煤炭工程 ›› 2018, Vol. 50 ›› Issue (3): 71-74.doi: 10.11799/ce201803019

• 生产技术 • 上一篇    下一篇

基于多含水层放水试验的顶板水可疏降性评价

赵宝峰1,马莲净2   

  1. 1. 中国煤炭科工集团西安研究院有限公司
    2. 长安大学 环境科学与工程学院
  • 收稿日期:2017-05-15 修回日期:2017-06-30 出版日期:2018-03-20 发布日期:2018-04-26
  • 通讯作者: 赵宝峰 E-mail:zhaobaofeng@cctegxian.com

Drainage feasibility of water from coal roof based on dewatering test of multi-aquifer

  • Received:2017-05-15 Revised:2017-06-30 Online:2018-03-20 Published:2018-04-26

摘要: 为了对巷道掘进和工作面回采分别制定有针对性的防治水方案,通过对工作面顶板Ⅱ含水层和Ⅲ含水层分别开展放水试验,利用解析法计算了各含水层的水文地质参数,结合放水试验观测资料查明了Ⅱ含水层和Ⅲ含水层之间的水力联系,评价了各含水层的可疏降性。结果表明:威胁巷道掘进的Ⅲ含水层渗透性和富水性较强,同时与Ⅱ含水层的水力联系密切,巷道掘进期间Ⅲ含水层的可疏降性较差,可以采用对Ⅲ含水层注浆改造和局部疏水降压的防治水方案|与抽水试验相比,根据放水试验计算Ⅱ含水层的渗透系数较大,主要是由于钻探工艺、水跃和井损的影响,工作面在回采前可以对Ⅱ含水层采取长时间分散疏放和短时间集中疏放的防治水方案。对于顶板赋存多含水层的情况,可以利用放水试验探查工作面水害条件,评价各含水层的可疏降性,进而制定相应的防治水方案。

关键词: 多含水层, 放水试验, 渗透系数, 水力联系, 可疏降性

Abstract: In order to formulate water disaster prevention and control project for tunnel drivage and workingface mining, through the dewatering test of Ⅱ aquifer and Ⅲ aquifer on the roof, the hydrogeology parameters of each aquifer were calculated based on analytical method. Combined with observation data of dewatering test, the hydraulic connection between Ⅱ aquifer and Ⅲ aquifer was ascertain, and the drainage feasibility of each aquifer was evaluated. The results show that permeability and water-bearing of Ⅲ aquifer were good, and there is a close hydraulic connection between Ⅱ aquifer and Ⅲ aquifer . The drainage fesibility of Ⅲ aquifer is poor during tunnel drivage, the grouting transformation of roof aquifer and local drainage groundwater can be used to prevent and control water disaster. Compared with the pumping test, the permeability coefficient of Ⅱaquifer is bigger based on dewatering test, this result is mainly due to the drilling process, the influence of hydraulic jump and well loss. Long time dispersing drainage and short time concentrated drainage can be used before working face mining. In the case of multi-aquifer on the roof of coal seam, dewatering test can be used to explorate the condition of water disaster of working face, then, drainage feasibility was evaluated, and corresponding water disaster prevention method was formulated.

中图分类号: