含瓦斯煤渗透率影响因素敏感性试验研究  

Sensitivity Test Study on Influencing Factors of Coal Containing Methane Permeability

作　　者：周建辛 王毅[1] ZHOU Jianxin;WANG Yi(Mining Engineering College, Taiyuan University of Technology, Taiyuan 030024, China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024

出　　处：《煤矿安全》2019年第2期6-9,共4页Safety in Coal Mines

摘　　要：利用三轴瓦斯渗流试验装置对不同含水率的含瓦斯煤进行渗流试验,揭示了受多因素影响的含瓦斯煤渗透率的一些新的认识:不同条件下含瓦斯煤的渗透率均随着轴压的增加而呈现出先减小后增加的趋势,同时发现,含水率越低的煤样,其渗透率随轴压变化的敏感性越强;温度对含瓦斯煤渗透率的影响与外围约束应力(围压)有关,外围约束应力较小时,温度所产生的热应力占主导地位,煤体外膨胀,其渗透率随温度的升高而增加;反之,外围约束应力占主导地位,煤体向内挤压密实,其渗透率随温度的升高而减小。并且发现在外围约束应力较小时,含水率越高的煤样,其渗透率随温度变化的敏感性越强。The seepage test of coal containing methane with different moisture content is carried out by the triaxial methane seepage test device. It reveals some new insights into the permeable rate of methane that has been affected by many factors. Under different conditions, the permeability of coal containing methane with axial pressure increases with the increase of axial compression. At the same time, it is found that the permeability of coal with lower moisture content is stronger with the change of axial pressure. The influence law of temperature on the permeability of coal containing methane is associated with peripheral restraint stress(confining pressure). When the external constraint stress is small, the thermal stress caused by temperature is dominant, and the permeability of coal expands with the increase of temperature;on the contrary, the external constraint stress is dominant, and the coal body is compacted inward, and its permeability decreases with the increase of temperature. When the external constraint stress is small, the higher the water content, the more sensitive the permeability is to temperature.

关 键 词：含瓦斯煤 渗透率 含水率 外围约束应力 轴压 温度 敏感性 

分 类 号：TD712[矿业工程—矿井通风与安全]