构造煤单轴压缩条件下电阻率变化规律的实验研究

为了研究煤与瓦斯突出灾害在孕育、形成、发生过程与构造煤受力失稳破坏的关系，对构造煤在单轴压缩条件下其电阻率变化规律进行测试。结果表明：对于以电子导电为主的构造煤，荷载达到其抗压强度之前，电阻率持续下降，电阻率最小值出现在荷载达到煤样抗压强度时，随后随着煤样失稳破坏，其电阻率突然升高；中等变质程度的鹤壁贫瘦煤样，当荷载达到其抗压强度的75%左右时，出现电阻率突然下降的情况，而高变质程度的焦作无烟煤和低变质程度的淮南气肥煤，在单轴压缩的过程中，其电阻率下降较为平缓。另外，随着加载速率的增加，构造煤在单轴压缩的过程中其电阻率变化幅度减小。

Study on the rules of electrical resistivity variation of tectonic coal in uniaxial compression experiment

In order to investigate the relationship between the coal and gas outburst generating process and the instability and failure of tectonic coal，the uniaxial compression experiment was conducted for tectonic coal，and the electrical resistivity of tectonic coal was tested simultaneously.The results indicate that electrical resistivity of tectonic coal samples decline before external load reaches the pressive strength，the minimum value of electrical resistivity appears when external load reaches the pressive strength and the electrical resistivity suddenly increases with tectonic coal samples being instability and failure.When external load reaches 75% of compressive strength value of medium metamorphic grade coal samples from Hebi mining area，their electrical resistivity abruptly deceases，while the coal samples with high metamorphic grade and low metamorphic grade respectively from Huainan mining area and Jiaozuo mining area gently，their electrical resistivity decreases without abrupt change.In addition，the change amplitude of electrical resistivity of tectonic coal samples decreases as loading speed increases.