A model test system comprising a model rig and a noncontact
measurement system is designed for investigating the deformation law of the
stratum caused by tunnel construction. In this system, dry sand is used as a
filler. The stratum deformation and settlement upon the tunnel, which is due to
the invert arch deformation caused by a long stop time of shield, is simulated
by motor towing. The results of investigating the settlement pattern of the
stratum under various buried depths of the tunnel, stratum loss rates, and soil
compactness conditions show that: (1) The failure modes of the stratum are
roughly similar, but exactly similar to the shape of a funnel under various
conditions; the ground settlement decreases as the distance from the tunnel
increases, but the ground settlement curves under various conditions are
consistent with the Gaussian distribution function. (2) The width coefficient
of the ground settlement trough is related to the tunnel radius, shear strength
parameters of soil, and buried depth of the tunnel. The modified formula of the
settlement trough width coefficient is obtained by a quantitative analysis of
the test results. Finally, the modified formula is compared with that in
current research and the measured data to verify its reasonableness. In
conclusion, the formula can be used to predict the ground settlement in sandy
soil areas.
LIANG Lian
,
FANG Tao
,
FANG Lijian
,
XIAO Yandong
.
Experimental Study on Deformation Law of Stratum
Caused by Tunnel Construction
Based on Particle Image Velocimetry Technique
[J]. Tunnel Construction, 2023
, 43(4)
: 625
-633
.
DOI: 10.3973/j.issn.2096-4498.2023.04.009
