In order to
study the structural force and deformation laws of shallowburied
shield tunnel with super large diameter under different jack thrusts and
deflections, a threedimensional model of shield tunnel
lining segments considering water and soil pressure, shield tail brush reaction
force, and jack thrust is established with finite element software ABAQUS. The
internal force and deformation of lining segment are analyzed when the lining
segment is deflected under the conditions of straight, upward, downward, and
leftward movement of the shield. The results show that: (1) Jack thrusts mainly
influence the first 8 rings of lining segment, in which the first 3 rings is
more obvious, and the largest dislocation position in the ring is mainly
concentrated near the capping; (2) The tunneling direction of shield mainly
affects the displacement of the rings in this direction, instead of that in
vertical direction; (3) The vault/bottom is mainly affected by vertical
deflection angle and not affected by the lateral deflection angle, and the
waist is more sensitive to lateral deflection angle and is less affected by
vertical deflection angle; (4) When the vertical deflection angle occurs, the
downward deflection angle is very easy to cause stress surge in the first few
ring segments; (5) When the lateral deflection angle occurs, the ipsilateral
deflection angle is more likely to cause displacement and stress surge in side
segments.
ZHANG Wenjun, NIU Rongjian, QI Jianbing, ZHANG Chi, ZHANG Gaole, HE Lichao, LYU Jirui
. Impact of Jack Thrust on Force and Deformation of
Segment Linings for ShallowBuried
Shield Tunnel with Super Large Diameter[J]. Tunnel Construction, 2022
, 42(S1)
: 66
-78
.
DOI: 10.3973/j.issn.2096-4498.2022.S1.008
