The shield section of the Karnaphuli Rivercrossing
tunnel project in Bangladesh is a doubletube highway
tunnel, and both the tunnels are bored using the same shield. The shieldreceiving section of the left line is located in a highlypermeable siltyfine sand strata in coastal
area where in conventional shield receiving technology would easily cause sand
and water gushing, leading to the failure of shield receiving. Accordingly, to
ensure safe and efficient shield receiving and realize secondary launching,
steelsleeve receiving technology is adopted.
Furthermore, the major risk points of the construction technology are predicted
to determine the corresponding prevention and control and emergency 〖HJ2mm〗measures, thus ensuring smooth
implementation of largediameter slurry shield steelsleeve receiving. The largediameter 〖ＨＪ2.3mm〗slurry balance shieldreceiving process has been continuously optimized at the tunnel
construction site in Bangladesh, and theoretical analysis, simulation test, and
method optimization are conducted regarding the sleeve design, deformation control, shaft end
reinforcement, portal cutting, shield tunneling monitoring, construction
parameter control, portal sealing, and segment stability control at the
receiving section. Eventually, key construction technologies for the steelsleeve receiving of a largediameter slurry
balance shield suitable for waterrich siltyfine sand strata in coastal areas are formed.
LIU Hua
,
HE Yuan
,
ZHONG Han
,
ZHANG Feilei
. Key Technologies for Steel Sleeve Receiving of a LargeDiameter
Slurry Shield in WaterRich
SiltyFine Sand Strata in Coastal Area: a Case Study of Karnaphuli RiverCrossing
Tunnel in Bangladesh[J]. Tunnel Construction, 2021
, 41(7)
: 1225
-1233
.
DOI: 10.3973/j.issn.2096-4498.2021.07.017
