During superlargediameter
slurry shield tunneling, clogging problem is common in air cushion chamber due
to discharge channel, slurry outlet due to muck size, and slurry circulation
system due to unreasonable configuration. Accordingly, a case study is
conducted on the Shenzhen Chunfeng tunnel project, and study is carried out on
the slurry circulation system of a superlargediameter slurry shield. Based on the principle of fluid mechanics,
the key parameters of the slurry circulation system of superlargediameter slurry shield are calculated,
realizing reasonable configuration of slurry flow rate, pipe diameter, and pump
station, and improving the adaptability of the slurry circulation system to the
slurry with large particle size and high velocity. On the basis of theoretical
research, the front gate direct mucking mode is designed to reduce the risk of
delayed mucking, the main machine small cycle model is designed to improve the
muck carrying capacity of main machine, and the classification crushing
technology of main machine mucking is applied to prevent the large size of
stone from blocking the discharge mouth and slurry pump. According to the
construction results of Shenzhen Chunfeng tunnel, the method recommended can
effectively reduce the risk of delayed mucking in key positions such as slurry
chamber, air cushion chamber, and discharge port.
JIANG Qiao
. Key Technology of Hysteresis Control for SuperLargeDiameter Slurry Shield[J]. Tunnel Construction, 2021
, 41(S2)
: 620
-625
.
DOI: 10.3973/j.issn.2096-4498.2021.S2.079
