Sentence examples for coal damage from inspiring English sources

Meanwhile, as there is few coupled permeability models taking the coal-damage effect into account, previous permeability-variation analysis seldom commonly considered the mining-induced coal damage, coal mechanics changes and gas adsorption, which results in the permeability underestimation.

Despite the extensive research conducted on coal permeability, few studies have considered the effect of coal damage on permeability.

The Cui-Bustin permeability model was improved by taking into account the impact of coal damage on permeability.

The aim of this study is to investigate the effect of coal damage on permeability and gas drainage performance.

Therefore, in this paper, a mathematical model which incorporates the coal permeability with coal damage, coal mechanical property and the gas adsorption was developed.

It was found that the model could better characterize the damage evolution of the coal, which then provided some theoretical reference values for the prediction of the coal damage.

However, the coal formation damage controls the gas rate more than the shrinkage for the examined case study with the assumed coal shrinkage parameters.

But its leaders know that they must move away from coal: the damage to health from a year of Chinese coal-burning dwarfs any caused by the nuclear industry.

Finally, by considering the effect of coal seam damage on permeability, the gas drainage that may be enhanced by high-pressure air blasting is quantified based on the numerical simulations.

It establishes a theoretical model for coal unloading damage and permeability increasing.

Open image in new window Fig. 3 Permeability evolution during coal unloading damage Open image in new window Fig. 4 Permeability evolution and unloading fracture development.