To control the large squeezing deformation of
surrounding rocks with high geostress, the CVISC viscoelasticplastic
model formed by the Burgers model and MC plastic body
in series is selected for isotropic soft rocks such as mudstone, sandstone, and
siltstone based on the previous tunnel cases with large squeezing deformation.
The radial displacement of the surrounding rock is divided into instantaneous
elasticplastic phase displacement and viscoelastic
phase displacement using the independent properties of viscoelastic and elasticplastic elements of the CVISC model. The analytical solutions of
radial displacement in the plastic and viscoelastic zones are derived
respectively, and the superimposed combination forms the analytical solution of
displacement distribution in the surrounding rock. Following this, the radial
displacement and stress fields of the surrounding rock are analyzed as a
function of time, and the deformation law of the opening is described. The
applicability of model is verified with the help of FLAC3D and the theoretical
solution of related literature. On this basis, parametric sensitivity analysis
of longterm deformation is carried out. The results
show that the three most critical parameters in each phase are internal
friction angle, cohesion, and Young′s modulus, and the
creep parameter has significant sensitivity only in its control phase.
LU Yiqiang, SHI Boran, HE Fei, YUAN Yong, YAO Xupeng, ZHANG Jiaolong
. ViscousElasticPlastic Solution of DeepBuried Circular Opening Based on CVISC Model[J]. Tunnel Construction, 2023
, 43(S1)
: 145
-153
.
DOI: 10.3973/j.issn.2096-4498.2023.S1.017
