井下定向长钻孔技术在盾构巷道超前探查中应用

Application of Underground Directional Long Drilling Technology in Advanced Exploration of Shield Roadway

为保证巷道安全高效施工,在不影响盾构施工的情况下,采用井下定向长钻孔技术对施工区域进行超前探查。工程实践表明,通过施工定向长钻孔及分支孔,查明了研究区地层岩性、煤层赋存位置、构造发育状况及水文地质条件,得出了研究区内岩层富水性较弱,无导水构造,地层整体相对完整的结论,总结了定向长钻孔施工过程中存在的问题,并给出了相应对策。

To ensure the safe and efficient construction of the roadway,the downhole directional long drilling technology is used to conduct advance exploration of the construction area without affecting the shield construction.Engineering practice shows that through the construction of directional long boreholes and branch holes,the geological lithology,coal seam occurrence location,structural development status,and hydrogeological conditions of the study area are identified.It is concluded that the water abundance of the rock strata in the study area is weak,there is no water conducting structure,and the overall formation is relatively complete.The problems existing in the construction process of directional long drilling are summarized,and corresponding countermeasures are proposed.