Influence of rock strength on the mechanical behavior and P-velocity evolution of coal-rock combination specimen

doi:10.1016/j.jmrt.2021.03.059

	Influence of rock strength on the mechanical behavior and P-velocity evolution of coal-rock combination specimen
	Zhao, Tong-bin 2,3; Gu, Xue-bin 2,3; Guo, Wei-yao 2,3; Gong, Xu-fei 2,3; Xiao, Ya-xun 1; Kong, Biao 3,4; Zhang, Cheng-guo 2
刊名	JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
	2021-05-01
卷号	12 页码:1113-1124
关键词	Coal-rock combination Mechanical behavior P-velocity AE Energy
ISSN号	2238-7854
DOI	10.1016/j.jmrt.2021.03.059
英文摘要	To research the influence of rock strength on the mechanical behavior, AE characteristics and P-velocity evolution of coal-rock combination specimen, six kinds of combination specimens with different rock strengths are chosen to carry out the ultrasonic wave and uniaxial compression tests. During the loading process, AE signals are monitored. Then, a new method for calculating the P-velocity is given and the relationship between the P velocity and mechanical parameters of coal-rock combination body is discussed. Results show that: (1) As the rock strength of the combination specimen increases, its peak compressive strength increases first and then turns constant while its elastic modulus keeps increasing; meanwhile, the failure model transfers from combination specimen failure to coal dynamic failure. (2) AE energy rate changes from multi-peak to single-peak near the peak stress of combination specimen as increasing the rock strength, which indicates that the released energy of combination body greatly increases in one time. (3) P-velocity of combination specimen is between the rock and coal, but is closer to coal. P-velocity of combination specimen experience an increasing-steady trend with the increase of rock strength. (4) A new method using P-velocity of rock and coal to obtain P-velocity of combination specimen is proposed, which is in good agreement with the test results. Additionally, we found that there exists a linear relationship between the P-velocity of coal-rock combination specimen and the elastic modulus. But no distinct relationship can be determined between the P-velocity of coal-rock combination specimen and the peak stress. This & nbsp;method provides a new idea for predicting the capacity of energy storage of coal-rock combination structure in the filed practice. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
资助项目	Major Program of Shandong Provincial Natural Science Foundation[ZR2019ZD13] ; Shandong Provincial Natural Science Foundation[ZR2019BD063] ; Major Scientific and Technological Innovation Project of Shandong Provincial Key Research Development Program[2019SDZY01]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000654682500008
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27106]
专题	中科院武汉岩土力学所
通讯作者	Gu, Xue-bin; Gong, Xu-fei
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Shandong Univ Sci & Technol, Coll Energy & Min Engn, Qingdao 266590, Peoples R China 3.Shandong Univ Sci & Technol, State Key Lab Min Disaster Prevent & Control Cofo, Qingdao 266590, Peoples R China 4.Shandong Univ Sci & Technol, Coll Safety & Environm Engn, Qingdao 266590, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Tong-bin,Gu, Xue-bin,Guo, Wei-yao,et al. Influence of rock strength on the mechanical behavior and P-velocity evolution of coal-rock combination specimen[J]. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,2021,12:1113-1124.
APA	Zhao, Tong-bin.,Gu, Xue-bin.,Guo, Wei-yao.,Gong, Xu-fei.,Xiao, Ya-xun.,...&Zhang, Cheng-guo.(2021).Influence of rock strength on the mechanical behavior and P-velocity evolution of coal-rock combination specimen.JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,12,1113-1124.
MLA	Zhao, Tong-bin,et al."Influence of rock strength on the mechanical behavior and P-velocity evolution of coal-rock combination specimen".JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 12(2021):1113-1124.