[1]潘红宇,董晓刚,张天军,等.单轴压缩下松软煤样破裂损伤演化特性研究[J].西安科技大学学报,2018,(02):202-209.[doi:10.13800/j.cnki.xakjdxxb.2018.0205]
 PAN Hong-yu,DONG Xiao-gang,ZHANG Tian-jun,et al.Evolution characteristics of soft coal sample fracture damage under uniaxial compression[J].Journal of Xi'an University of Science and Technology,2018,(02):202-209.[doi:10.13800/j.cnki.xakjdxxb.2018.0205]
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单轴压缩下松软煤样破裂损伤演化特性研究(/HTML)
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西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

卷:
期数:
2018年02期
页码:
202-209
栏目:
出版日期:
2018-03-15

文章信息/Info

Title:
Evolution characteristics of soft coal sample fracture damage under uniaxial compression
文章编号:
1672-9315(2018)02-0202-08
作者:
潘红宇13董晓刚13张天军23张 磊13
1.西安科技大学 安全科学与工程学院,陕西 西安 710054; 2.西安科技大学 理学院,陕西 西安 710054; 3.西安科技大学 西部矿井开采及灾害防治教育部重点实验室,陕西 西安 710054
Author(s):
PAN Hong-yu13DONG Xiao-gang13ZHANG Tian-jun23ZHANG Lei13
(1.College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.College of Sciences,Xi'an University of Science and Technology,Xi'an 710054,China; 3.Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi'an University of Science and Technology,Xi'an 710054,China)
关键词:
安全科学与工程 煤岩体裂隙演化 声发射 损伤变量 散斑数
Keywords:
safety science and engineering coal and rock mass fissure evolution acoustic emission damage variable speckle points
分类号:
TU 45
DOI:
10.13800/j.cnki.xakjdxxb.2018.0205
文献标志码:
A
摘要:
为定量分析松软煤样在压缩过程中的破裂损伤演化特性,对自制正方体松软型煤进行单轴压缩试验,利用无损监测装置——声发射检测系统采集煤样内部损伤的声发射信号,使用非接触式全场应变测量系统采集煤样表面的数字散斑图像,讨论了单轴压缩下煤样的声发射振铃计数、能量与加载过程的对应关系,对比分析了有无预制钻孔煤样的声发射特征,运用数字图像相关方法统计了煤样表面散斑点数,提出了用以表征煤样内部损伤的以累计振铃计数为基准的振铃损伤变量,用以表征煤样表面损伤的以散斑数为基准的散斑损伤变量,获得了煤样损伤变量曲线。研究表明,无预制钻孔煤样声发射活动更加剧烈,能量幅度更高,钻孔的存在破坏了煤样的整体性,降低了煤样强度; 声发射参数曲线与散斑数曲线均与煤样的加载曲线存在着分段对应的关系; 振铃损伤变量曲线和散斑损伤变量曲线均可表示煤样的损伤演化过程,煤样内部和表面的损伤特征相互印证,综合分析更能准确的表达煤样的损伤情况。
Abstract:
In order to quantitatively analyze the damage evolution characteristics of soft coal samples during compression,uniaxial compression of self-made soft cubic briquette samples was carried out.The acoustic emission signals of internal damage during coal loading were collected by non-destructive monitoring device-acoustic emission system.The non-contact strain measurement system collected the digital speckle images on the surface of coal sample.We discussed the ringing counting of acoustic emission and the correspondence between energy and loading curve under uniaxial compression,analyzed acoustic emission characteristics,and the number of speckle spots on the surface of the coal sample was calculated using the digital image correlation method,and the ringing damage variable based on the cumulative ring count for characterizing the internal damage of the coal sample was proposed for characterizing the surface of the coal sample damage,speckle damage variables based on speckle points were obtained,and the damage curves of coal samples under uniaxial compression were obtained.The results show that the acoustic emission of coal samples without pre-drilling is more intense and the energy amplitude is higher.The overall structure of the coal sample is damaged by the drilling and the strength of the coal sample is reduced.The curves of AE parameters and speckle pointshas corresponding relationship withthe curve of loading curve of coal sample in sections.The curve of ringing damage variable and the curve of speckle damage variable can all indicate the evolution of the damage of coal sample.The internal and surface damage characteristics of coal sample confirm each other and the comprehensive analysis is more accurate expression of coal-like damage situation.

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备注/Memo

备注/Memo:
收稿日期:2017-06-10 责任编辑:杨泉林
基金项目:国家自然科学基金(51374236,51474172,51374168); 国家自然科学基金(51327007)
通信作者:董晓刚(1991-),男,陕西宝鸡人,硕士研究生,E-mail:670040712@qq.com
更新日期/Last Update: 2018-03-31