川藏铁路3000 m水平定向钻井技术方案

Technical plan for 3000m long horizontal directional drillingfor SichuanTibet Railway

摘要:

川藏铁路设计多条超长深埋隧道，且多处于高海拔、高陡斜坡及雪线以上的无人山区，地形险峻，起伏大，交通条件差。沿隧道轴线的水平定向钻井为隧道勘察提供了一种有效的勘察手段。结合工程及地层特点，从钻井设备、工艺等方面，为超长隧道勘察提供了一种3000 m级水平定向钻井技术方案。方案明确了井身结构、全面钻进和长钻程取心钻进工艺、钻井液措施及部分复杂情况应对措施。以较少的钻探工作量，为隧道勘察提供更加详细的实物地质资料，真实反映隧道内的地质情况。

Abstract:

Many deep buried super long tunnels are designed for the SichuanTibet Railway line, and most of them are located in high altitude, high steep slope and no man mountain zones above the snow line, where the terrain is steep and undulating, and the traffic conditions are poor. Horizontal directional drilling along the tunnel axis provides an effective method for tunnel investigation. In view of the engineering and geological characteristics, this paper provides a 3000m capacity horizontal directional drilling plan for super long tunnel investigation in terms of equipment and technology. The hole profile is specified in the plan together with full face drilling and coring drilling technology, drilling fluid measures and some measures for complex situations. With less amount of drill work, the plan provides more detailed physical geological data for tunnel investigation, hence the true characterization of the geological conditions in the tunnel.