To explore the influence of
shield underneath tunneling on high-speed
railway tunnel and address the related technical challenges, a case study is
conducted on the shield tunnel between the Sanyuan station and Taipingsi
station of the Phase 1 of the Chengdu metro line 9 closely-obliquely crossing underneath Chengdu-Guiyang
high-speed railway with a small plane included angle of
21° and long distance. Furthermore, a three-dimensional numerical model and a finite difference model are
established using Abaqus and FLAC3D software to simulate the entire process of
shield tunneling underneath a high-speed railway tunnel
and the finite element strength reduction process. Base on engineering
experience, the deformation control technology of shield tunneling underneath
high-speed railway tunnel is studied, taking
"stress compensation and active underpinning stratum" as the core.
The research results show the following: (1) The displacement deformation of
the high-speed railway tunnel on both sides of the
central section of the shield tunnel distributes symmetrically. (2) The
underpass construction has a great influence on the vertical displacement of
the high-speed rail track structure and a small
influence on the horizontal displacement. The vertical displacement of the
track structure is consistent with the overall settlement deformation of the
tunnel. (3) Active protection construction control technology is adopted to
control the stress compensation rate at 70%－140% in
time, which can effectively control the deformation of high-speed railway. (4) Under the condition of mudstone composite strata,
the delayed settlement period of high-speed railway
tunnel is as long as 4 months, and the proportion of delayed settlement is as
high as 30%－40%. The actual deformation of the high-speed railway is basically consistent with the simulation analysis
results, validating the applicability of the proposed deformation control
theory and key control technology.
HE Yonghong
. Deformation Control
Technology of a Shield Tunnel of Chengdu Metro
Line 9 Crossing Underneath a High-Speed Railway Tunnel[J]. Tunnel Construction, 2024
, 44(S1)
: 396
-407
.
DOI: 10.3973/j.issn.2096-4498.2024.S1.043
