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为了深入研究渗透率与温度和应力的关系,分别采用吸附性气体甲烷和非吸附气体氦气,进行了不同应力条件,不同温度条件下的煤体渗流实验.结果表明,不同有效应力条件下煤体渗透率与温度的关系,并非单调递增或单调递减,而是存在一个转折区,转折区的位置取决于有效应力与热应力的大小对比关系,低有效应力条件下,热应力大于有效应力,煤体外膨胀,渗透率随温度的升高而增大,呈正指数关系;高有效应力条件下,热应力小于有效应力,煤体内膨胀,渗透率随温度的增加而减小,呈负指数关系.这一发现将以往的矛盾结果统一了起来.
In order to further study the relationship between permeability and temperature and stress, the experiments of coal seepage under different stress conditions and different temperatures were carried out by using adsorbed methane and non-adsorbed helium, respectively. The results show that under different effective stress conditions, coal The relationship between body permeability and temperature is not a monotonous increase or monotonous decrease, but there is a transition zone, the transition zone depends on the effective stress and thermal stress size contrast, low effective stress conditions, the thermal stress is greater than the effective stress, Under the condition of high effective stress, the thermal stress is less than the effective stress. The expansion and permeability of coal decrease with the increase of temperature, showing a negative exponential relationship. This finding unifies the conflicting results of the past.