In order to solve the problems of receiving largediameter
slurry shield in strong permeable sand pebble stratum with shallow overburden,
based on large diameter slurry shield tunnel of Yuanjiang in Changde City, dry receiving construction
technology is proposed. The stability of the whole structure in end
reinforcement area is improved and the conditions for shield acceptance are
satisfied by using the joint reinforcement methods of RJP superhigh pressure jet grouting, vertical freezing and plastic concrete
diaphragm wall in the end reinforcement area. In the process of shield dry
receiving, by controlling various construction parameters and grasping the key
points of construction timing accurately, shield machine smoothly passes
through the existing pipeline and reinforcement area, and the maximum
settlement of the pipeline and the surface is controlled within 6 mm and 5 mm
respectively so as to ensure the accurate exit of the shield machine. In
addition, portal brushes are installed in the steel ring of the portal to
prevent soil loss when shield machine exits the tunnel. Meanwhile, synchronous
grouting volume is increased and segments are connected and fixed with channel
steel to ensure shield tail and support safety during the process of shield
machine leaving the tunnel.
YAO Yinbin
. Construction Technology of Large Diameter Slurry
Shield in Strong Permeable Sand Pebble Stratum with
Shallow Overburden Soil[J]. Tunnel Construction, 2020
, 40(S1)
: 396
-403
.
DOI: 10.3973/j.issn.2096-4498.2020.S1.052
