摘要
本文以物理模拟试验研究了地应力、孔隙压力和吸附相瓦斯对煤层瓦斯运移的影响。当孔隙压力变化不大时,达西定律是适用的,克林伯格方程可以包括分子滑流和吸附相瓦斯的运移。煤层渗透率与有效应力的关系符合负指数方程(加载试验)和负幂函数方程(卸载试验),并且对应力敏感。煤体吸附瓦斯后产生的膨胀应力符合朗格缪尔方程。确定了煤层瓦斯运移本构方程,数值模拟结果证实采面及煤巷两侧的煤层瓦斯压力分布存在拐点,煤壁瓦斯涌出预测方程为负幂函数。
This paper studied the effect of ground stress,pore pressure,and adsorbed methane on gas migration in coal seams.When variation of pore pressure is small,Darcy's Law is applicable.Klinkenberg equation includes molecular streaming and migration of adsorbed gas.The relation between permeability and effective stress follows negative exponential function (load test)or negative power function (de-load test).The expansion stress produced by adsorption of gas by coal solid accords with Langmur equation,which is sensitive to stress.The constitutive equation for migration of gas in seam js determined.Numeric simulation shows that there is a inflection point of gas pressure distribution in coal solid in a work face and heading face.Equation for predicting gas emission from coal solid is a negative power function.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
1992年第2期49-56,共8页
Journal of China Coal Society
基金
煤炭自然科学基金资助项目
关键词
煤层
瓦斯
运移
数值模拟
gas migration
constitutive equation
effective stress
expansion stress
numeric simulation
