Abstract
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.
Highlights
Coal and gas outbursts are one of the most serious disasters in the mine production process, which causes serious damage to personnel and equipment, and has a serious impact on society [1,2]
Wang et al [4] studied the effect of in-situ stress and joints on coal seam permeability in the Linfen area
(2) Moisture affects the distribution of in-situ stress in coal and rock: under the action of loading and unloading stress field, the stress concentration effect on the inner part of coal and rock is caused by pore water pressure
Summary
Coal and gas outbursts are one of the most serious disasters in the mine production process, which causes serious damage to personnel and equipment, and has a serious impact on society [1,2]. The control of gas disasters can be attributed to the flow of gas in the coal seam, that is, the gas seepage in the coal seam. Studying the gas flow in coal seams is of of great significance for the control of gas disasters. Simulated the response characteristics of pore pressure to the permeability characteristics of raw coal under different in-situ stress loading and unloading paths. Wang et al [4] studied the effect of in-situ stress and joints on coal seam permeability in the Linfen area. Ju et al [5] conducted a series of tests on the methane permeability of fractured coal under different mining stress paths. Xue et al [6]
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