During the tunneling
process, segments of large-diameter
shield tunnels often experience uplift, dislocation, and linear deviation. To
address these issues, attitude simulations and field tests are conducted on
multiple large-diameter shield engineering projects and
construction processes. When the shield main machine operates with a lower head
or an attitude misaligned with the tunnel, significant upward buoyancy or
horizontal misalignment forces occur at the segments after they exit the shield
tail. This force can cause regular dislocation, tunnel alignment deviation,
segment cracking, segment breakage, or even leakage. The results reveal that
the primary causes of regular segment dislocation and tunnel alignment
deviation are the barycenter shift of the shield main machine, the floating of
the shield tail and rear segments, and excessive attitude adjustments.
Analytical results show that shield attitude and tunnel alignment control are
primarily influenced by formation properties, buoyancy, shield equipment,
segment structure, and construction control. The phenomenon of segment
dislocation can be avoided, and segment attitude and alignment can be
effectively controlled by rationally optimizing the weight, barycenter, and
grouting system of the shield main machine, strengthening the design of the end
structure of the segment ring joint and shear, enhancing shield attitude
fitting, controlling tunneling parameters, and innovating grouting technology.
DU Chuangdong
,
DU Yihang
,
HUANG Xiaofu
. Control Technology for
Segment Dislocation and Attitude
of Large-Diameter Shield Tunnels[J]. Tunnel Construction, 2024
, 44(7)
: 1510
-1519
.
DOI: 10.3973/j.issn.2096-4498.2024.07.017
