Abstract Gas and coal spontaneous combustion (CSC) compound disasters have become a common mode of serious accidents in coal mines. This study is aimed at revealing the characteristics of such compound disasters in the gob of Y-type ventilation fully mechanized top coal caving face with a high-level drainage roadway (HLDR) (hereafter referred to as “Y+HLDR” working face) and providing a theoretical basis for disaster prevention and control. With the W1310 fully mechanized working face of Gaohe Coal Mine taken as the research background, the distribution law of gas concentration field in the gob of the “Y+HLDR” ventilation mode under different air supply conditions was numerically simulated with the aid of COMSOL, and the area of gas and CSC compound disaster in the gob was divided quantitatively. The results show that data obtained from the field experiment coincide with the simulation results, which verifies the effectiveness of the simulation; Meanwhile, with the increase of air supply volume, the gas concentration near the working face is significantly reduced, and high-concentration gas is transferred to the deep part of the gob. The area where CSC induces gas explosions is divided by superimposing the gas and oxygen concentration fields that meet the conditions of compound disaster occurrence on the gob floor. It is concluded that the range of area with compound disaster risk is positively correlated with the air supply volume. The results of the simulation provide important theoretical guidance for the prevention and control of gob disasters.

中文翻译：

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Y型通风放落工作面采空区煤自燃研究：案例研究

摘要 瓦斯煤自燃（CSC）复合灾害已成为煤矿严重事故的常见模式。本研究旨在揭示Y型通风综放工作面高放巷（HLDR）采空区（以下简称“Y+HLDR”工作面）采空区此类复合灾害特征，为灾害防治提供理论依据。以高河煤矿W1310综采工作面为研究背景，借助COMSOL对不同送风条件下“Y+HLDR”通风模式采空区瓦斯浓度场分布规律进行数值模拟，定量划分了采空区瓦斯和CSC复合灾害区域。结果表明，现场试验数据与模拟结果吻合，验证了模拟的有效性；同时，随着送风量的增加，工作面附近瓦斯浓度显着降低，高浓度瓦斯向采空区深部转移。通过在采空区叠加满足复合灾害发生条件的气体和氧气浓度场，划分出CSC诱发瓦斯爆炸的区域。得出复合灾害风险区域范围与供气量呈正相关。模拟结果为采空区灾害防治提供了重要的理论指导。验证模拟的有效性；同时，随着送风量的增加，工作面附近瓦斯浓度显着降低，高浓度瓦斯向采空区深部转移。通过在采空区叠加满足复合灾害发生条件的气体和氧气浓度场，划分出CSC诱发瓦斯爆炸的区域。得出复合灾害风险区域范围与供气量呈正相关。模拟结果为采空区灾害防治提供了重要的理论指导。验证模拟的有效性；同时，随着送风量的增加，工作面附近瓦斯浓度显着降低，高浓度瓦斯向采空区深部转移。通过在采空区叠加满足复合灾害发生条件的气体和氧气浓度场，划分出CSC诱发瓦斯爆炸的区域。得出复合灾害风险区域范围与供气量呈正相关。模拟结果为采空区灾害防治提供了重要的理论指导。高浓度气体被输送到采空区的深处。通过在采空区叠加满足复合灾害发生条件的气体和氧气浓度场，划分出CSC诱发瓦斯爆炸的区域。得出复合灾害风险区域范围与供气量呈正相关。模拟结果为采空区灾害防治提供了重要的理论指导。高浓度气体被输送到采空区的深处。通过在采空区叠加满足复合灾害发生条件的气体和氧气浓度场，划分出CSC诱发瓦斯爆炸的区域。得出复合灾害风险区域范围与供气量呈正相关。模拟结果为采空区灾害防治提供了重要的理论指导。