Abstract
Surrounding rock of coal seam was one of the important factors to gas occurrence. The coal seam gas occurrence was studied by the index of roof strata thickness or sand content rate; we found that there were certain shortcomings. In order to reasonably evaluate the influence of coal seam surrounding rock on gas occurrence in Panji mining area, we quantitatively evaluated the effect of coal seam surrounding rock on gas occurrence by influence coefficient of roof strata thickness, and built six mathematical models of the variational gas content in the mining area which is divided into six gas geological units. The results shows that the coal seam gas content is mainly influenced by 20 mroof strata in each gas geological unit, the gas content presents the tendency of increase, and with the influence coefficient of strata thickness increases, they exist a significant linear relationship.
Highlights
Coal seam gas is methane as the main components of gas that coal material produce in the process of coal accumulation and it has long been considered to be harmful gas on threat to coal mine safety production
The coal seam gas occurrence was studied by the index of roof strata thickness or sand content rate; we found that there were certain shortcomings
In order to reasonably evaluate the influence of coal seam surrounding rock on gas occurrence in Panji mining area, we quantitatively evaluated the effect of coal seam surrounding rock on gas occurrence by influence coefficient of roof strata thickness, and built six mathematical models of the variational gas content in the mining area which is divided into six gas geological units
Summary
Coal seam gas is methane as the main components of gas that coal material produce in the process of coal accumulation and it has long been considered to be harmful gas on threat to coal mine safety production. Surrounding rock of coal seam was one of the important factors to gas preservation conditions, enrichment degree, general think permeability rock roof is helpful for gas emissions, and hermetic rock is helpful for gas preservation. Take Huainan Panji mining area 13-1 coal seam as an example, this paper will evaluate the effect of coal seam surrounding rock on gas occurrence by influence coefficient of roof strata thickness to determine reasonable evaluation of roof thickness values range, and build mathematical models between the influence coefficient of roof strata thickness and gas content. The paper will evaluate the influence degree of surrounding rock of coal seam and gas occurrence
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