低围压煤样破裂过程次声波响应特征研究

doi:10.16265/j.cnki.issn1003-3033.2020.02.003

中国安全科学学报 ›› 2020, Vol. 30 ›› Issue (2): 14-20.doi: 10.16265/j.cnki.issn1003-3033.2020.02.003

低围压煤样破裂过程次声波响应特征研究

王云刚^1,2,3 教授, 邓万九^1,2, 张宏图^**1,2,3, 魏建平^1,2,3 教授, 徐彦茹^1,2

1.河南理工大学安全科学与工程学院,河南焦作 454000;
2.河南理工大学河南省瓦斯地质与瓦斯治理省部共建国家重点实验室培育基地,河南焦作 454000;
3.河南理工大学煤炭安全生产河南省协同创新中心,河南焦作454000

收稿日期:2019-11-28 修回日期:2020-01-14 出版日期:2020-02-28 发布日期:2021-01-25
通讯作者: **张宏图(1988—),男,河南遂平人,博士,讲师,从事瓦斯灾害防治方面的研究。E-mail:cctv1728@1126.com。
作者简介:王云刚(1978—),男,山西晋城人,博士,教授,主要从事瓦斯灾害防治和安全监测理论与技术研究工作。E-mail:wyg@hpu.edu.cn。
基金资助:
国家自然科学基金资助(51574112,U1704129);河南省基础与前沿技术研究计划项目(14230013211)。

Infrasonic wave response characteristics of coal samples in fracture process under low confining pressure

WANG Yungang^1,2,3, DENG Wanjiu^1,2, ZHANG Hongtu^1,2,3, WEI Jianping^1,2,3, XU Yanru^1,2

1. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454000, China;
2. State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo Henan 454000, China;
3. Coal Production Safety Collaborative Innovation Center in Henan Province, Jiaozuo Hehan 454000, China

Received:2019-11-28 Revised:2020-01-14 Online:2020-02-28 Published:2021-01-25

摘要/Abstract

摘要： 为实现次声波监测煤矿井下地质灾害,利用煤岩蠕变-渗流加载、声发射采集、次声波采集系统监测低围压煤样破裂失稳过程,对比分析围压缸内油体耦合的第1路次声波信号与围压缸外与空气耦合的第2路信号,第1路信号在破坏前响应特征明显,与应力-应变曲线、声发射信号一致性较好,弹性阶段前无明显变化,且优于第2路信号,塑性阶段后期信号异常,声压增大。研究结果表明:煤样破坏引起宽频带现象,频率较低信号强度较大,1 Hz处强度最大;可将异常次声波特征作为煤体破坏判定依据之一。

关键词: 低围压加载, 两路监测, 次声波, 时频分析, 响应特征

Abstract: In order to monitor underground geological disasters in mines by using infrasound, creep-seepage loading system, acoustic emission acquisition system and infrasound wave acquisition system were used to monitor fracture and destabilization of coal samples under low confining pressure. Then, contrastive analyses were conducted between first channel infrasound signal coupled with oil body in confining pressure cylinder and second channel infrasound signal coupled with air outside the cylinder. The first signal had obvious response characteristics before fracture and conformed fairly well with stress-strain curve and acoustic emission signal with no significant changes before elastic stage. It was superior to the second signal and witnessed abnormal signals at late plastic stage, and its sound pressure gradually increased. The results show that coal sample failure causes wide-band phenomenon, and signal strength is larger as frequency is lower, with maximum strength at 1 Hz. Characteristics of abnormal infrasound waves can be regarded as one of the bases for coal failure determination.

Key words: low confining pressure, two-way monitoring, infrasonic wave, time-frequency analysis, response characteristics

中图分类号:

X936

王云刚, 邓万九, 张宏图, 魏建平, 徐彦茹. 低围压煤样破裂过程次声波响应特征研究[J]. 中国安全科学学报, 2020, 30(2): 14-20.

WANG Yungang, DENG Wanjiu, ZHANG Hongtu, WEI Jianping, XU Yanru. Infrasonic wave response characteristics of coal samples in fracture process under low confining pressure[J]. China Safety Science Journal, 2020, 30(2): 14-20.

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低围压煤样破裂过程次声波响应特征研究

Infrasonic wave response characteristics of coal samples in fracture process under low confining pressure

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