The Second Jiaozhou Bay subsea tunnel is featured by
super length, super size, super depth, complicated geological conditions,
difficult ventilation and smoke extraction conditions, difficult evacuation and
rescue conditions, complicated connection to the road network on both coasts,
and restrictions on construction conditions. In this study, the authors study
on 〖HJ5mm〗key issues of the superlong subsea tunnel, including the location, construction method,
overburden, arrangement in tunnel, ventilation and smoke extraction, evacuation
and rescue, in order to construct the Second Jiaozhou Bay subsea tunnel in a
scientific, safe and economic way. The following main findings are concluded:
(1) The concept of selecting the tunnel alignment based on the geological
conditions shall be emphasized in the general design of the superlong subsea tunnel, which is key to reducing the construction and
operation risks, controlling the investment and guaranteeing the construction
period. (2) In the general design of the superlong
subsea tunnel, it is important to compare different construction methods,
select appropriate construction methods for different sections of the subseal
tunnel and determine the reasonable overburden according to the specific
geological and construction environment conditions. (3) The subsea section of
the Second Jiaozhou Bay subsea tunnel consists of twin main tunnel tubes and
one service tunnel tube. The air passage is set at the top area of the subsea
section of the main tunnel tubes, the innovative 2.5section
ventilation plan is put forward, and the service tunnel is also used as the
fresh air channel, which solves the ventilation problem of the super-long subsea tunnel. (4) A management center is set up at each portal
of the tunnel, an emergency management station is set up at the portal of the
service tunnel. Moreover, a complete evacuation and rescue system, which
consists of the service tunnel, the pedestrian/vehicle cross passages, and the
evacuation stairs and the longitudinal evacuation channel in the lower part of
the shieldbored section, is arranged. In this way, the
operation safety of the superlong subsea tunnel is
guaranteed.
XIAO Mingqing
,
SUN Wenhao
,
QU Liqing
,
LI Xiang
,
CHEN Libao
,
NI Jian
,
MA Xiangfeng
. Study on General Design of Second Jiaozhou Bay Subsea
Tunnel[J]. Tunnel Construction, 2023
, 43(2)
: 199
-216
.
DOI: 10.3973/j.issn.2096-4498.2023.02.002
