To guarantee the operation safety of the existing
railway and the construction safety of newlybuilt tunnel, a pipecurtain method is proposed for the newlybuilt
tunnel when crossing underneath existing railway subgrade using engineering
analogy method. The technology includes pipecurtain
construction and tunnel construction. The preliminary works of foundation pit
excavation, reaction wall and guide wall construction, and advance support of
the tunnel face are introduced, and indepth analysis
and discussion is conducted on key procedures and technologies such as pipe
curtain construction process, precise jacking, grouting in pipe, tunnel
excavation, tunnel support, etc. Finally, the monitoring results are analyzed,
and the results show that the pipecurtain method
adopted in underpass construction is safe and practical, the maximum cumulative
settlement of the surface is 19.2 mm, the maximum settlement of the tunnel
crown at underpass section is 25.61 mm, and the maximum horizontal convergence
is 17.5 mm, realizing zerowarning construction. The
safe operation of the existing railway and the construction of newlybuilt tunnel have been guaranteed, and the construction schedule has
been reduced.
LI Haojie
. Construction Technology of NewlyBuilt
Tunnel Crossing underneath Existing Railway Subgrade
Using PipeCurtain Method[J]. Tunnel Construction, 2021
, 41(S1)
: 440
.
DOI: 10.3973/j.issn.2096-4498.2021.S1.058
