北京冯家峪铁矿坑道水平硬岩钻进技术实践

Technical Practice of Horizontal Hard Rock Drilling in Beijing Fengjiayu Iron Mine Tunnel

摘要:

北京冯家峪铁矿地层坚硬致密、研磨性较弱、构造发育、易造斜、岩性复杂，坑道水平钻进中钻孔倾角变化范围较大（-55°～60°），上仰孔施工中冲洗液易沿着钻杆流出并对施工人员、钻机设备造成较大危害，硐内安全生产隐患较多，这些都给钻进施工带来了较大困难。对此，选用主机质量轻、所需安装空间小的Z7559型全液压钻机，选取满眼组合钻具，定制软胎体金刚石钻头；合理选用、调整冲洗液性能及泵量，正确调整钻进工艺参数；采取限制回次进尺、合理安装钻机等措施，确保工程质量和施工安全。对坚硬地层大倾角硐内水平钻进施工具有一定的借鉴意义。

Abstract:

The stratum was hard and compact with weak abrasiveness, stuctural development, easily inclining and complex lithology in Beijing Fengjiayu iron mine. The inclination angle change range was large (-55～60 ) in tunnel horizontal drilling; during upward hole construction, the flushing fluid was easy to outflow down along the drill pipe, which caused great harm to constructor and drilling equipment. The hidden dangers in the tunnel brought difficulities to drilling construction. Therefore, some measures were chosen to ensure construction quality and safety, such as selecting Z7559 full hydraulic drilling machine with light-weight main body and small installation space, full-packed assembly, custom-made soft matrix diamond bit, rational selection and adjustment of flushing fluid properties and pump volume, proper adjusting drilling parameters, restricting roundtrip meterage and reasonable installation of drilling machine.