During the construction of large crosssection
horseshoeshaped EPB shield, many problems such as
attitude control difficulty, mud cake and tunneling difficulty, would be
encountered. Hence, the key technologies for the construction of large crosssection horseshoeshaped EPB shield used in
Baicheng Tunnel of Menghua Railway are studied. The study mainly focuses on
follow aspects: (1) In order to guarantee smooth and safe launching of shield,
measures such as launching base, portal sealing device, launching parameters
control and counterforce provided by strengthened opencut tunnel are adopted. (2) The shield attitude is controlled by
partition cylinder thrust or slurry injection; the soil conditioning effect is
improved by high polymer; and the safe shield crossing underneath BaotouMaoming Experssway is guarantee by adopting rational tunneling
parameters and measuring method. (3) The problem of blind area at the bottom of
the cutterhead is solved by adding a cone slag separator and expanding the
spokes of the cutterhead at the bottom of cutterhead. (4) The shield is safely
recieived by correctly install the receiving based and endwall.
ZHANG Longguan, LI Zhigang, LU Guizhen, TAN Jiang
.
Key Construction Technology of Large Crosssection
Horseshoeshaped Shield:
a
Case Study on Baicheng Tunnel on Menghua Railway
[J]. Tunnel Construction, 2020
, 40(S1)
: 297
-306
.
DOI: 10.3973/j.issn.2096-4498.2020.S1.038
