The construction of inclined shafts in highaltitude
tunnels within cold regions presents significant challenges, including low air
pressure and oxygen levels, considerable temperature variations, and extreme
cold and dry conditions. To tackle these issues, a case study is conducted on
the Longbagou inclined shaft of a plateau railway tunnel. The authors introduce
a mechanized matching principle for inclined shafts, taking into account the
surrounding rock grade, section size, and altitude. Consequently, a safe and
efficient mechanized construction method is developed, particularly suited for
inclined shafts with steep slopes in highaltitude
areas. This method involves the selection and deployment of a complete range of
mechanized equipment for advance support, drilling and blasting,
transportation, spray anchor support, and lining. Efficient construction
techniques that include rapid excavation, transportation, and support,
alongside swift integration of various processes are proposed. Central to this
approach is the management of surrounding rock deformation, around which a
proactive support system is constructed, emphasizing early intervention in rock
reinforcement, early support, and rapid sealing. The findings reveal that, in
comparison to traditional drilling and blasting methods, the advanced
mechanized construction, facilitated by a threeboom
rock drilling jumbos, significantly enhances construction efficiency (achieving
a maximum monthly advance of 180 m, which is 30% greater than traditional
methods), improves construction stability, reduces the number of operators
required, and ensures appropriate lining strength. Furthermore, the crown
settlement and peripheral convergence are maintained within acceptable limits,
thereby enabling the rapid excavation, support, and sealing of smallsection highaltitude tunnels.
LI Zhijun
,
YU Jingbo
,
WANG Jingang
,
LIU Weizheng
,
CHEN Qiao
,
LI Zeng
. Mechanized Matching and Fast Construction Technology
for Inclined Shafts in HighAltitude Railway Tunnels[J]. Tunnel Construction, 2024
, 44(3)
: 576
-585
.
DOI: 10.3973/j.issn.2096-4498.2024.03.015
