Application of LongDistance Horizontal Directional
Borehole Coring Technology:&nbsp;A
Case Study of Geological Investigation of Tianshan Shengli Tunnel

CHEN Yunlong, LIU Gengren, CAI Jiapin, LIU Xielu, RUAN Hailong, JIANG Yuwen

doi:10.3973/j.issn.2096-4498.2023.S1.034

2023 , Vol. 43 >Issue S1: 298 - 303

DOI: https://doi.org/10.3973/j.issn.2096-4498.2023.S1.034

Application of LongDistance Horizontal Directional Borehole Coring Technology: A Case Study of Geological Investigation of Tianshan Shengli Tunnel

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(1. Beijing Institute of Exploring Engineering, Beijing 100083, China; 2. CCCC Second Highway Consultants Co., Ltd., Wuhan 430052, Hubei, China; 3. Sichuan Conqueror Petroleum Science and Technology Corporation LTD, Deyang 618000, Sichuan, China)

Online published: 2023-08-28

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Abstract

To clearly identify the fullsection geological information of the tunnel with long distance and large burial depth before construction, the TKSQ215 largediameter horizontal borehole coring is developed based on the vertical drilling and coring technology and the characteristics of horizontal coring. Special coring technology is implemented, which successfully implement 1 900m longdistance horizontal drilling and coring operation, 2.31m coring advance, 2.2 m coring samples, and 95% coring rate. The results show that a horizontal drilling hole along the tunnel direction arranged can collect the fullface tunnel geological information when using longdistance horizontal coring technology, which does not use vertical and multiple shaft construction, thus it is simple and efficient.

Key words： tunnel engineering; geological investigation; horizontal directional drilling; coring tools; diamond bit

Cite this article

CHEN Yunlong, LIU Gengren, CAI Jiapin, LIU Xielu, RUAN Hailong, JIANG Yuwen . Application of LongDistance Horizontal Directional Borehole Coring Technology: A Case Study of Geological Investigation of Tianshan Shengli Tunnel[J]. Tunnel Construction, 2023 , 43(S1) : 298 -303 . DOI: 10.3973/j.issn.2096-4498.2023.S1.034

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