In order to study the mechanical response of shield
tunnel segments in round gravel strata during construction period, a crosssection
of Yuangjiang Rivercrossing Tunnel with the largest
burial depth is selected to carry out test on internal stress variation characteristic
and external water pressure of tunnel segment by continuous monitoring method,
and comparison and contrast is made between monitoring data and simulation
results. Main conclusions are drawn as follows: (1) The external water pressure
of the segment structure is significantly affected by the construction of
shield; the external pressure of ring 1 to 10 from the excavation surface
fluctuates, and the time when the maximum value of different positions appears
is different, which become stable after ring 10. (2) The axial force of the
segment structure is mainly affected by the decoupling and grouting; the
influence of the first three grouting is the most significant, and the
influencing range is from ring 1 to 9; while the condition of bending moment is
similar to that of axial force, but the influencing range by grouting is about
1 ring delay compared with the axial force. (3) The internal force of the
segment is larger than the simulated calculation values, which indicates that
the segment is affected by jacking force, hardening process of grouts and
assembly effect.
LU Kaidao
. Insitu Tests on Mechanical Response of
Underwater Shield Tunnel Segments in Round Gravel
Strata during Construction Period[J]. Tunnel Construction, 2020
, 40(S1)
: 152
-159
.
DOI: 10.3973/j.issn.2096-4498.2020.S1.019
