The deephole drilling results of the
BadongXiangluping tunnel group on the ZhengzhouWanzhou railway crossing karst area revealed multiple adverse
geological conditions, including waterflow sound, cold wind leakage, and giant
haftfilled karst with a diameter exceeding 80 m. Thus,
a regional hydrogeological survey and systematic groundwater hydrodynamic analysis
are conducted. The findings indicate that the karst cave bottom is an
underground river. Consequently, the existing tunnel route scheme for the
preliminary design phase is improved in the construction drawing. Due to the
control of station location, elevation, and longitudinal slope of the route, it
is impossible to conduct wideranging adjustments on
threedimensional space. For that reason, five route
schemes are proposed for the plane. Finally, a thorough comparison and
selection of main adverse geologies, karst development degree, surrounding rock
grade, auxiliary tunnel, construction risk, and project investment are carried
out. Considering construction risk and relative investment, the D8K route
scheme that avoids the underground river is recommended. Overall, the
construction excavation results show a successful route selection.
LIU Ke
,
LI Yajun
,
WANG Qingchuan
,
LIU Xiongwei
,
SHANG Hanchun
. Route Selection Scheme Research on BadongXiangluping
Tunnel Group on ZhengzhouWanzhou
Railway in Karst Geology[J]. Tunnel Construction, 2021
, 41(10)
: 1771
-1780
.
DOI: 10.3973/j.issn.2096-4498.2021.10.017
