摘要
放顶煤开采时其导水裂隙带发育高度大于煤层顶板到白垩系宜君组含水层底部距离,在工作面薄弱处可能波及至洛河组含水层,工作面面临顶板水害威胁。对此,利用"大井法"进行工作面涌水量计算,考虑回采安全,正常涌水量按400 m3/h、最大涌水量按800 m3/h进行工作面水仓及排水系统的设计。
In the top-coal caving mining,the height of water flowing fractured zone is greater than the distance from the roof of coal seam to the bottom of the Cretaceous Yijun group aquifer,and the weak point of the mining face may be threatened by Luohe group aquifer. Therefore,the water inflow of working face was calculated with the big well method. Considering safety mining,the water sump and drainage system for working face was designed according to the standard that the normal water inflow is 400m^3/h and the maximum water inflow is 800m^3/h,.
出处
《陕西煤炭》
2017年第3期29-32,共4页
Shaanxi Coal
关键词
防治水
导水裂隙带
顶板水害
涌水量
water prevention and control
water flowing fracture zone
roof water gush
water inflow
