Experimental study on the deformation localisation and acoustic emission characteristics of coal in Brazilian splitting tests

被引：3
作者：
Guo, Wei-Yao [1 ,2 ,3 ]
Zhang, Wei [1 ,2 ,3 ]
Zhang, Cheng-Guo [1 ,2 ,3 ,4 ]
Chen, Yang [5 ]
机构：
[1] Shandong Univ Sci & Technol, Coll Energy & Min Engn, Qingdao 266590, Peoples R China
[2] Shandong Univ Sci & Technol, State Key Lab Min Disaster Prevent & Control Cofo, Qingdao 266590, Peoples R China
[3] Shandong Univ Sci & Technol, Minist Sci & Technol, Qingdao 266590, Peoples R China
[4] UNSW Sydney, Sch Minerals & Energy Resources Engn, Sydney, NSW, Australia
[5] Shandong Energy Grp Co Ltd, Jinan 250014, Peoples R China
来源：
SCIENTIFIC REPORTS | 2022年 / 12卷 / 01期
基金：
中国国家自然科学基金;
关键词：
ROCK BURSTS; FRACTURE; AE; SPECIMENS; RADIATION; BEHAVIOR; FAILURE; STRAIN; DAMAGE; RULES;
D O I：
10.1038/s41598-022-10332-7
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
This paper presents an experimental study to assess the behaviour of coal samples under tensile loadings to better understand the failure mechanisms and the interactions with the coal characteristics. A set of Brazilian splitting tests were carried out using disk specimens obtained from Tashan Coal Mine in China. The digital speckle correlation method and acoustic emission (AE) were used to capture the deformation localisation and AE characteristics of each specimen during the loading process. The precursor characteristics of AE and the failure mechanism are discussed. It was found that the entire loading process mainly consists of compaction, elastic and post-peak dropping stage without an obvious yielding stage. Two kinds of deformation localisation were observed: central symmetry and axis symmetry. The corresponding AE evolution patterns have different phases, including gradual rise, step rise, transient rise and steady rise. During the subcritical failure stage, AE counts demonstrate a "rapidly increasing + flatten" intermittent feature. The results provide a reference for a better understanding of the damage process of the brittle coal material and its application in ground control design.
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页数：13
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