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针对综放面顶板初次垮落步距增大,造成工作面初采期瓦斯超限的技术难题,本文提出了采用顶板预裂法治理综放面初采期瓦斯的技术方案,并利用流体力学计算软件Fluent对不同模拟方案下采空区和工作面瓦斯浓度分布进行了模拟试验,得出了不同悬顶距条件下采空区瓦斯分布规律以及顶板预裂措施对初采期瓦斯的治理效果,研究结果表明,采用顶板预裂措施治理高瓦斯工作面初采期瓦斯超限问题是有效可行的,为现场试验提供了指导依据.
In view of the technical problem that the initial caving step of roof of fully mechanized coal caving face increases and the gas overrun in the initial mining face of working face is caused, this paper puts forward the technical scheme of adopting the method of roof pre- The calculation software Fluent simulates the distribution of gas concentration in goafs and working face under different simulation schemes. The gas distribution law of goaf under different canopies and the control effect of roof precaution on gas at initial mining stage are obtained The results show that it is feasible and feasible to adopt the method of roof pre-cracking to control the gas overrun in the first mining of high-gas coalface, which provides the basis for field test.