综放工作面瓦斯运移模拟分析

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英文篇名：Simulation and Analysis of Gas Migration in Fully-mechanized Caving Face 作者：常俊俊 英文作者：CHANG Jun-jun;Shanxi Xinjing Coal Industry Co.,Ltd.; 关键词：达西定律 ; 瓦斯运移 ; 综放工作面 英文关键词：Darcy's law;;gas migration;;fully-mechanized caving face 中文刊名：META 英文刊名：Coal Science & Technology Magazine 机构：山西新景矿煤业有限责任公司; 出版日期：2019-04-25 出版单位：煤炭科技 年：2019 期：v.40;No.158 语种：中文; 页：META201902007 页数：3 CN：02 ISSN：32-1491/TD 分类号：23-25

摘要

根据多孔介质的渗流规律——达西定律,建立符合某矿现场实际情况的实验室模型,以便直观地分析综放工作面对采空区瓦斯的运移影响。模型建立过程中,就U、U+I和U+L三种通风方式分别进行模拟分析,分析采空区的瓦斯运移及分布规律,同时对综放工作面的采空区内风流情况一并分析。模拟分析表明:不同的通风方式,不仅对采空区内的瓦斯分布及运移造成一定的影响,同时在一定程度上影响着采空区内的风流,使得采空区内风流紊乱,瓦斯局部地区集聚严重;模拟发现:综放工作面的新鲜风流如果过小,极易造成工作面和采空区内的瓦斯集聚,而较大的风流又在一定程度上影响着采空区的瓦斯浓度,而将风流速度控制在1. 5～3. 0 m/s的情况下,能够较好地控制综放工作面的瓦斯浓度,减少瓦斯集聚现象的发生。
        According to Darcy's law of porous media seepage, a laboratory model was established to analyze the effect of fully-mechanized caving face on gas migration in goaf. In the process of establishing the model, three ventilation modes, U, U+I and U + L, were simulated and analyzed respectively. The gas migration and distribution in goaf were analyzed, and the air flow in goaf of fully-mechanized caving face was also analyzed. The simulation analysis showed that different ventilation modes not only affect the distribution and migration of gas in goaf, but also affect the air flow in goaf to a certain extent, which makes the air flow disorder in goaf and agglomeration of gas in part of goaf serious. The simulation results showed that if the fresh air flow in fully-mechanized caving face is too small, it is easy to cause gas accumulation in working face and goaf. The gas concentration in goaf is affected to a certain extent by larger air flow, and the gas concentration in fully-mechanized caving face can be well controlled by controlling the air flow velocity at 1. 5 ～ 3. 0 m/s to reduce the occurrence of gas accumulation.

引文

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