吸附与应力耦合作用影响下煤体瓦斯渗透规律的实验研究

利用自行研制的真三轴煤岩渗透测试系统对煤样试件进行了不同应力条件下不同吸附瓦斯压力的渗透率测定,研究了吸附与应力耦合作用影响下煤体瓦斯渗透规律。结果表明:在一定应力条件下,随着煤样内瓦斯吸附量的降低,渗透率可能会出现2种情况:一是渗透率将不断地增加;二是渗透率先减小,当减小到最小值后,渗透率将不断增加。在瓦斯压力一定的条件下,降低煤样所受围压,渗透率与围压间较好地符合负指数函数的关系。

Test of Methane Seepage Rule Influenced by Absorption and Stress Coupling Action

Applying self-developing real 3-aixal coal-rock seepage test system to measuring permeability of coal samples under different stress and different absorption methane pressure condition,rule of methane seepage influenced by absorption and stress coupling action.Results showed that with methane absorption amount decreased,seepage ratio would take on 2 states under some stress condition.One was that permeability increasingly added,the other was that permeability reduced at first,when it reduced to the minimum value,permeability would increase.Under some methane pressure,permeability and surrounding pressure met better negative exponent relationship when surrounding pressure reduced.