Differences of Mechanical Parameters and Rockburst Tendency Indices between Coal and Non-Coal Rocks and Modified Rockburst Tendency Classification Criteria for Non-Coal Rocks

doi:10.3390/app11062641

	Differences of Mechanical Parameters and Rockburst Tendency Indices between Coal and Non-Coal Rocks and Modified Rockburst Tendency Classification Criteria for Non-Coal Rocks
	Du, Kun 1,2; Sun, Yu 2; Yang, Songge 2; Lv, Shizhan 3; Wang, Shaofeng 2
刊名	APPLIED SCIENCES-BASEL
	2021-03-01
卷号	11 期号:6 页码:16
关键词	rock burst coal non-coal rock basic mechanical parameter bursting liability index classification criterion
DOI	10.3390/app11062641
英文摘要	Rockbursts represent hazardous dynamic disasters for underground coal mines and other underground rock engineering projects. Some bursting liability indices are put forward and applied to identify the likelihood of rock burst occurrence. The classification criteria of the bursting liability indices are proved to be reasonable for coals, but they are still immature for non-coal rocks. Thus, it is uncertain that it is reasonable to use the classification criteria of coal for evaluating the bursting liability of non-coal rocks. Hence, in this study, a large amount of data, such as the basic mechanical parameters, i.e., Poisson's ratio mu, elastic modulus E, uniaxial compressive strength sigma(c), and uniaxial tensile strength sigma(t), and the bursting liability indices, i.e., elastic strain energy index W-ET, bursting energy index W-cf, dynamic fracture duration time DT, and brittleness index B, of different coals and non-coal rocks were collected in China. Then, the differences of mechanical parameters and rockburst tendency indices between coal and non-coal rocks were studied systematically, and apart from the Poisson's ratio mu, the other three basic mechanical parameters of coal and non-coal rocks have great differences in data distribution and concentration scope, which proved that the non-coal rocks cannot share the same index system and classification criteria of coals. In addition, the evaluation results of a single index for rock bursting liability of rocks were directly compared in pairs, and the inconsistency rate for coals is about 42-68%. It is necessary to build a comprehensive evaluation method to evaluate the bursting liability of rocks. At last, the modified rockburst tendency classification criteria for non-coal rocks were put forward. It is reasonable to use the classification criteria of the W-ET and W-cf to classify the bursting liability of non-coal rocks, while it is unreasonable to use that of the DT and sigma(c). It has been concluded that the index B are more suitable for non-coal rocks, and a new index, named strength decrease rate (SDR), was proposed to determine the bursting liability, which is the ratio of uniaxial compressive strength sigma(c) to duration of dynamic fracture DT.
资助项目	National Natural Science Foundation of China[51904333] ; National Natural Science Foundation of China[51774326] ; National Natural Science Foundation of China[41702350] ; Fundamental Research Funds for the Central Universities of Central South University[2020zzts714]
WOS研究方向	Chemistry ; Engineering ; Materials Science ; Physics
语种	英语
出版者	MDPI
WOS记录号	WOS:000645804800001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27223]
专题	中科院武汉岩土力学所
通讯作者	Wang, Shaofeng
作者单位	1.Cent South Univ, Adv Res Ctr, Changsha 410083, Peoples R China 2.Cent South Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Du, Kun,Sun, Yu,Yang, Songge,et al. Differences of Mechanical Parameters and Rockburst Tendency Indices between Coal and Non-Coal Rocks and Modified Rockburst Tendency Classification Criteria for Non-Coal Rocks[J]. APPLIED SCIENCES-BASEL,2021,11(6):16.
APA	Du, Kun,Sun, Yu,Yang, Songge,Lv, Shizhan,&Wang, Shaofeng.(2021).Differences of Mechanical Parameters and Rockburst Tendency Indices between Coal and Non-Coal Rocks and Modified Rockburst Tendency Classification Criteria for Non-Coal Rocks.APPLIED SCIENCES-BASEL,11(6),16.
MLA	Du, Kun,et al."Differences of Mechanical Parameters and Rockburst Tendency Indices between Coal and Non-Coal Rocks and Modified Rockburst Tendency Classification Criteria for Non-Coal Rocks".APPLIED SCIENCES-BASEL 11.6(2021):16.