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WANG Y G，SONG D D，ZHANG F Y，et al.Experiment study on the variation rules of electrical resistivity on being loaded gas-filled coal［J］.Journal of Henan Polytechnic University（Natural Science），2024，43（2）：8-14.

三轴压缩下含瓦斯煤体电阻率响应的实验研究

王云刚1，2，3，宋代东1，2，3，张飞燕1，2，3，李东会1，2，3

1.河南理工大学 安全工程实验示范中心，河南 焦作 454000；2.河南理工大学 河南省瓦斯地质与瓦斯治理省部共建国家重点实验室培育基地，河南 焦作 454000；3.河南理工大学 煤炭安全生产河南省协同创新中心，河南 焦作454000

摘要: 目的 受载含瓦斯煤体变形破裂过程中电阻率的变化规律是电阻率法预测预报煤与瓦斯突出发生的理论基础。因此，研究三轴压缩条件下含瓦斯煤体破裂过程中电阻率的变化规律十分必要。方法自主研发一套测试低频条件下受载含瓦斯煤体变形破坏过程中电阻率的实验系统，测试三轴压缩条件下含瓦斯煤体电阻率的变化规律，对实验结果进行分析和解释。 结果 结果表明：（1）受载含瓦斯煤体的电阻率变化与所受应力存在显著的对应关系，型煤的电阻率变化规律与应力的对应关系要优于原煤的，对应力降低比较敏感；（2）受载型煤的电阻率变化规律为先上升后下降型和下降型，受载原煤的电阻率变化规律仅有下降型；（3）从原煤和型煤的物理力学以及受载过程中的变形破坏类型、受载含瓦斯煤体变形破坏过程中的煤体结构变化情况、煤的孔隙结构以及导电类型3方面分析解释受载含瓦斯煤体的电阻率变化情况；（4）对受载含瓦斯型煤电阻率变化曲线出现的2种类型进行科学合理的解释。结论 研究成果可为电阻率法预测预报煤与瓦斯突出的发生提供技术支撑。

关键词:含瓦斯煤体；电阻率；三轴压缩；煤与瓦斯突出

doi:10.16186/j.cnki.1673-9787.2023020030

基金项目:国家自然科学基金资助项目（U1704129，51974108）

收稿日期: 2023/02/11

修回日期: 2023/10/10

出版日期:2024/03/25

Experiment study on the variation rules of electrical resistivity on being loaded gas-filled coal

WANG Yungang1，2，3，SONG Daidong1，2，3，ZHANG Feiyan1，2，3，LI Donghui1，2，3

1.Safety Engineering Experimental Demonstration Center，Henan Polytechnic University，Jiaozuo 454000，Henan，China；2.State Key Laboratory Cultivation Base for Gas Geology and Gas Control，Henan Polytechnic University，Jiaozuo 454000，Henan，China；3.Collaborative Innovation Center of Coal Work Safety，Henan Polytechnic University，Jiaozuo 454000，Henan，China

Abstract: Objectives The variation law of electrical resistivity in the process of deformation and fracture of loaded gas-bearing coal is the theoretical basis for the prediction of dynamic disasters of coal or rock in coal mines with electrical resistivity method.Therefore，it is necessary to investigate the variation law of electrical resistivity of loaded gas-containing coal. Methods The triaxial experimental system for electrical resistivity of gas-containing coal was established under low frequency conditions.And the resistivity variation law of loaded coal containing gas was investigated. Results The experimental results show that：（1）there is a relationship between the electrical resistivity and the loaded stress，and the corresponding relationship of shaped coal samples and the stress is better than that of the primary structure coal samples；（2）there are two types of electrical resistivity change law for loaded shaped coal samples， only one type of electrical resistivity change law for the loaded primary structure coal samples；（3）the reasons is analyzed for the different electrical resistivity variation between the shaped coal samples and the primary structure coal samples through the deformation and failure types of loaded coal；（4）the two types of resistivity change curves of loaded coal are explained scientifically and rationally in terms of force deformation of coal macromolecular structure. Conclusions The research results can provide technical support for applying the electrical resistivity method to predict and early warn the occurrence of coal and gas outburst.

Key words:coal containing gas；electrical resistivity；triaxial compression；coal or rock dynamic disaster