为弥补传统钻探勘察方法存在的不足，更加精确地对隧道围岩信息及岩体应力分布特征进行探测，提出将非开挖管道建设的水平定向钻进技术（HDD， horizontal directional drilling）用于隧道地质勘察的新方法，并给出采用HDD进行隧道地质勘察的详细技术方案，即先沿着隧道设计轴线钻1个水平定向钻勘察孔，并在孔内开展间断取心、水压致裂、综合测井和孔内电视等相关测试，利用测试结果对隧道设计轴线围岩的岩性变化、断裂破碎带分布范围以及隧道涌水情况进行精确判断。最后，将HDD用于天山胜利隧道地质勘察工程实例中，并在钻进长度为2 271 m的水平定向钻勘察孔内开展了取心、孔内电视等相关测试，验证了HDD用于隧道地质勘察的可行性及高效性。
The horizontal directional drilling (HDD) method used
in trenchless pipe excavation is employed in tunnel geological survey to
overcome the shortcomings of traditional drilling survey methods and more
accurately derive information and stress distribution characteristics of the
rock mass from tunnel surrounding. Detailed technical solution derived from the
HDD method can be summarized as follows: After boring a HDD survey hole along
the tunnel′s design axis, intermittent coring and tests, such as hydraulic
fracturing, comprehensive logging, and downhole television are performed, and
the test results are used to accurately identify the lithological variation of
surrounding rock along the tunnel′s design axis, the
distribution range of fracture zone, and the water inrush condition in the
tunnel. Furthermore, the HDD method is used to investigate the geology of the
Tianshan Shengli tunnel. Finally, coring and boreholedownhole
television are conducted in a 2 271 mlong HDD survey
hole. The results confirm the feasibility and efficiency of employing HDD
technology in tunnel geological surveys.
