近距离顶板灰岩富水性探测与突水危险性研究

Detection of Water Abundance of Short-interval Roof Limestone and Research on Water Inrush Risk

针对某矿1102工作面近距离顶板灰岩含水层是否具有突水危险性,采用瞬变电磁探测和UDEC数值模拟的方法,就顶板灰岩富水性分区及覆岩结构稳定性、导水裂隙发育特征进行了深入研究。研究结果表明：①顶板灰岩含水层有2处含水较强区,1处含水中等区,2处含水中等偏弱区。②1煤上覆岩层裂隙发育集中在采空区后方、前方煤壁处及工作面中部离层区。裂隙发育高度随采空区跨度增加而增大,两者呈非线性关系。开挖40-120 m时,裂隙发育高度突增;开挖70 m、裂隙高度为22 m时发展至灰岩含水层。③15 m厚砂岩充当了隔水层,工作面突水危险性较小。④采用新型化学注浆堵水材料——改性脲醛树脂,成功进行了工作面防治水试验,效果显著。

To counter to the situation whether the water inrush hazard existed or not in the short- interval roof limestone aquifer in 1102 working face in a mine,deep study was carried out on the division of the water abundance zone in the roof limestone,the stability of overburden rock structure and the development characteristics of the water flowing fractures with transient electromagnetic detection method and UDEC numerical simulation method. The study results showed that： ① The roof limestone aquifer has two strong water-bearing zones,one moderate water-bearing zone and two weak water-bearing zones; ②The developed fractures in the overburden rock of coal 1 concentrated in the backside of the mined-out area,the front coal wall and the middle bed-separation zone of the working face,the fracture developmental height nonlinearly increased with the increase of the gob span,the fracture developmental height increased suddenly in 40 ~ 120 m eavation,the fractures developed to the limestone aquifer in 70 m excavation and 22 m development height; ③ 15m-thick sandstone acted as a water-resisting layer,and less water inrush hazard existed in the working face; ④A new chemical grouting material- the modified urea formaldehyde resin was successfully applied for the water control test in the working face and remarkable effect was obtained.