含瓦斯煤岩构造界面剪切-渗流耦合试验方法及教学设计实践  

Experimental method and teaching design practice of shear-seepage coupling at the interface of gas-bearing coal-rock structure

作　　者：胡嘉英 邹光华[1] 徐祚卉 陈学习[1] 杨涛[1] 师皓宇[1] 周爱桃[3] HU Jiaying;ZOU Guanghua;XU Zuohui;CHEN Xuexi;YANG Tao;SHI Haoyu;ZHOU Aitao(College of Mine Safety,North China University of Science and Technology,Sanhe 0652011,China;School of Safety Engineering,North China University of Science and Technology,Sanhe 065201,China;School of Emergency Management and Safety Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]华北科技学院矿山安全学院,河北三河0652011 [2]华北科技学院安全工程学院,河北三河065201 [3]中国矿业大学(北京)应急管理与安全工程学院,北京100083

出　　处：《实验技术与管理》2024年第9期61-72,共12页Experimental Technology and Management

基　　金：河北省青年科学基金项目(E2024508014);中央高校基本科研业务费资助(3142024011)。

摘　　要：富含瓦斯的煤系断层/裂缝等地质构造界面结构在自然界煤岩体中广泛存在,含瓦斯煤岩构造界面剪切渗流耦合作用机制与煤系构造区域瓦斯动力灾害密切相关。基于此,该文介绍了含瓦斯煤岩构造界面剪切渗流耦合系统试验方法,重点分析了煤岩试样滑动界面的剪切力学特征,以及界面物理结构特征演化和高度表征方法。结果表明:煤岩界面剪切力学响应由煤层构造界面凸体承担,界面凸体强度越高峰值剪切强度越大,同时黏滑应力降增大但相应黏滑事件频率降低;其他条件一定时,增大法向应力使得煤岩构造界面剪切强度增大,能够积累更多的应变能,在剪切过程内黏滑次数更少,但是在达到阈值破裂失稳时会产生更大的应力降,释放更多能量。该研究成果可对探究含瓦斯煤岩界面剪切力学特性以及阐明含瓦斯煤岩构造界面动力失稳诱发灾害提供理论指导;同时该文将科研成果反哺教学,基于“试验系统—试验方法—结果分析—物理表征”相结合的方法,把科研理论和现场技术难题相结合,为产学研融合以及科研-教学协同提升提供相应的探索。[Objective]Faults and fractures are prevalent in coal seams and create zones that exhibit stress and gas anomalies and have a natural tendency toward instability owing to their“interface”physical structure characteristics.Geological structural zones become disaster-prone areas in coal mining.Shear slippage and gas flow at these structural interfaces during mining disturbances may play a dominant role in triggering coal and gas outbursts.Understanding the shear-seepage coupling characteristics at these interfaces is crucial for elucidating the mechanisms behind gas outbursts and for ensuring safe coal mining operations.[Methods]This study addresses frequent gas disaster issues at coal seam structural interfaces by conducting experiments on shear-seepage coupling systems involving gas-bearing coal-rock samples.This study primarily analyzed the shear mechanics of the coal-rock sample interfaces and the gas flow patterns.Using scanning electron microscopy and interface surface profile testing,the evolution of the physical structure characteristics during slippage was examined.A novel method for characterizing interface height was proposed to analyze the correlation between microscopic structural features and macroscopic shear mechanics,thereby clarifying the mechanism of interface slippage instability affecting coal and gas outbursts.[Results]The shear mechanical response at the coal-rock interface was primarily supported by the protuberances on the shear surface.During the shearing process,these protuberances undergo elastic deformation,shear wear destruction,and debris filling.At peak shear strength,protuberances experience substantial shear failure,resulting in a post-peak stress drop.Subsequent shear slippage processes lead to continuous local deformation and fracture of these protuberances,causing localized deformation damage on the shear surface and overall stick-slip instability.The study found that the peak stress drop and stick-slip stress drop increase with higher normal stress,while the frequency of st

关 键 词：构造界面 瓦斯 剪切-渗流耦合 瓦斯动力灾害 

分 类 号：TD712[矿业工程—矿井通风与安全]