漳河水库下厚煤层综放开采技术研究

Study on Fully Mechanized Top Coal Caving Mining Technology of Thick Seam Under Zhanghe Reservoir

为保障五阳煤矿7802工作面漳河水库下厚煤层综采放顶煤安全开采,研究综放开采导水裂缝带高度发育规律,探讨了综放采场覆岩结构破坏及采动渗透性间关系,计算了水库下综放开采安全所需防水煤柱高度,制定相应的防治水技术措施。结果表明:中至坚硬覆岩综放开采导水裂缝带发育高度基本与煤层一次采高成正比,比例系数为20.22;煤层顶板基岩厚度大于水库下安全开采所需煤柱高度;监测知井下工作面涌水与地表水体没有水力联系,实现水库下压煤安全开采。

In order to protect safety mining of No. 7802 fully mechanized top coal caving mining face of Wuyang Mine under Zhanghe res-ervoir, the paper studied the height development law of the water flow crack zone in the fully mechanized top coal caving mining, dis- cussed the relationship between the overburden strata structure failure and the mining permeability of the fully mechanized top coal caving mining face, calculated the height of the waterproof safety pillar required for the fully mechanized top coal caving mining under the reser-voir and set up the related waterproof and control technical measures. The results showed that the development height of the water flow crack zone in the medium and hard strata above the fully mechanized top coal caving mining face would be basically direct proportion to the one passing cutting height of the seam and the percentage coefficient was 20. 22. The base rock thickness of the roof above the seam was higher than the height of the safety pillar required for the mining under the reservoir. The monitoring and nearing results showed that the water inrush in the coal mining face would have no relationship with the surface ground water and the high production and high efficient safety mining under the reservoir could be realized.