In order to
study the deformation of pipejacking caisson and its surrounding
soil under jacking force, the ABAQUS software calculation model with reinforced
jet grouting pile as caisson strengthening method is established, and the
simulation result is analyzed and compared with practical project and the
result of PLAXIS 3D software. Meanwhile, a caisson model test is carried out
with the granite residual soil of Guangzhou to verify and complement the
numerical simulation results. The conclusions are as follows: (1) Jet grouting
pile with designed strength before excavation can effectively reduce soil
collapse around the foundation pit and pit heave. (2) When the working jacking
force is applied, the penetrating crack firstly appears in the front active
zone, and the vertical displacement slope increases and an obvious inflection
point appears; if the jacking force continues to increase, the soil
displacement will increase sharply and the surface settlement will be serious.（3) For the soil at the back, under the jacking force, the tangent
angle of the surface rupture line gradually increases from 0° to 45°+φ/2,
resulting in the expansion of the fracture range；When
the jacking force reaches 45°+φ/2, the extension of the failure range in the short axis direction
is faster than that in the long axis direction；In the
threedimensional space, the failure surface of the
failure soil in the passive zone is elliptic in shape at the surface；The direction of the long axis of the ellipse is the direction of
the pushing axis, and the passive failure body shows an elliptic wedge in the
shape of a bull horn.
WANG Xuxiang, LIAN Jiye, MAO Jimin, YANG Xueqiang, SONG Limin
. Research on Three Dimensional Soil Failure Shapes and Settlements Around Shallow Buried Pipe Jacking Caisson[J]. Tunnel Construction, 2022
, 42(S1)
: 257
-266
.
DOI: 10.3973/j.issn.2096-4498.2022.S1.030
