Study of Deformation-Damage and Acoustic Emission Character of Coalrock Under Compression
Coalrock is a homogeneous medium. Under external loads, the microdefect nucleation, propagation and their interaction decide macroscopic deformation and damage character of coalrock. In order to study coalrock deformation and damage character under load and further reveal evolutionary process and the time effect mechanism of coalrock dynamic disaster, damage deformation and acoustic emission character of coalrock under compression was studied. A new damage variable which is defined based on normalized cumulative ring-down counts of acoustic emission is used to study deformation and damage character of coalrock. Damage evolution equation and damage constitutive model of coalrock under uniaxial compression are obtained. The results show that: acoustic emission of coalrock can demonstrate the deformation and damage evolution character; the new damage variable which is defined based on normalized cumulative ring-down counts of acoustic emission is reasonable; the deformation and damage evolution process can be divided into three departs including the stage of initial damage, the stage of damage stable evolution and development, the stage of damage accelerating development. The progress of coalrock deformation and damage can be regarded as a gradual development progress, which is the whole process from deformation and damages initiation and evolution to the appearance of macroscopic cracks, from macroscopic propagation to damage.
deformation-damage coalrock acoustic emission damage variable
Liu Baoxian Xiong Deguo Zhao Baoyun Li Dongkai
Key Laboratory for the Exploitation of Southwestern Resources & the Environmental Disaster Control E Department of Resource and Material Engineering, Henan Polytechnic University, Jiaozuo 454010 School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, China
国际会议
The 3rd International Symposium on Modern Mining & Safety Technology Proceedings(第三届现代采矿与安全技术国际学术会议)
辽宁阜新
英文
808-812
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）