The aim of this study is to analyze the applicability
of singlecantilever tunneling machines in shallowcovered
tunnels adjacent to existing buildings and largesection
railway tunnels. Studies regarding comparison and selection of nonblasting excavation methods are conducted along with investigation of
the surrounding environment and lithology of the surrounding rocks, numerical
simulation, and field test of New Hongyan tunnel on ChengduChongqing highspeed railway crossing
underneath underground shopping mall. Following conclusions are drawn: (1) The
singlecantilever tunneling machine can decrease the
construction disturbance on surrounding rocks and buildings, considerably
affecting the deformation control and construction safety. (2) The excavation
efficiency of singlecantilever tunneling machine is
high in surrounding rocks with a strength of approximately 30 MPa. (3) The
singlecantilever tunneling machine costs much more
than the conventional tunneling machine, and it costs almost the same in Grade Ⅳ and Ⅴ surrounding rocks. (4) The excavation
of a singlecantilever tunneling machine is subject to
restrictions of tunnel crosssection size and safe step
pitch control, leading to complex excavation procedures and low tunneling
efficiency. The machine is recommended for shortdistance
excavation in delicate construction sites of special environments. Longdistance tunneling requires further optimization of the excavation
method system of singlecantilever tunneling machine,
as well as dust control measures in the environments mixed with sandstone and
mudstones.
LYU Yonglin
,
ZHANG Dongjie
,
TANG Wenxi
,
YANG Xuezhong
,
QIN Xiaofeng
,
REN Yi
. Adaptability Analysis of SingleCantilever
Tunneling Machine in ShallowCovered
Tunnel Excavation in Busy Urban Areas: a Case Study on
New Hongyan Tunnel Crossing underneath Underground
Shopping Mall[J]. Tunnel Construction, 2021
, 41(4)
: 649
-656
.
DOI: 10.3973/j.issn.2096-4498.2021.04.016
