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.
MA Baosong
,
CHENG Yong
,
LIU Jiguo
,
ZHU Donglin
,
YAN Xuefeng
,
ZHAO Qiang
. Tunnel Accurate Geological Investigation Using LongDistance
Horizontal Directional Drilling Technology#br#[J]. Tunnel Construction, 2021
, 41(6)
: 972
-978
.
DOI: 10.3973/j.issn.2096-4498.2021.06.009
