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[1]崔力,张民波,王金宝,等.不同围压下煤岩损伤变形规律及声发射特征分析[J].中国安全生产科学技术,2019,15(10):18-24.[doi:10.11731/j.issn.1673-193x.2019.10.003]
 CUI Li,ZHANG Minbo,WANG Jinbao,et al.Analysis on damage deformation laws and acoustic emission characteristics of coal rock under different confining pressures[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2019,15(10):18-24.[doi:10.11731/j.issn.1673-193x.2019.10.003]
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不同围压下煤岩损伤变形规律及声发射特征分析
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
15
期数:
2019年10期
页码:
18-24
栏目:
学术论著
出版日期:
2019-10-31

文章信息/Info

Title:
Analysis on damage deformation laws and acoustic emission characteristics of coal rock under different confining pressures
文章编号:
1673-193X(2019)-10-0018-07
作者:
崔力张民波王金宝王翠灵杜金磊
(1.武汉工程大学 兴发矿业学院,湖北 武汉 430074;
2.冀中能源集团有限责任公司,河北 邢台 054000;
3.湖北华中电力科技开发有限责任公司,湖北 武汉 430077)
Author(s):
CUI Li ZHANG Minbo WANG Jinbao WANG Cuiling DU Jinlei
(1.Xingfa School of Mining Engineering,Wuhan Institute of Technology,Wuhan Hubei 430074,China;
2.Jizhong Energy Group Co.,Ltd.,Xingtai Hebei 054000,China;
3.Hubei Huazhong Power Technology Development Co.,Ltd.,Wuhan Hubei 430077,China)
关键词:
不同围压损伤变形声发射应力应变AE计数
Keywords:
different confining pressures damage deformation acoustic emission stressstrain AE count
分类号:
X936
DOI:
10.11731/j.issn.1673-193x.2019.10.003
文献标志码:
A
摘要:
为研究不同围压条件下煤岩的损伤变形,利用RTX-1000岩石三轴仪和Micro-Ⅱ声发射成像采集仪对煤样进行不同围压下的三轴压缩声发射定位试验,对加载过程中的应力应变、AE计数等特征参数进行对比分析,构建基于AE计数的损伤模型,研究三轴压缩下煤岩损伤变形的规律。研究结果表明:在保持应变率恒定的条件下,围压越高,煤样的峰值强度越大,分别为18.04,29.92,32.29,45.94 MPa;围压越高,弹性阶段的AE计数相对减少;煤样发生剪胀扩容变形;基于AE计数构建损伤模型,分析对比损伤应变理论曲线与试验曲线,得到较高的拟合度,且损伤临界值和损伤量随围压的升高呈现减小的趋势;分析理论模型中的速率增长因子,得到试验与理论损伤规律一致。
Abstract:
In order to study the damage deformation of coal rock under different confining pressure conditions,the triaxial compression acoustic emission location tests under different confining pressures were carried out on the coal samples by using the RX-1 000 rock triaxial apparatus and Micro-Ⅱ acoustic emission imaging acquisition instrument.The characteristic parameters such as the stressstrain and AE count in the loading process were compared and analyzed,and a damage model based on AE count was constructed to study the damage deformation laws of coal rock under the triaxial compression.The results showed that under the condition of constant strain rate,the higher the confining pressure,the higher the peak strength of coal sample,which were 18.04,29.92,32.29 and 45.94 MPa respectively.The higher the confining pressure,the relatively less the AE count in the elastic stage.The coal samples occurred the shear dilatation,expansion and deformation.The damage model was constructed based on AE count,then the theoretical curve and experimental curve of damage strain were analyzed and compared,and the relatively high degree of fitness was obtained,furthermore,the critical value of damage and the amount of damage presented the decreasing trend with the increase of confining pressure.The rateincreasing factor in the theoretical model was analyzed,and the experimental and theoretical damage laws were consistent.

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备注/Memo

备注/Memo:
收稿日期: 2019-06-11;数字出版日期: 2019-10-26
* 基金项目: 河北省博士后创新项目(B2019005005);湖北省教育厅科学技术研究计划青年人才项目(Q20171508);武汉工程大学青年科学基金项目(K201855)
作者简介: 崔力,硕士研究生,主要研究方向为安全技术及工程。
通信作者: 张民波,博士,副教授,主要研究方向为煤矿瓦斯防治理论与技术。
更新日期/Last Update: 2019-11-05