煤层渗透性变化影响因素分析

摘要

研究了应力、克林肯伯格效应、煤基质收缩效应对煤层渗透性的影响.研究表明,随着煤层瓦斯的解吸,孔隙压力的降低,煤基质发生收缩,吸附膨胀变形减小,渗透率将增大;体积应力的增加,在孔隙瓦斯压力保持不变的情况下,有效应力将增加,煤层瓦斯的渗透率随之减小;由于克林肯伯格效应的存在,从而增加瓦斯气体的流速,使得煤层的渗透性有所改善.对各影响因素的研究,对于防治矿井瓦斯灾害、合理利用煤层气资源具有重要意义.%The influence of stress, Klinkenberg effects and shrinkage effects to coal seam permeability are analyzed. The research results show that as gas in coal seam desorbs and gas stress decreases, coal matrix shrinks so as to make adsorption swelling deformation smaller and increase the permeability of coal seam. When stress increases and gas pressure is not changed coal seam permeability decreases. Because of the existence of Klinkenberg effects gas flow speed and coal seam permeability increase. The researches have important significance to prevent gas disaster and develop gas resource in mine.