论文部分内容阅读
针对深井高瓦斯低透气性煤层群的典型赋存特征,结合淮南矿区千米深井无煤柱煤与瓦斯工程实践,提出了改进Y型通风模式,即分阶段沿空留巷方法,完善了对共采工程的维控预应力锚固技术.工程实践表明:预应力锚固技术可以实现深井强动压开采过程中对沿空留巷和回风巷道围岩稳定的有效维控,至第1阶段结束,留巷顶板下沉量为144mm,两帮移近量为351mm,分阶段沿空留巷对共采巷道的维护时间缩短了4/5.减少了留巷变形速度稳定后累计变形的不利影响.超前工作面布置的瓦斯抽采工程中,单孔抽采瓦斯浓度(体积分数)达到40%,实现了煤与瓦斯共采.
Aiming at the typical occurrence characteristics of high-gas and low-permeability coal seams in deep-well and combined with the practice of non-coal-column coal and gas engineering in kilometers of deep mine in Huainan mining area, an improved Y-type ventilation mode is proposed, that is, Dimensional control of prestressed anchorage technology in common mining project.The engineering practice shows that prestressed anchoring technology can effectively maintain and control the stability of surrounding rock of gob-side entry and return airways in the process of strong dynamic pressure mining in deep well until the end of the first phase , The amount of roof subsidence is 144mm, the amount of two approaches is 351mm, and the maintenance time of total roadway is shortened by 4/5 by phased gob-side entry. This reduces the unfavorable effects of cumulative deformation when the deformation speed of retaining lane is stable In the methane drainage project arranged ahead of the working face, the gas concentration (volume fraction) of single-hole gas drainage reaches 40%, realizing the common mining of coal and gas.