干旱区生态环境知识资源中心(Arid): Mechanisms of failure in coal samples from underground water reservoir

Arid

DOI	10.1016/j.enggeo.2020.105494
	Mechanisms of failure in coal samples from underground water reservoir
	Yao, Qiangling 1,2; Tang, Chuanjin 1,2; Xia, Ze 1,2; Liu, Xiaoli 3; Zhu, Liu 1,2; Chong, Zhaohui 1,2; Hui, Xindong 1,2
通讯作者	Tang, Chuanjin
来源期刊	ENGINEERING GEOLOGY
ISSN	0013-7952
EISSN	1872-6917
出版年	2020
卷号	267
英文摘要	Using goaf as water storage space plays an important role in the ecological environment and economic development of arid mining areas, while water content affects the rock strength and the stability of coal pillars in underground water reservoirs by changing crack propagation. In this work, variable-angle shear tests (compression-shear tests) were conducted for coal samples with moisture contents of 0%, 7.10%, 15.68%, 22.90%, and 23.09% to develop new insights into the mechanisms of crack propagation and strength weakening, combined with acoustic emission (AE) technique and infrared thermal imaging technique. The results show that the main cracks in dry coal samples exist along the shear surface, while the fracture surface in the saturated samples deviates from the shear surface and many irregular shear cracks form. The shear strength, cohesion, and internal friction angle of coal samples decrease linearly or exponentially with water content. Given this result, we discuss the Mohr-Coulomb criterion for coal samples based on water content. Increasing the water content weakens the effect of increased heating at the center of the coal samples, and especially the saturated coal samples emitted less infrared radiation than the loading device in the destructive phase. The average infrared radiation temperature (AIRT), AE energy rate and shear stress distribution are all correlated, which reflect the characteristics of the destructive process within water-containing samples. After the formation of macro-fractures, the increased contact area of fracture surfaces with the air causes heat to suddenly reduce. These results indicate the failure mechanism involving the destabilized deformation of coal samples under compression shear, which gives a useful reference for designing waterproof coal pillars and underground reservoir dams.
英文关键词	Ecologically fragile area Coal Underground water reservoir Compression-shear failure Mechanical properties Crack propagation
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000518868200004
WOS关键词	PROPAGATION THRESHOLDS ; FRACTURE EVOLUTION ; ACOUSTIC-EMISSION ; CRACK INITIATION ; ROCK ; STRENGTH ; ENERGY ; SPECIMENS ; VELOCITY ; FLUID
WOS类目	Engineering, Geological ; Geosciences, Multidisciplinary
WOS研究方向	Engineering ; Geology
来源机构	清华大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314398
作者单位	1.China Univ Min & Technol, Key Lab Deep Coal Resource Min, Minist Educ, Xuzhou 221008, Jiangsu, Peoples R China; 2.China Univ Min & Technol, Sch Mines, Xuzhou 221008, Jiangsu, Peoples R China; 3.Tsinghua Univ, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China
推荐引用方式 GB/T 7714	Yao, Qiangling,Tang, Chuanjin,Xia, Ze,et al. Mechanisms of failure in coal samples from underground water reservoir[J]. 清华大学,2020,267.
APA	Yao, Qiangling.,Tang, Chuanjin.,Xia, Ze.,Liu, Xiaoli.,Zhu, Liu.,...&Hui, Xindong.(2020).Mechanisms of failure in coal samples from underground water reservoir.ENGINEERING GEOLOGY,267.
MLA	Yao, Qiangling,et al."Mechanisms of failure in coal samples from underground water reservoir".ENGINEERING GEOLOGY 267(2020).