There is no relevant engineering experience of large
crosssection rectangular pipe jacking method in the construction of metro stations in urban
core area. The Jing′an Temple station of line No.14 of
Shanghai metro, the first large crosssection
rectangular pipe jacking methodconstructed underground
station in soft soil, is taken as an example, and the construction settlement
control techniques of the east line tunnel including reasonable propulsion
parameters, new antireaction system, new antifriction thixotropic mud and corresponding pressure injection
technology are introduced in detail. The actual value of the soil pressure on
the upper part of the soil camber is slightly higher than the set value, and
the difference is controlled between 1.1% and 7.5%. The actual values of main
parameters such as total thrust, main cutterhead torque, and propulsion speed
are strictly controlled within the set value range. The retraction of the pipe
is controlled within 35 mm by using new antireaction
device. The new antifriction thixotropic mud can
perfectly fill the gaps and reduce the friction between the soil and the pipe.
The analytical results of measured surface deformation data show that during
pipe jacking of east line, the maximum cumulative longitudinal settlement
occurs at area 18 m above pipe, i.e. about 2 times of pipe jacking diameter,
and the overall surface settlement is controlled between -15 mm and 5 mm.
WU Liecheng
,
HAUNG Dezhong
,
QIU Yan
.
Settlement Control Technology in Metro Station
Construction with Large Cross-Section
Rectangular Pipe Jacking Method: a Case Study of
Jing′an
Temple Station of Line No.14 of Shanghai Metro
[J]. Tunnel Construction, 2021
, 41(9)
: 1585
-1593
.
DOI: 10.3973/j.issn.2096-4498.2021.09.018
