保安煤矿西翼3煤层开采安全性研究

Study on Extraction Security of No.3 Coal Seam in West Wing of Baoan Coalmine

通过对矿区水文地质条件的分析,认为开采3煤层时的主要充水含水层为顶板砂岩裂隙水和底板奥灰水,以奥灰水最为突出。采用突水系数法及阻水系数法计算煤矿西翼3煤层开采的有效隔水层厚度为37.6m,运用大井法计算工作面开采过程中最大涌水量为98.3m3/h。研究认为:工作面可以进行带压开采,在巷道和工作面开拓中必须在井下施工探放水孔,在富水区进行疏水降压,达到安全开采的目的;开采F20、F35断层附近时应留足防水煤柱,并对奥灰进行疏水降压,以免发生突水事故。

Through mine area hydrogeological condition analysis, considered that main water filling aquifers during the extraction of No.3 coal seam are roof sandstone fissure water and floor Ordovician limestone karstic water, especially the later. To use water bursting coefficient method and water resistance coefficient method estimated effective confining bed thickness is 37.6m during the extraction of No.3 coal seam in west wing of the coalmine, to use ＂virtual large diameter well＂ method estimated maximum water inflow is 98.3m2/h during the working face extraction. The study has worked out： mining under safe water pressure of aquifer is allowed on working faces, in development of roadways and working faces have to drill underground drainage boreholes, dewatering and pressure relief are needed in water rich zones to gain safety production object. During the mining near F20 and F35 faults adequate safety pillar against water and Ordovician limestone aquifer dewatering and pressure relief are needed, to avoid water bursting accident.