新安煤田矿井充水条件时空变化规律研究

Spatial-temporal variation rules of mine water filling condition in Xin'an Coalfield

为了科学制定防治水对策,以区域水文地质条件时空差异为基础,并利用采矿对围岩的破坏规律,研究了新安煤田矿井充水条件的时空差异与变化规律。结果表明:水库蓄水后,49. 5km2煤田和库区内小煤矿直接被淹;奥灰水压最多可提高0. 2～0. 5MPa,奥灰突水风险有所增加。顶板砂岩水与底板太灰水在首采工作面充水作用较强,随后逐渐被疏干;奥灰含水层随着开采区域形成降落漏斗而突水风险降低。煤田东部小窑水受水库水补给,没有可疏性;而西部不受补给,具有可疏性。煤田浅部与小煤矿采空区相邻地段,小窑水威胁采掘与矿井安全;向深部,底板隔水层承受的奥灰水压增加,突水危险性增大。奥灰含水层的折向汇流区富水性强、径流集中,突水风险高、治理难度大,是奥灰水防治的重点区域。

Abstract： In order to formulate a scientific water control measures, based on the spatial-temporal differences of regional hydrogeological condition, and using the laws of mining damaged to the surrounding rock, the spatial-temporal differences and variation rules of mine water filling condition in Xin＇ an Coalfield were investigated. The results indicate that 49. 5km2 coalfield and small mines were directly submerged in reservoir area after reservoir storage, and hydraulic pressure of Ordovician karst aquifer increased 0.2 ~ 0. 5MPa, and its water inrush risk also increased; The water filling function of roof sandstone aquifers and floor Carboniferous limestone aquifer are strong in first mining face and gradually decrease; The water inrush risk of Ordovician karst water decreases along with the depression cone gradually formed; The goaf water of small mines in east area can＇t discharged on account of supplied by reservoir, while the west area opposite; The goaf water threaten the mine safety in shallow coalfield, while the water inrush risk of Ordovician aquifer gradually increases and Ordovician karst water becomes the key dangerous factor; The confluence zone of Ordovician karst water is the highest water inrush risk area due to the rich-water property and strong run-off. The spatial-temporal differences and variation rules of mine water filling condition in Xin＇an Coalfield are the scientific basis for formulating the targeted water control countermeasures.