rate was applied between 1.0×10-5s-1 and 1.7×10-3s-1. The results show that the peak strength of rock sample increases with the in-crease of loading rate. The releasing form of AE energy changes from solitary earthquake type to swarm type along with the increasing of loading rate, and the peak AE energy increases greatly under higher loading rate. In contrast, the number of accumulated ringing counts decreases significantly. In addition, the damage variable conducted by accumulated ringing counts was derived to describe the rock damage evolution, then the rock constitutive equation was deduced. Compared with the observed stress-strain curves and the conducted curves based on Weibull distribution, the damage evolution process under uniaxial compression can be well reflected by the conducted constitutive equations, especially under the higher loading rate. The conclusions can provide some reference to rock deformation, damage evolution, precursor information identification, etc., under different loading rates.关键词
单轴加载/加速速率/本构方程/声发射/损伤演化/应力-应变Key words
uniaxial loading/loading rate/constitutive equation/acoustic emission/damage evolution/stress-strain分类
矿业与冶金引用本文复制引用
曹安业,井广成,窦林名,王桂峰,刘赛,王常彬,姚肖肖..不同加载速率下岩样损伤演化的声发射特征研究[J].采矿与安全工程学报,2015,32(6):923-928,935,7.基金项目
国家自然科学基金青年科学基金项目(51204165) （51204165）
江苏高校优势学科建设工程项目(SZBF2011-6-B35) （SZBF2011-6-B35）
国家"十二五"科技支撑计划项目(2012BAK04B06) （2012BAK04B06）
中央高校基本科研业务专项资金项目(2014XT01,2012BZB17) （2014XT01,2012BZB17）
高等学校博士学科点专项科研基金新教师类课题项目(20120095120019) （20120095120019）
