Abstract
Effect of mining on pressure variation in coal rock mass has been analyzed. Methods to determine integral permeability as well as fluid pressure variations within undermined coal rock mass have been proposed. A technique to identify zones of “fast” gas and “slow” gas within undermined formation has been considered.
Highlights
It has been determined recently that while extracting methane from coal mines, maximum gas amount can be captured by means of holes from coal rock mass undermined in the process of coal mining
Gas pressure declines and permeability of coal rock mass varies due to the undermined formation softening, and partial methane emission [3]
After subsidence of roof rocks, certain share of methane drains into mine workings from the undermined formation; certain share remains in the rock mass which results in pressure variation
Summary
It has been determined recently that while extracting methane from coal mines, maximum gas amount can be captured by means of holes from coal rock mass undermined in the process of coal mining. Formation of technogenic methane accumulations results from subsidence of roof rocks, their softening as well as free gas and liberated gas emission to mine workings, and fractured zones of the coal rock mass [1, 2]. Gas pressure declines and permeability of coal rock mass varies due to the undermined formation softening, and partial methane emission [3]. Determination of pressure variation within rock mass is an important problem [4] since it will help identify residual methane reserves, the rock mass permeability, and parameters of degassing holes
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