The transverse surface settlement induced by shield
tunneling of Shenyang Metro Line 1 is analyzed by finite element method. The
concepts of ground loss and ground stress release are introduced, and the
finite element models under different ground loss rates and ground stress
release values are established. The comparison results between monitored
surface settlement and simulated values show that the surface settlement is
proportional to the ground loss rate and the ground stress release rate. And
then, by comparing the maximum settlement value of the monitored data and
simulated values, it is determined that the ground loss rate caused by the
construction is 1.747%, and the ground stress release rate is 74.071%.
Similarly, it is determined that the ground loss rate in 10 cities caused by
tunnel construction ranges from 0.5% to 2% and the ground stress release rate
ranges from 60% to 80%. Finally, the maximum bending moment at the lining
concrete segment of the FEM model with the ground loss rate of 1.747% and
ground stress release rate of 74.071% is compared with that without ground loss
and ground stress release, and the comparison results show that the maximum
bending moment value significantly reduces by 76.16% and 71.82%, respectively.
The bending moment values obtained by the two methods are basically the same,
which indicates the equivalence of ground loss rate model and ground stress
release model.
DU Hongze, LI Shouju
.
Analysis on Surface Settlement Induced by Shield
Tunneling Based
on Stress Release
[J]. Tunnel Construction, 2020
, 40(S1)
: 241
-246
.
DOI: 10.3973/j.issn.2096-4498.2020.S1.030