A case study on a 66 m long
connecting gallery between Ziyang station and Wuliting station of Fuzhou metro
line 2 is conducted to summarize the design and construction techniques of the
freezing method of the ultra-long connecting gallery
(over 60 m) in a complex environment. Optimization measures, such as double
collecting well structures and connecting gallery dimension reduction, are
implemented during the design phase. The following pivotal techniques are
proposed: (1) Drilling azimuth angle is measured by a high-precision inclinometer, and the drilling parameters are
appropriately set. (2) Freezing curtain size and freezing period are
appropriately set and optimized. (3) Secondary support and zone excavation
methods are used. (4) Grouting holes are appropriately set, and the fine
tracking grouting is used to control the surface settlement. The analysis of
the measured data of freezing measurement and surface settlement show that the
techniques used can guarantee the freezing quality, control the frost heaving
and thawing settlement, and minimize the influence on the surroundings,
resulting in the successful completion of the super-long
connecting gallery.
ZHU Zexuan
,
LIU Hongwei
,
WU Yongzhe
,
YANG Ping
,
ZHANG Ting
. Design and Construction Techniques of Freezing Method
of Ultra-Long Connecting Gallery between Ziyang Station and Wuliting Station of Fuzhou Metro
Line 2[J]. Tunnel Construction, 2022
, 42(6)
: 1053
-1060
.
DOI: 10.3973/j.issn.2096-4498.2022.06.013
