循环载荷下煤样变形及声发射特征试验研究

doi:10.16265/j.cnki.issn1003-3033.2017.11.019

中国安全科学学报 ›› 2017, Vol. 27 ›› Issue (11): 109-115.doi: 10.16265/j.cnki.issn1003-3033.2017.11.019

循环载荷下煤样变形及声发射特征试验研究

郭军杰^1,2 副教授, 程晓阳^3,4

1 河南工程学院安全工程学院,河南郑州 451191
2 河南理工大学深井瓦斯抽采与围岩控制技术国家地方联合工程实验室,河南焦作 454000
3 瓦斯灾害监控与应急技术国家重点实验室,重庆 400037
4 中煤科工集团重庆研究院有限公司,重庆 400037

收稿日期:2017-08-20 修回日期:2017-10-15 发布日期:2020-10-21
作者简介:郭军杰 (1978—),男,河南唐河人,博士,副教授,主要从事瓦斯地质灾害防治和围岩失稳与控制方面的教学与科研工作。E-mail:gjjie@163.com。
基金资助:
深井瓦斯抽采与围岩控制技术国家地方联合工程实验室开放基金资助(G201615);2018年度河南省高等学校重点科研项目(18A440009)。

Experimental study on deformation and acoustic emission characteristics of coal samples under cyclic loading

GUO Junjie^1,2, CHENG Xiaoyang^3,4

1 Safety Engineering Department, Henan University of Engineering, Zhengzhou Henan 451191, China
2 State and Local Joint Engineering Laboratory for Gas Drainage & Ground Control of Deep Mines, Henan Polytechnic University, Jiaozuo Henan 454000, China
3 National Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China
4 China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400037, China

Received:2017-08-20 Revised:2017-10-15 Published:2020-10-21

摘要/Abstract

摘要： 为预防煤岩动力灾害,有必要研究煤样在疲劳破坏过程中应力水平对裂隙演化的影响。采用岩石力学试验机与全信息声发射信号分析仪组成的试验系统,研究不同应力水平循环作用下煤样的变形和声发射特征,并探讨声发射参量与裂隙演化的关系。结果表明:在等幅循环载荷下,煤样的变形过程有减速、匀速和加速3个阶段,滞回曲线呈现疏-密-疏的变化规律,并且滞回环的疏密程度及疲劳寿命与上限应力水平正相关;循环过程中煤样的声发射特征也表现出明显的阶段性,可分为降低、稳定和升高阶段,且应力水平越高,各阶段的声发射活动越剧烈;与声发射活动呈现的阶段性特征相对应,煤样裂隙演化过程可分为初始损伤、微裂纹稳定发展、裂纹贯通破坏阶段,并且随应力水平的增高,单次循环中煤样裂纹的萌生和扩展发育越快。

关键词: 煤样, 循环载荷, 裂隙演化, 声发射特征, 应力-应变特征

Abstract: The effect of the axial stress level on fracture evolution during the fatigue failure process of coal samples was studied using a test system consisting of a rock mechanics testing machine and a acoustic emission instrument. The results show that under cyclic loading, the deformation process of coal samples has a deceleration phase, an uniform phase and an acceleration phase, that there is a change of sparse-dense-sparse in the hysteresiscurves, that both the density of the hysteresis loop and the fatigue life are proportional to the stress level, that acoustic emission is characterized byobvious stages, that the higher the stress level is, the more intense the acoustic emission activity in each stage will be, that the fracture evolution process of coal sample is includes an initial damage stage, a stable stage of development of micro cracks and a crack failure stage, and that there is a positive correlation between both the crack initiation and propagation in a single cycle and the stress level.

Key words: coal, cyclic loading, fracture evolution, acoustic emission characteristics, stress-strain characteristics

中图分类号:

X936

郭军杰副教授, 程晓阳. 循环载荷下煤样变形及声发射特征试验研究[J]. 中国安全科学学报, 2017, 27(11): 109-115.

GUO Junjie, CHENG Xiaoyang. Experimental study on deformation and acoustic emission characteristics of coal samples under cyclic loading[J]. China Safety Science Journal, 2017, 27(11): 109-115.

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循环载荷下煤样变形及声发射特征试验研究

Experimental study on deformation and acoustic emission characteristics of coal samples under cyclic loading

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