立井“疏-堵-固”快速揭穿突出煤层综合施工技术

发布时间：2018-11-21 13:49

【摘要】：结合首山一矿立井揭煤实际情况,提出了"疏-堵-固"快速揭煤综合施工技术,即:在井筒布置6圈钻孔和1个中心孔,孔底间距3m,控制井筒掘进断面轮廓线外12m区域范围内戊9-10煤层。采用煤岩体钻孔封孔剂把第1圈钻孔和中心孔封孔并安装压力表,揭煤爆破前全过程监测煤体瓦斯压力变化情况;第6、第5、第4圈钻孔施工完毕后安装抽放管及封孔器;施工完第3、第2圈钻孔,安设加工好的金属骨架连接注浆专用封孔器封孔;第6至第2圈钻孔按要求完成封孔后,联网抽放瓦斯;瓦斯抽放结束后,利用第3、第2圈金属骨架进行预注浆联合支护加固煤体。该技术堵截了煤层及瓦斯向井筒工作面位移和溢出,增强了井筒周围煤(岩)体的承载能力、整体性和稳定性,提高了井筒揭过突出煤层时的安全系数。
[Abstract]:Combined with the actual situation of coal uncovering in the shaft of Shoushan No. 1 Mine, the comprehensive construction technology of "thin-blocking-solid" quick uncovering coal is put forward, that is, six holes and one central hole are arranged in the wellbore, and the spacing between the holes and the bottom is 3 m. Control of coal seam Wu9-10 within 12 m area outside cross section profile of shaft excavation. The pressure gauge is installed in the first circle and the center hole to monitor the change of coal body gas pressure before the coal blasting, the sixth, the fifth and the fourth cycles are used to install the drainage pipe and the hole sealing device after the construction of the drilling holes in the sixth, fifth and fourth circles. At the end of the third and second circles, the holes of the special hole sealing device with metal skeleton connection grouting are installed, the holes of the sixth to the second circles are sealed according to the requirements, and the gas is drained through the network; After gas drainage is finished, the third and second ring metal skeleton is used to reinforce coal body with pre-grouting combined support. The technology has blocked the displacement and overflow of coal seam and gas to wellbore face, enhanced the bearing capacity, integrity and stability of coal (rock) body around the shaft, and improved the safety factor when the coal seam is exposed to outburst in the wellbore.
【作者单位】：平煤神马建工集团有限公司建井三处;
【分类号】：TD713.3

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