This case study aims to investigate the disaster
evolution process of tunnellandslide system and tunnel stress
response characteristics under rainfall condition and reveal the evolution
mechanism of the rainfalllandslidetunnel system. This study is conducted on tunnel landslide of
Yangjiawan tunnel of Fengxi highway in Chongqing, China. The laboratory model
test used in this study reveals the following results. (1) Under rainfall
infiltration, the slope disaster evolution process shows a slope top tensioningmiddle slope creeping slipslope foot
traction damage trend. (2) As the soil is softened by groundwater, it creeps
and deforms, resulting in the downward transmission of the excess sliding force
along the direction of the slip zone. This results in the formation of a large
compressive stress at the slope foot that acts on the mountain side of the
tunnel. (3) The tunnel crown, arch waist, and foot of the mountain side are
prone to large stress concentrations, resulting in vertical tension cracks in
the tunnel crown. (4) The whole tunnel model is mainly subjected to pressure
under rainfall, and when entrance section is closer to the tunnel, the tunnel
is subjected to bias pressure. The difference in bending moment values between
the mountain side and the river side is 5.1~5.5 times, with uneven forces on
both sides that forms a typical bias tunnel.
GAO Yan
,
WEI Hong
,
LI Bo
,
LI Chuanguo
,
WU Honggang
. Disaster Evolution Mechanism of RainfallLandslideTunnel System: a Case Study of Yangjiawan Tunnel of Fengxi Highway in Chongqing, China[J]. Tunnel Construction, 2022
, 42(4)
: 611
-620
.
DOI: 10.3973/j.issn.2096-4498.2022.04.009
