Technical issues include support and settlement
control induced by the fourtrack large crosssection tunnel closely crossing beneath the large utility tunnel in
weak and waterrich strata are always encountered. As a
result, case investigation, scheme comparison and selection, numerical
simulation analysis, and onsite monitoring methods are
used to investigate the construction technologies and processes, advanced
reinforcement, and supporting parameters of the GuangzhouFoshan intercity passing beneath the Huakang road utility tunnel.
The results reveal the following: (1) Based on the active deformation control
technology, the collaborative support scheme of the pipe roof under utility
tunnel, advanced pipe roof at the tunnel arch, horizontal jet pregrouting and
waterproofing, and doublelayer lining are adopted,
which is the optimal in terms of adaptability, construction period, and cost.
(2) The fourtube tunnel is excavated in order of
numbers 1, 3, 2, and 4. The cross diaphragm method is used for tunnel numbers
1, 3, and 4, whereas the threebench method is used for
tunnel number 2 to control the settlement of the tunnel and the utility tunnel.
(3) During the excavation of the tunnel number 1, the settlement and deformation
rate of the tunnel and utility tunnel is the largest. (4) Onsite monitoring results show that the settlements of surface,
pipeline, utility tunnel, and tunnel crown are all within 5 mm.
JI Yanlei
.
Protection Scheme for Shallow Buried
Fourth Track Tunnel with Large Cross Section Passing beneath a Utility
Tunnel: a Case Study on
GuangzhouFoshan Intercity Passing beneath
Huakang Road Utility Tunnel
[J]. Tunnel Construction, 2021
, 41(7)
: 1197
-1205
.
DOI: 10.3973/j.issn.2096-4498.2021.07.014
