关键词: 煤层渗透性, 采动响应, 瓦斯流量, 渗透率采动响应模型

Abstract: In order to obtain the mining response mechanism of the permeability in high gas and low permeability coal seam, the paper studied the mining response mechanism of permeability deeply by using the combining methods of theoretical analysis, numerical simulation and field test. And the paper established the mining response mathematical and mechanical model of permeability by using Kozeny-Carman equation based on the basic definition of porosity. The results show that the permeability experiences the process of decreasing and then increasing affected by mining. Mining is the key factor affecting the permeability. The variation of permeability and gas flow of coal seam is consistent affected by mining. The fractured development and the extent of damage at the return airway side seam is greater than that of haulage roadway at the same location away from the face, the permeability of the return airway side seam is greater than that of haulage roadway. The permeability of the seam near working face is the maximum, the drainage rate can be increased and the gas concentration of the working face can be reduced if draining gas continuously, and it can prevent the gas gauge effectively and provide protection for the safe and efficient mining.

Key words: permeability, mining response, gas flow, permeability mining response model