To avoid the
limit of grid distortion when using a finite element method to simulate large
deformation, a twophase singlepoint material point method is employed to examine the evolution
mechanism of watersoil gushing around shield tunnel
and its influence laws on the hydromechanical behavior
of soil. The proposed method is verified using a sand leakage model experiment
and then applied in an engineering case. Based on the monitoring data, the
development of ground settlement, the evolution of stress field, and pore
pressure field in soil are analyzed in this study. With respect to watersoil gushing, the displacement field of the surrounding soil can be
classified into three zones: flow, disturbed, and stationary zones. The
development of the flow zone can help determine the influence of watersoil gushing. The process of watersoil
gushing can be classified into three stages: initial, rapid developing, and
stable stages. The influence of watersoil gushing on
surrounding soil can be minimized by its timely detection and implementation of
appropriate control measures at the initial stage. Finally, the parameter
analysis results reveal that: the higher the gushing point location, the faster
is the sand loss rate and the greater is the impact on the soil layers in the
rapid developing stage; the lower the gushing point location, the larger is the
final flow zone after the stable stage and the greater is the influence on the
soil stress field.
XIE Xiaochuang
,
ZHANG Dongmei
. Simulation of WaterSoil Gushing in Shield Tunnel
Based on Material Point Method and Its Application[J]. Tunnel Construction, 2023
, 43(6)
: 1045
-1056
.
DOI: 10.3973/j.issn.2096-4498.2023.06.015
