To explore the influence of shield tunnel receiving on
ground settlement, retaining pile, and structural end sidewall deformation
under different construction timings of the station′s
main structure of the receiving end, a case study is conducted on the actual
situation of the shield tunnel receiving construction project in a section of
Xi′an metro line 14. The finite element numerical
simulation method is employed to analyze the ground settlement and pile
deformation of the shield receiving end under various construction timing
conditions (i.e., after the completion of the bottom plate, the middle plate,
and the roof) when the shield is received. On this basis, the influence of the
change of the axial force of the steel support at different positions on the
displacement and deformation of the shield during receiving is further studied,
and the verification is carried out in combination with the field data. The
research results show the following: (1) After the completion of the midslab construction of the main structure at the receiving end of the
station, the shield receiving has the least impact on the surrounding surface
settlement and the deformation of the retaining piles. The maximum surface
settlement is located above end tunnel portal, and the horizontal displacement
occurs to the pile body and it develops toward free face displacement. (2) The
change of axial force of the first and second supports of the retaining
structure has a great influence on the surface settlement and the deformation
of the retaining pile after shield receiving, and the surface settlement and
the lateral deformation of the retaining pile significantly reduced with an
increase in the support axial force. (3) The axial force can be rationally
increased to control the surface settlement and retaining pile deformation.
WEI Desheng, LINGHU Yan, RUAN Lei
. Influence of Construction Timing of Shield Receiving
End Structure on Shield Receiving Construction[J]. Tunnel Construction, 2022
, 42(S1)
: 19
-27
.
DOI: 10.3973/j.issn.2096-4498.2022.S1.003
