摘要
为准确识别瓦斯涌出前兆信号,利用含瓦斯煤渗流试验系统开展不同加载速度条件下的含瓦斯煤受载破坏试验,分析不同加载速度条件下应力-瓦斯涌出特征,根据临界慢化理论研究煤体破坏过程中瓦斯涌出特征。结果表明:不同加载速度条件下的瓦斯涌出随应力的增大表现出先减小后增多的特征,且煤体破坏前瓦斯涌出有明显的升高特征;随着加载速度的提高,瓦斯涌出的上升趋势越来越超前于煤体破坏;煤体在破坏前表现出瓦斯涌出的方差、自相关系数增大的临界慢化特征,窗口长度、滞后步长取值大一些有利于含瓦斯煤破坏前兆的精准识别。
In order to accurately identify precursory signals of gas emission,failure tests of coal containing gas under different loading speed were carried out by using gassy coal seepage test system.Stress-gas emission law for different loading speed was analyzed,and gas emission characteristics in process of coal failure were studied according to critical slowing down theory.The results show that gas emission decreases first and then increases along with increase of stress for different loading speed,and before coal failure,gas emission rises obviously whose rising trend is more and more ahead of coal destruction when loading speed improves.Moreover,before coal failure,its gas emission shows characteristics of critical slowing down of variance and autocorrelation coefficient,and relatively larger window length and hysteresis step are conducive to accurately identifying failure signals of coal containing gas.
作者
陈亮
王恩元
CHEN Liang;WANG Enyuan(School of Energy&Environment Engineering,Zhongyuan University of Technology,Zhengzhou Henan 450007,China;State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Henan Polytechnic University,Jiaozuo Henan 454000,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou Jiangsu 221006,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2020年第12期79-84,共6页
China Safety Science Journal
基金
国家自然科学基金资助(51804356)
河南省瓦斯地质与瓦斯治理重点实验室—省部共建国家重点实验室培育基地开放基金资助(WS2018B07)
河南省高等学校重点科研项目(18A440006)
中原工学院青年骨干教师项目(2020XQG04)。
关键词
受载破坏
瓦斯涌出
加载速度
应力
临界慢化
loaded destruction
gas emission
loading speed
stress
critical slowing down
