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为深入分析保护层开采的实施效果,依据煤岩卸压变形理论和瓦斯运移特性,建立保护层开采测评指标体系,并选择淮南矿区对指标现场应用方法进行分析。研究结果表明:测评体系包括保护范围和保护效果两部分,其中,瓦斯压力、瓦斯含量、煤层透气性系数、煤层顶底板相对变形、瓦斯抽放量、突出指标的变化等因素可作为效果考察的现场测评指标。保护层开采后,应首先明确其保护范围,然后再对保护效果分别从煤体力学特性、煤层瓦斯特性和煤层开采动力特性3方面进行综合分析,按照现场实测值与指标临界值的对比,即可系统地定量评价保护层开采的效果。
In order to deeply analyze the implementation effect of protective layer mining, according to the theory of pressure relief and deformation of coal and gas and gas migration characteristics, the index system of protective layer mining was set up, and the application method of index in Huainan mining area was selected. The results show that the evaluation system includes two parts: the scope of protection and the protection effect. Among them, factors such as gas pressure, gas content, permeability coefficient of coal seam, relative deformation of roof and floor of coal seam, gas drainage amount and salient index can be considered as effects Site evaluation index. After the protective layer is mined, the scope of its protection should be clarified first, and then the protective effect should be comprehensively analyzed from the mechanical properties of coal, the gas characteristics of coal seam and the dynamic characteristics of coal seam mining. According to the comparison between the actual measured value and the critical value, The effect of protective layer mining can be systematically and quantitatively evaluated.