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为了治理新疆苇湖梁煤矿急倾斜大段高综放工作面采空区的瓦斯隐患,在实验室依据几何相似准则,按1∶100比例制作了采场模型,并依据流动相似理论的欧拉相似准数来确定采空区回采工作面风量及工作面两端压差,实验中以高纯氮气作为指标性气体来模拟采空区的瓦斯随工作面变化的情况.针对回采作业的初采阶段、放顶煤阶段以及顶板垮落阶段采空区的空间形态,试验得到采空区内指标性气体在不同位置分布特征.据此分布特征规律,利用Fluent专业计算软件,模拟计算出矿井该回采工作面的瓦斯在采空区里流动分布情况,即在初采阶段采空区浓度为50%的瓦斯分布在工作面上部10m处,在放顶煤阶段这种高浓度瓦斯分布在工作面上部20m处,而在顶板垮落时,由于漏风而使高浓度瓦斯分布分散化.本研究结果对于现场进行瓦斯防治,特别是进行采空区瓦斯抽采提供了参数依据.图5,表3,参8.
In order to control the gas hidden danger in the gob of the fully mechanized top coal caving face in the steep inclined section of Weihuliang Coal Mine in Xinjiang, the stope model was made according to the geometrical similarity criterion according to the ratio of 1: 100 in the laboratory and according to the Eulerian quasi- To determine the amount of wind in the goaf mining face and the pressure difference between the two sides of the working face.In this experiment, high purity nitrogen gas was used as the indicator gas to simulate the change of the gas in the goaf with the working face.For the initial mining stage, The top coal caving stage and roof caving stage mined-out area, the test obtains the distribution characteristics of the indicator gas in the gob area at different positions.According to the distribution law, using Fluent professional calculation software to simulate the mining work Surface gas flow in the gob area distribution, that is, in the initial mining stage gob area concentration of 50% of the gas distribution in the upper part of the work surface 10m Department in the caving stage of this high concentration of gas distribution in the face of the upper 20m At the time of roof collapse, the high concentration gas distribution was dispersed due to the air leakage.The results of this study provided the parameters for gas prevention and control in the field, especially for gas drainage in the goaf According to Figure 5, Table 3, reference 8.