In order to investigate the stability of tunnel palm face under the influence of arbitrary shield angle, we consider the influence of tilt angle on the stability of tunnel palm face based on linear Mohr-Coulomb strength criterion and the spatial discretization technique and "point-generated point" technique proposed by Mollon et al. By improving the existing three-dimensional active-passive damage model of the tunnel palm face, the ultimate support pressure of the active-passive damage of the inclined tunnel palm face is solved, and the three-dimensional active-passive damage model of the inclined tunnel palm face under the linear Mohr-Coulomb criterion is established, and the corresponding energy consumption equation of the active-passive damage model is generated. The calculation results of the model in this paper are compared and analyzed with those of existing models and numerical simulations to verify the rationality of the three-dimensional active-passive damage model of inclined tunnel palm face established in this paper. The results show that: the arbitrary shield longitudinal inclination angle is an important factor affecting the stability of the palm face and cannot be neglected; the three-dimensional rotational active-passive damage model of the palm face at any angle established in this paper is closer to the real solution than the existing model and can obtain better analytical results in the stability analysis of the palm face, which provides an effective theoretical guidance and reference for the safety of shield construction in similar tunnels.
Shan Shengbiao
,
Tan Zian
. Stability Analysis of Arbitrary Angle Tunnel Palm Faces Based on Mohr-Coulomb Criterion[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S1)
: 41
-53
.
DOI: 10.20174/j.JUSE.2024.S1.06
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