在煤矿无煤柱开采过程中,采煤工作面及其作业空间往往因处于空气压能相对低位,受到邻近采空区内瓦斯等有害气体侵入的威胁.通过研究和实施气室连通管调压技术,合理改变采煤工作面邻近老空区外围的压能关系,调控老空区瓦斯涌出方向和涌出量,有效阻止老空区高浓度瓦斯侵入回采工作面作业空间.%With respect to the pillarless mining operations, the mining district and its working faces were very much prone to the exposure of harmful gases originated from the adjoining goaf as the pressure energy at the mining district was relatively lower. Given this a gas chamber piping system was proposed where the ventilation system was not allowed to be adjusted or such regulations were not favorable. To be specific, auxiliary retaining walls were to be constructed to form a gas chamber along with the original goaf retaining wall located in the air intake roadway. A piping system then could be used to release harmful gases through the auxiliary retaining wall to the main air return roadway. The pressure energy distribution around the goaf would be properly regulated to increase the pressure energy of working area nearby the goaf,at the same time, the gas density of the main air return was lower than the limit and not causing coal spontaneous combustion. In this way harmful gases trapped in the gas chamber could be released through the underground ventilation system. This method was successfully implemented at Kongzhuang Coal Mine and the results proved to be satisfactory. The goaf gas risks were dramatically reduced and mining safety was ensured to the maximum extent.
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