To investigate the primary
factors influencing segment uplift during shield tunneling, particularly the
effect of grout properties on segment uplift, a load-sensing measurement structure for segment uplift is designed, and a
visualized model test system is independently developed. The structural safety
and functional feasibility of the system is verified through numerical analysis
and water injection tests, and the system′s measurement
error for uplift force on the segment is determined. The results reveal the
following: (1) The change in uplift load on the segments during grouting is
linearly related to the grout volume, with R2 values exceeding 93%. The average linear rate of change in uplift
load is 62.6% of the theoretical value, with a difference of 28.79 N/cm
compared to theoretical calculations. (2) Grease in the floating seal chamber
inhibits segment uplift, generating resistance equivalent to approximately
41.1% of the theoretical uplift load. The maximum deviation between the actual
and theoretical uplift loads is approximately 2.1%, indicating that the system
accurately simulates the force conditions of segment uplift. (3) The cross-sectional load growth rate initially decreases and then increases as
the grout volume changes. The transverse displacement constraint of the
segments effectively controls horizontal displacement caused by overturning
loads on the segments.
WANG Haitao
,
WANG Yue
,
SUN Jiuchun
. Development of A Segment
Uplift Model Test System[J]. Tunnel Construction, 2025
, 45(1)
: 132
-138
.
DOI: 10.3973/j.issn.2096-4498.2025.01.010
