Deepburied tunnels in mountainous areas
are often under high water pressure condition, in which seepage has a great
impact on the surrounding rocks and lining structure safety. Based on the MohrCoulomb criterion, the elastoplastic analytical solution for the
interaction between surrounding rock and lining structure under the action of
seepage force is derived. The analytical expressions of the relations among the
radius of the surrounding plastic zone, the stress and displacement of
surrounding rock, and the radial deformation of lining with the support
resistance are given. Furthermore, the ground reaction curve and support
characteristic curve are introduced to analyze the mechanical characteristics
of nonlinear interaction between surrounding rock and lining, and the radial
displacement around the cave is obtained by the convergence constraint method.
Subsequently, relying on the deepburied section of the
Niuheling tunnel, the accuracy of the theoretical analysis method based on the
MohrCoulomb criterion recommended is verified.
Finally, the parameter analysis is performed on the relationship between the
support resistance, the plastic radius, and the radial displacement around the
cave. The main results show the following. (1) An increase in the support
resistance can effectively limit the development of the plastic zone and the
radial displacement around the cave. The initial limiting effect is obvious,
and the subsequent effect gradually decreases. (2) The plastic radius of the
surrounding rock and the radial displacement around the cave show nonlinear
growth with the increasing seepage water pressure. (3) In the case of a certain
radius of the plastic zone, low permeability lining can reduce the required
support reaction force and radial displacement around the cave. The research
results can provide a certain theoretical basis for the design and construction
of tunnels in waterrich mountain areas.
ZHANG Zhiguo, CHENG Zhixiang, WANG Jiacheng, WU Zhongteng, ZHAO Qihua
. Interaction between Surrounding Rock and Lining of
DeepBuried Tunnel Considering Influence of
Seepage[J]. Tunnel Construction, 2021
, 41(S1)
: 108
.
DOI: 10.3973/j.issn.2096-4498.2021.S1.014
