An ultralarge diameter slurry shield, called Shenlan,
was applied in the TJ06 bid section of the Jiaozhou Bay
second submarine tunnel in Qingdao, China. When this shield crossed the uppersoft and lowerhard composite strata, fullsection tuff, fault fracture zones, and fullsection granite for a long distance with high water pressure,
several problems, such as cutter wearing, inadequate rockbreaking capacity of cutter, stagnant discharge of the slurry
chamber, muck cake on cutterhead, and failure of the shield tail and the main
drive, were encountered. Thus, targeted designs are conducted as follows:
reducing cutter space, optimizing cutter arrangement and form, using slag
discharge mode by largediameter short spiral followed
by a jaw crusher, and strengthening and optimizing the scouring system of the
cutter blade and the slurry chamber. The applicable findings of these designs
result in the reduction of energy consumption and cutter damage, relief of
stagnant discharge in the slurry chamber, and better construction efficiency,
thereby ensuring enhanced construction safety.
LIU Hongzhi
,
CAO Yinggui
,
DAI Zhenyang
,
SUN Shuliang
. Selection and Targeted Design of CrossSea
Ultralarge Diameter Slurry Shield Tunneling Through
Various Typical Strata: A Case Study of Jiaozhou Bay
Second Submarine Tunnel in Qingdao, China[J]. Tunnel Construction, 2024
, 44(4)
: 793
-800
.
DOI: 10.3973/j.issn.2096-4498.2024.04.017
