Ensuring construction
safety for a metro project in an urban area, particularly when crossing beneath
high-pressure oil and natural gas
pipelines in water-rich, weak strata, requires robust
risk control strategies. The authors examine risk control measures for the
construction of large-section, small-spacing rectangular pipe-jacking metro
stations. Key measures, including pre-reinforcement
techniques, pipe-jacking parameters, and closely
adjacent construction methods, are implemented. A slurry-balanced rectangular pipe-jacking machine
featuring a central large cutterhead, two rectangular side cutterheads, and an
excavation rate of up to 95% is selected. Reinforcement strategies include
ground reinforcement at the jacking shaft end, horizontal reinforcement at the
receiving shaft end, and reserved reinforcement holes for interconnection
channels within the pipe-jacking section. These
measures ensure that critical parameters such as total jacking thrust,
cutterhead torque, slurry chamber pressure, and jacking speed, remain within
specified ranges. By employing jacking posture control technology, enhancing
synchronous and secondary grouting, and increasing the longitudinal rigidity of
pipe segments through posttensioning of prestressed steel strands, closely adjacent
construction is successfully executed. Monitoring data analysis indicates the
following: (1) During excavation of the left and right lines, surface and
pipeline settlements are controlled within －7.20 to
0.76 mm and －5.49 to 3.51 mm, respectively. (2) During
closely adjacent construction of the right line, surface and pipeline
settlements are maintained within －3.64 to 3.61 mm and －1.45 to 2.92 mm, respectively.
WU Senyang
,
CHEN Xiang
,
CHEN Peng
,
ZENG Yuhan
. Construction Risk Control
of Large-Section, Small-Spacing Rectangular Pipe-Jacking Metro Stations: A Case Study of Haibang
Metro Station in Guangzhou, China[J]. Tunnel Construction, 2025
, 45(2)
: 382
-391
.
DOI: 10.3973/j.issn.2096-4498.2025.02.014
