Permeability evolution during progressive deformation of intact coal and implications for instability in underground coal seams

2013 ◽  
Vol 58 ◽  
pp. 34-45 ◽  
Author(s):  
Shugang Wang ◽  
Derek Elsworth ◽  
Jishan Liu
Keyword(s):  
Permeability Evolution ◽  
Coal Seams ◽  
Progressive Deformation

scholarly journals An Experimental Investigation of the Gas Permeability of Tectonic Coal Mineral under Triaxial Loading Conditions

Minerals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 70
Author(s):  
Zhaoying Chen ◽  
Guofu Li ◽  
Yi Wang ◽  
Zemin Li ◽  
Mingbo Chi ◽  
...  
Keyword(s):  
Gas Permeability ◽  
Test System ◽  
Gas Pressure ◽  
Permeability Evolution ◽  
Coal Seams ◽  
Triaxial Loading ◽  
Negative Exponential Function ◽  
Gas Outburst ◽  
Gas Seepage ◽  
Tectonic Coal

Underground coal mining of CH4 gas-rich tectonic coal seams often induces methane outburst disasters. Investigating gas permeability evolution in pores of the tectonic coal is vital to understanding the mechanism of gas outburst disasters. In this study, the triaxial loading–unloading stresses induced gas permeability evolutions in the briquette tectonic coal samples, which were studied by employing the triaxial-loading–gas-seepage test system. Specifically, effects of loading paths and initial gas pressures on the gas permeability of coal samples were analyzed. The results showed the following: (1) The gas permeability evolution of coal samples was correlated with the volumetric strain change during triaxial compression scenarios. In the initial compaction and elastic deformation stages, pores and cracks in the coal were compacted, resulting in a reduction in gas permeability in the coal body. However, after the yield stage, the gas permeability could be enhanced due to sample failure. (2) The gas permeability of the tectonic coal decreased as a negative exponential function with the increase in initial gas pressure, in which the permeability was decreased by 67.32% as the initial gas pressure increased from 0.3 MPa to 1.5 MPa. (3) Coal samples underwent a period of strain development before they began to fail during confining pressure releasing. After the stress releasing-induced yield stage, the coal sample was deformed and cracked, resulting in a quickly increase in gas permeability. With a further releasing process, failure of the sample occurred, and thus induced rapidly increasing gas permeability. These obtained results could provide foundations for gas outburst prevention in mining gas-rich tectonic coal seams.

Resource-saving technologies during mining of thin and very thin coal seams

2014 ◽  
Vol 8 (1) ◽  
pp. 55-60
Author(s):  
V Buzylo ◽  
◽  
O Koshka ◽  
S Poimanov ◽  
D Malashkevych ◽  
...  
Keyword(s):  
Coal Seams ◽  
Resource Saving

Use of Destressing Drilling to Ensure Safety of Donbass Gas-bearing Coal Seams Extraction

2019 ◽  
pp. 7-11
Author(s):  
V.S. Brigida ◽  
◽  
Yu.V. Dmitrak ◽  
O.Z. Gabaraev ◽  
V.I. Golik ◽  
...  
Keyword(s):  
Coal Seams ◽  
Gas Bearing

MINE STUDIES OF IMPROVED TECHNOLOGY OF UNDERGROUND FRACTURING OF COAL SEAMS FOR THE PURPOSE OF EFFICIENT PRELIMINARY DEGASSING

2018 ◽  
Vol 1 (3) ◽  
pp. 16-22
Author(s):  
E.V. Mazanik ◽  
◽  
A.V. Ponizov ◽  
S.V. Slastunov ◽  
P.N. Paschenkov ◽  
...  
Keyword(s):  
Coal Seams ◽  
Improved Technology ◽  
Preliminary Degassing

Spatial regularities of manifestation of fluidities coal seams

2018 ◽  
Vol 11 (48) ◽  
pp. 274-285
Author(s):  
Lis S.N. ◽  
◽  
Kubaichuk Yu.A. ◽  
Keyword(s):  
Coal Seams

Integrated estimation of strength properties of complex-structure coal seams

2019 ◽  
Vol 8 ◽  
pp. 33-41 ◽  
Author(s):  
Yu.N. Linnik ◽  
◽  
V.Yu Linnik ◽  
A.B. Zhabin ◽  
A.V. Polyakov ◽  
...  
Keyword(s):  
Complex Structure ◽  
Strength Properties ◽  
Coal Seams ◽  
Integrated Estimation

Substantiation of safe underground mining in series of coal seams under hydraulic fill

2018 ◽  
Vol 8 ◽  
pp. 217-226
Author(s):  
Yu.I. Kutepov ◽  
◽  
A.S. Mironov ◽  
Yu.Yu. Kutepov ◽  
M.V. Sablin ◽  
...  
Keyword(s):  
Underground Mining ◽  
Coal Seams ◽  
Hydraulic Fill ◽  
In Series
Sign in / Sign up

Export Citation Format

Share Document