含不透气夹矸煤层瓦斯放散特征与模型研究  

Research on gas release characteristics and model of coal seam containing non-breathable layer

作　　者：赵洪宝[1,2] 李金雨 王涛 程辉[1] 刘一洪[1] 黄轶凡 任朝朋[1] ZHAO Hongbao;LI Jinyu;WANG Tao;CHENG Hui;LIU Yihong;HUANG Yifan;REN Chaopeng(School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Key Laboratory of Mine Geological Hazards Mechanism and Control,Xi’an,Shaanxi 710054,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083 [2]矿山地质灾害成灾机理与防控重点实验室,陕西西安710054

出　　处：《中国矿业大学学报》2020年第5期826-834,873,共10页Journal of China University of Mining & Technology

基　　金：越崎杰出学者资助项目(800015Z1179);国家自然科学基金项目(51474220);中央基本科研业务费项目(2009QZ03)。

摘　　要：为探究含不透气夹矸煤层瓦斯的放散特征与模型,利用自主研发的"一种基于密封腔内加恒压的瓦斯试验装置"对大小和位置不同的不透气夹矸层对煤层瓦斯放散特性的影响进行了系统研究,并对其影响机理进行了分析,提出了含不透气夹矸层的瓦斯放散模型及数学表达.结果表明:不透气夹矸的存在对煤层瓦斯放散起到一定的抑制作用,但不会改变瓦斯放散的整体规律;不透气夹矸的大小和位置均对瓦斯的放散特征有影响.具体表现为:夹矸面积越大,夹矸位置越靠近放散面,对瓦斯放散的抑制作用越大;含不透气夹矸煤层的瓦斯放散过程符合"两腔"放散模型;本文提出的模型数学表达式和放散速度强可以较好地描述"两腔"放散模型的放散特征.从"两腔"放散模型的放散机理来讲,夹矸面积越大,流动通道的面积越小,夹矸越靠近放散面,放散腔体积越小,补充腔体积越大,其对瓦斯放散抑制作用越大.In order to explore the release characteristics and model of coal seam containing non-breathable layer, "gas test device based on constant pressure inside sealed chamber" was invented independently to research the influence of non-breathable layer with different sizes and locations on coal seam gas release characteristics, the influencing mechanism was analyzed in depth, and gas release model and mathematical expressions with non-breathable layer coal seam were proposed. The results show that the presence of non-breathable layer has a certain inhibitory effect on coal seam gas release, but it can not change the overall law of gas release. The size and position of the non-breathable layer have an effect on the release characteristics of the gas. The specific performance is as follows: the larger non-breathable layer and the closer the non-breathable layer position is to the releasing surface, the greater the inhibition effect on the gas release. The gas release process of the coal seam containing non-breathable layer is consistent with the "two-cavity" release model, the mathematical expression of the model and the factor of the release velocity can better describe the release characteristics of the "two-chamber" release model. From the release mechanism of the "two-chamber" release model, the larger area of the non-breathable layer, the smaller the area of the flow channel is. And the closer the non-breathable layer to the releasing surface, the smaller the volume of the dispersing cavity is. The larger the volume of the replenishing cavity, the greater the inhibition effect on the gas release is.

关 键 词：不透气夹矸 夹矸大小 夹矸位置 放散模型 等效表征 

分 类 号：TD712[矿业工程—矿井通风与安全]