To investigate the effects
of grouting pressure, slurry properties, and grouting diffusion range on the
model responses (surface settlement and ground loss) of shallow tunnels, an
innovative model test device is developed. This device can simulate the variation
of lining segment of the shallow tunnels during grouting. The device includes
systems of tunnel convergence, loading-unloading,
grouting, and sample preparation. The originality of this device is that the
model lining can move freely in the vertical direction during the grouting
process, which is more in line with the engineering reality. The experimental
results show the following: (1) The slurry pressure evolution pattern under
allowable tunnel displacement is different from that of conventional model with
fixed conditions. To be specific, the peak value of the slurry pressure under
the allowable tunnel displacement is about 5 times that under the conventional
tunnel model with fixed conditions. (2) With increasing grouting pressure, a
higher peak value of the slurry pressure is obtained and the surface volume
loss rate is reduced by up to 0.71% in the present study. (3) With increasing
grouting volume, the trend of the slurry pressure turns different and the
ground loss ratio is reduced by up to 0.67%. (4) When using different grouting
methods, the form of the slurry diffusion becomes different and the ground loss
ratio decreases by up to 0.44%.
YU Guowu
,
HE Haoshen
,
ZHAO Teng
,
LIN Cungang
,
XIA Bin
,
LIANG Yu
,
ZHAO Chenyang
. Large-Scale Model Test Device for Grouting Behind Shield Tunnel Lining and Preliminary Investigation[J]. Tunnel Construction, 2024
, 44(S2)
: 123
-134
.
DOI: 10.3973/j.issn.2096-4498.2024.S2.013
