School of Safety Engineering,North China Institute of Science and Technology,Beijing ,China

为了研究瓦斯对煤体电阻率的影响规律,建立了含瓦斯煤体电阻率测试系统,测试分析了不同瓦斯压力下不同矿区煤样电阻率的变化规律,系统阐述了瓦斯压力对煤体电阻率的作用机制。结果表明:随着瓦斯压力的增大,煤体电阻率均呈下降趋势,电阻率y与瓦斯压力x符合y=a+bln(x+c)(a,b,c为常数)的关系,且相关系数较高,电阻率在试验前期下降幅度较大,后期下降幅度变小并趋于平稳;瓦斯对煤体电阻率的影响可分为热力学、电学、力学3种机制,含瓦斯煤体视电阻率的呈现是3种机制共同作用的结果,煤的吸附放热过程、导电能垒的下降和应力对煤分子的作用都会导致含瓦斯煤体电阻率的下降,其中应力对煤分子的作用即应力作用机制为主导机制。

In order to study the influence law of the gas to the coal resistivity,a resistivity test system of the gas contained coal was established. The resistivity variation law of the coal samples from different mining area under the different gas pressure was tested and analyzed. The paper systematically stated the function mechanism of the gas pressure to the coal resistivity. The results showed that with the gas pressure increased,the coal resistivity would be in a declined trend. The resistivity and the gas pressure could meet the relationship y=a+bln(x+c).The correlation coefficient was high. In the initial period of the test,the resistivity would have a high decrease range and in the late period,the resistivity would have a low decrease range and then would be in stable. The gas would be affected to the coal resistivity and would be divided to three mechanisms of the thermodynamics,electrics and mechanics. The apparent resistivity of the gas contained coal would be the joint function results of the three mechanisms. The exothermic process of the coal adsorption,conductive energy barrier reduced and stress effect to the coal molecules all would cause the reduction of the gas contained coal.Among them,the stress effect to the coal molecules and the stress effect mechanism would be the leading mechanism.

国家自然科学基金青年科学基金资助项目(51504097,51604116)；中央高校基本科研业务费资助项目(3142015001)；河北省高等学校科学技术研究资助项目(BJ201603)；