To study the stressinfluencing factors of the
segments during shield tunneling through the round gravel stratum of Yuanjiang
River in Changde, China, the internal forces on the segment structure and
stratum water pressure at the segment ring with the highest waterhead on the
east line tunnel are obtained during segment assembling and shield passing
through. The synchronous grouting pressure and shield jacking force are also
extracted and are compared and contrasted with the internal forces on the
segment. The following conclusions are drawn from the study: (1) The
synchronous grouting significantly affects the internal force on the segment,
mainly by affecting the stratum water pressure. The first three groutings most
severely impacts the internal force of the segment after decoupling. (2) The
jacking force negatively affects the internal force on the segment, mainly in
the longitudinal direction. (3) When the segment force becomes stable, the
circumferential axial force and bending moment reach 3
700~5 000 kN and -200~200 kN·m,
respectively, and the longitudinal axial force reaches 0~2 500 kN, indicating a large axial force,
small bending moment, and good health of the segment.
LU Kaidao
.
In Situ Tests on Construction Load and Mechanical
Response ofShield
Tunnel in Underwater Gravel Stratum
[J]. Tunnel Construction, 2021
, 41(1)
: 44
-51
.
DOI: 10.3973/j.issn.2096-4498.2021.01.005
