Study on the effects of temperature and immersion on the acoustic emission and electromagnetic radiation signals of coal rock damage under load

被引：5

作者：

Gao L. ^{[1
]}

Zhang W. ^{[1
]}

Lu W. ^{[1
,2
,3
]}

Hu X. ^{[1
]}

Wu H. ^{[1
]}

Wang J. ^{[1
]}

Kong B. ^{[1
,2
,3
,4
]}

机构：

[1] College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao

[2] Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education(Anhui University of Science and Technology), Huainan

[3] State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao

[4] College of Civil & Structural Engineering, Shandong University of Science and Technology, Qingdao

来源：

Engineering Geology | 2022年 / 297卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Acoustic emission; Coal rock; Deformation and failure; Electromagnetic radiation; Fractal; Temperature-immersion;

D O I：

10.1016/j.enggeo.2021.106503

中图分类号：

学科分类号：

摘要：

As the mining depth increases year by year, the geological environment of the coal seam becomes more complex. Coal rocks are vulnerable to damage from high temperature, immersion, high ground stress and other factors. This study is aimed at realizing the monitoring and early warning of coal rock dynamic disasters in complex environments such as high temperature and immersion. Firstly, mechanical properties of coal rocks after high temperature and immersion treatment were tested through experiments. It was found that both high temperature and immersion can cause mechanical damage to coal rock. In addition, the acoustic emission (AE) and electromagnetic radiation (EMR) signals generated by coal rock samples during failure were collected in real time. The following conclusions were drawn: All these signals are closely related to the damage degree of coal rock. The AE and EMR signals generated by coal rock under load after different temperature treatments were different, and their intensity decrease after immersion treatment. Furthermore, the damage of coal samples caused by high temperature and immersion was explored through quantitative analysis, and the evolution law of crack propagation during coal rock failure was discussed. The mechanical properties of coal rock after the damage of high temperature and immersion and the mechanisms of AE and EMR signal generation and variation during deformation and failure were revealed. This study provides theoretical guidance for the monitoring of coal rock dynamic disasters. © 2021 Elsevier B.V.

引用

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