下保护层回采对上覆煤层瓦斯压力动态监测工程实践

The engineering practice of dynamic monitoring of gas pressure in overlying coal seam by lower protective layer

为了揭示下保护层回采时对上覆煤层瓦斯压力的演化规律,保证煤层在回采设计及采掘接替的正常进行,在保护层工作面回采过程中对超前及侧向区域上覆煤层的瓦斯压力演化规律进行实时在线监测。监测结果表明,在采面回采中动压区的抽采浓度上升充分体现出区段岩石保护层开采对上覆煤层具有保护作用,采面老顶全部跨落后,体现的更加明显,符合保护层开采的实际情况,为煤层安全回采的进行提供了保障。

In order to reveal the“time-air-strength”evolution law of gas pressure in the overlying coal seam during the mining of the lower protective layer,and ensure the normal mining design and mining replacement of the coal seam,real-time online monitoring is conducted for the gas pressure evolution law of the overlying coal seam in advance and lateral areas during the mining of the working face of the protective layer.The monitoring results show that the rising of the extraction concentration in the dynamic pressure zone in the mining surface fully reflects the liberating effect of the section rock protective layer mining on the overlying coal seam,and the old top of the mining surface is more obvious,which is in line with the actual situation of the protective layer mining and provides a guarantee for the safe mining of the coal seam.