A case study is conducted on the Shasan station of the
Shenzhen metro line 12 Phase Ⅱ project to investigate the overall
mechanical performance of prefabricated rectangular metro stations with large
sections constructed using the pipe-jacking method. A
1:5 scale model of the station is developed to simulate various construction
and operational conditions based on the station′s
design scheme and finite element analysis. Model tests are performed to analyze
the structural mechanical behavior under different conditions. By incrementally
increasing the applied loads, the ultimate bearing capacity of the station is
assessed, and the experimental results are compared with those obtained through
finite element analysis. The test results are summarized as follows: (1) Under
construction and normal operating conditions, the station structure remains
primarily within the elastic deformation range. The maximum crack width on the
top slab is less than 0.2 mm, and the internal forces and deformations
throughout the structure meet the relevant design requirements. (2) When the
static load reaches 2.3 times the design load, extensive cracking appears on
the top slab and at the mid-span of the top supporting
beams, indicating widespread yielding, a sharp increase in deformation, and the
emergence of an inflection point on the load-displacement
curve. At 2.5 times the design load, diagonal cracks develope on the supports
of the top slab, signifying that the structure has reached its ultimate bearing
capacity. (3) The structural form adopted at the Shasan station demonstrates a
high safety margin and meets all design requirements. (4) The two-dimensional finite element analysis method shows poor applicability
for this structural form and should be revised or replaced with a three-dimensional analysis approach.
ZHOU Shengyang
,
LIU Shuya
,
JIANG Shouchao
,
YAO Haoyu
,
ZHU Qikai
,
LIU Xian
,
LI Wei
,
WANG Lei
. Scale Model Test on Mechanical Performance of Large-Section Rectangular Pipe-Jacking Metro
Station[J]. Tunnel Construction, 2025
, 45(4)
: 758
-773
.
DOI: 10.3973/j.issn.2096-4498.2025.04.010
