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Open AccessArticle

Experimental Study on Mechanics and Permeability Properties of Water-Bearing Raw Coal Samples Under In-Situ Stress

by Zuxun Zhang 1,2,*, Hongtu Wang 1,2, Li Wang 3 and Dongming Zhang 1,2
1
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
2
College of Resources and Environmental Science, Chongqing University, Chongqing 400044, China
3
Nantong Mine of Chongqing Energy Investment Group Co., Chongqing 400800, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(12), 2549; https://doi.org/10.3390/app9122549
Received: 23 May 2019 / Revised: 19 June 2019 / Accepted: 20 June 2019 / Published: 21 June 2019
(This article belongs to the Section Environmental and Sustainable Science and Technology)
In this paper, we investigated the mechanical and permeability characteristics of water-bearing raw coal samples under in-situ stress, and came to some conclusions, as follows: the peak strength and peak axial strain of samples gradually decrease with the increase of water content. Under the same stress condition, the higher the water content is, the lower the axial strain and radial strain will be. The peak strength and peak strain of the sample both decrease with the water content as a quadratic function. During the post-peak loading and unloading process, with the increase of the number of cycles of loading and unloading, the radial strain decrement and increment of the raw coal sample gradually decrease after loading and unloading confining pressure. The permeability of samples gradually decreases with the loading confining pressure, and the permeability of the sample gradually increases with the unloading confining pressure. The permeability of coal samples increases volatility with the increase of axial strain, and the fitted sample permeability and effective stress are subject to the ExpDec1 function distribution. View Full-Text
Keywords: water content; in-situ stress; post-peak loading and unloading; mechanical properties; permeability characteristics water content; in-situ stress; post-peak loading and unloading; mechanical properties; permeability characteristics
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MDPI and ACS Style

Zhang, Z.; Wang, H.; Wang, L.; Zhang, D. Experimental Study on Mechanics and Permeability Properties of Water-Bearing Raw Coal Samples Under In-Situ Stress. Appl. Sci. 2019, 9, 2549.

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