To investigate the mechanical characteristics of
horizontal jet grouting arch shed in waterrich sandy stratum affected by
tunnel excavation and groundwater, model tests are carried out for three groups
of horizontal jet grouting arch sheds with various pile center distances under
various excavation footage and groundwater level conditions, and the variation
laws of surface settlement, deflection, bending moment, axial force of arch
shed, and contact pressure between arch shed and stratum are examined. The
results show the following: (1) When the pile center distance is small, the
ground settlement, longitudinal axial force and bending moment of the pile,
deformation of surrounding strata and the pile are less affected by the tunnel
excavation and water level conditions, but the longitudinal compression area of
the pile increases. (2) With the increase of the bite thickness between piles,
the affected area of the stratum moves forward along the tunnel excavation
direction; when the pile center distance is less than 350 mm (that is, the bite
thickness between piles continues to increase), the disturbed area of the
stratum along the tunnel excavation direction will not change under the support
of the horizontal jet grouting arch shed. (3) The groundwater has a great
impact on the longitudinal deflection of the arch shed; in the waterrich sandy stratum, increasing the bite thickness between piles(that
is, reducing the pile center distance) can effectively reduce the deflection of
the arch shed near the excavation surface.
WANG Chao
,
SHI Yufeng
,
CHEN Zhaoyang
,
ZHU Jiangwei
,
JING Yongbo
,
ZHANG Tao
. Model Test on Mechanical Characteristics of Horizontal
Jet Grouting Arch Shed in WaterRich Sandy Stratum[J]. Tunnel Construction, 2022
, 42(S2)
: 242
-250
.
DOI: 10.3973/j.issn.2096-4498.2022.S2.030
