含瓦斯煤体单轴压缩电阻率变化规律实验研究
Experimental Study on Resistivity Variation Laws of Coal Containing Gas Under Uniaxial Compression
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摘要: 建立了含瓦斯煤体单轴压缩电阻率实时测试系统，测试并对比分析了含瓦斯煤体和不含瓦斯煤体在单轴压缩过程中的电阻率变化，并对瓦斯对电阻率变化的影响机制进行了探讨。研究结果表明：2种实验条件下煤体电阻率均呈现先减小后增大的变化规律；电阻率减小阶段，游离态瓦斯对电阻率的减小有延缓阻碍作用，即电阻率随加载应力的增大呈持续平缓减小趋势，未出现不含瓦斯煤体实验中出现的突降现象；电阻率增大阶段，游离态瓦斯对电阻率的增大有促进作用，即电阻率“拐点”处所对应的加载应力水平较之不含瓦斯煤体更小；煤体发生破裂之后，电阻率增长幅度普遍小于不含瓦斯煤体。Abstract: The real-time testing system of resistivity on coal containing gas under uniaxial compression were established where the resistivity changes of coal containing gas and coal not containing gas during the uniaxial compression were tested and analyzed, the gas mechanism was expounded. The research results indicated that the resistivity of the coal under two experimental conditions was presented to increase after the decrease；in resistivity decreasing stage, free gas played a delay effect on decrease of resistivity, which was that the rate of resistivity presented a trend of gradual decrease along with the increase of stress and it did not appear the phenomenon of sudden drop in the experiments of coal not containing gas; in resistivity increasing stage, free gas had a promoting effect on the increase of resistivity, which was that the stress level corresponding to resistivity at an "inflection point" was smaller than coal not containing gas, following the rupture in coal, increasing amplitude of the coal containing gas' resistivity was less than coal not containing gas generally.
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Keywords:
- coal containing gas /
- uniaxial compression /
- resistivity /
- variation law /
- loading stress /
- coal and gas outburst
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