直巷道中突出冲击气流的形成及传播特征研究  

Study of the Formation and Propagation Characteristics of Shock Wave and Gas Flow of Outburst at Straight Roadway

作　　者：王凯[1] 周爱桃[1] 魏高举[1] 张建方 

机构地区：[1]中国矿业大学资源与安全工程学院,北京100083 [2]液化空气(杭州)有限公司,浙江杭州310011

出　　处：《采矿与安全工程学报》2012年第4期559-563,共5页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51174212);教育部新世纪优秀人才支持计划项目(NCET-10-0724);中央高校基本科研业务费项目(2010QZ05)

摘　　要：煤与瓦斯突出产生的冲击气流有很强的破坏效应,首先分析了突出冲击气流的形成原因;然后建立了直巷道的几何结构模型,设定相应的初始条件与相关参数,对突出冲击气流的运动过程进行了数值模拟计算,得出了不同时刻的冲击气流压力、速度以及瓦斯相对质量浓度在巷道内的分布情况,同时分析突出发生区域出口断面处的冲击气流平均压力和速度随时间变化过程,并根据模拟结果得出定性与定量化的结论;最后,构建了煤与瓦斯突出在直巷中传播的实验系统,通过实验的手段分析了冲击波在直巷中衰减规律。研究结果表明,突出能在巷道空间内形成较高速度运动的冲击气流及冲击波;与突出区域原始瓦斯压力相比,冲击气流压力发生了急剧下降;冲击气流强度在断面不变的直巷道中传播会发生衰减,前期超压衰减较为缓慢,后期超压衰减增快。Shock waves and gas flow caused by outburst is destructive. Firstly, we analyzed the forma-tion process of outburst shock waves and gas flow. Then movement process of shock waves and gas flow was simulated by establishing geometrical model of the straight roadway and setting the initial conditions, and the pressure, speed of shock waves and gas flow, the relative concentration of gas dis-tribution at different times in the roadway were obtained. Simultaneously, average pressure and speed of shock waves and gas flow at different time in roadway were analyzed. From the simulation results, some qualitative and quantitative conclusions were obtained. Lastly, experimental system for outburst shock wave was constructed; shock wave propagation at straight roadway was studied by the experi- mental research. The results show gas flow and shock wave with higher speed can be formed induced by outburst; Compared with initial coal seam gas pressure, the pressure of gas flow and shock wave de-clines sharply. The intensity of gas flow and shock wave will attenuate at straight roadway, which de-cays more slowly earlierly, and attenuates faster in the late.

关 键 词：煤与瓦斯突出 冲击气流 数值模拟 实验研究 

分 类 号：TD324[矿业工程—矿井建设]