Due to alignment requirement, a mined tunnel section
of a new line of Guangzhou Metro should closely cross underneath a large
underground commercial space. There are 5 pile foundations should be
underpinned. As a result, the intunnel archshaped pile foundation underpinning scheme is adopted for various
restraining factors such as large pile axial force, large tunnel span and
complex field conditions. The empirical relationship between the height and
width of underpinning structure crosssection and
tunnel span and pile foundation axial force is revealed by engineering
comparison; moreover, the structural internal force is analyzed by 2D loadstructure method and the deformation is simulated by 3D stratumstructure method, so as to verify the bearing capacity and normal
service limit state of the underpinning structure. The results show that the intunnel archshaped pile foundation
underpinning scheme is feasible in case of large pile loads and tunnel span,
and the preliminary rules for the dimensions of the underpinning structure are
applicable.
LIANG Yuehua
,
ZHAI Lihua
,
SHI Hai′ou
. Research and Application of Archshaped
Pile Foundation Underpinning in Tunnel with Large
Axial Force and Span of Metro Construction[J]. Tunnel Construction, 2020
, 40(12)
: 1765
-1674
.
DOI: 10.3973/j.issn.2096-4498.2020.12.011
