When slurry shield tunneling in sandycobble
strata, many problems will be encountered, such as cutterhead jamming, pipe
blocking, stagnation, and abnormal cutter wear. Hence, the factors induce the
above problems in Zirui tunnel of Xihuan road in Chengdu, China, are analyzed.
The project difficulties are predicted to conduct specific design. Based on the
highstandard pressure and surface subsidence
requirements, the techniques of air cushion slurry shield equipped with screw
conveyor and screw conveyer mucking + closed pipeline mucking are proposed and
adopted. The cobble excavated by the cutterhead are timely transported to the
outside of the excavation chamber by the screw conveyor, and further
transported to the outside of the tunnel through slurry pump and closed pipe,
so as to avoid the pebble accumulation and guarantee smooth shield tunneling.
The engineering application validates that the doublemode
shield is superior to conventional air cushion slurry shield in aspect of
adaptability to sandycobble strata.
HE Kaiwei, WANG Youzeng, DING Mengjun, ZHANG Penghao, SU Zhixue
. Specific Design and Application of DoubleMode
Shield in SandyCobble Strata[J]. Tunnel Construction, 2022
, 42(S1)
: 508
-516
.
DOI: 10.3973/j.issn.2096-4498.2022.S1.060
