To investigate the effect of top arch risespan
ratio on the force safety of the concretefilled steel
tubular(CFST) column and ground deformation of metro stations, a case study is
conducted on the Xiangheyuan station on Beijing metro line 17. Then, the
mechanical theoretical model of arch is established, and the variation rule of
internal force of the arch foot is obtained through theoretical analysis.
Finally, combined with numerical simulation method and field measured data
analysis, the force characteristic of CFST column and the regularity of surface
deformation under different top arch risespan ratios
are obtained. The results reveal the following: (1) Under different top arch
risespan ratios, the maximum shear force and bending
moment of the CFST column appear around the middle plate. (2) As the risespan ratio increases, the maximum axial force and surface settlement
tend to decrease and then increase, which is consistent with the results of
theoretical analysis. (3) At the stage of the secondary lining buckle arch
construction in the pilebeamarch
station, the increment of axial force of the CFST column increases the most,
and the axial force of the CFST column at this stage is more than 75% of the
final axial force. (4) After the main structure of the station is completed,
the maximum surface settlement is above the stations′ middle line, and the settlement trough curves are symmetrically distributed in
the stations′ middle line, which is the same as the
symmetric form of the pilot tunnel. The station with a small roof arch and span
has less uneven settlement as a result of construction, which aids to control
surface deformation.
ZHENG Ligang, CHANG Longfei, JIANG Hua, JIANG Yusheng
.
Stress Characteristics of ConcreteFilled
Steel Tubular Column and Surface Deformation in PileBeamArch
Station with Different RiseSpan Ratios of Arch:
a Case Study of
Xiangheyuan Station on Beijing Metro Line 17
[J]. Tunnel Construction, 2022
, 42(S1)
: 174
-182
.
DOI: 10.3973/j.issn.2096-4498.2022.S1.020
