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| Influence of lining permeability on the stability of surrounding rocks crossing weak and fractured zones of deep-buried and water-enriched tunnel |
| LYU Congcong1, CAO Li1, LI Zongli2, LU Xiaochun1, TIAN Bin1, WU Zhenchao1 |
(1. College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang, Hubei 443002, China;
2. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China) |
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Abstract To thoroughly investigate the influence mechanism of lining permeability on the stability of surrounding rock in deep-buried, water-enriched tunnels that traverse weak and fractured zones, the tunnel was modeled as an axially symmetric structure. The surrounding rock was categorized into three zones based on the degree of deformation: the elastic zone, the plastic softening zone, and the fractured zone. Utilizing the Mogi-Coulomb strength criterion, which accounts for the effects of the intermediate principal stress, theoretical derivations were conducted to derive solutions for the distribution of pore water pressure, as well as the stress and deformation resulting from seepage in tunnels. This study, based on specific engineering examples, analyzed the impact of lining permeability on the distribution of pore water pressure within the tunnel, the stress and radii of the plastic softening and fractured zones in the surrounding rock, displacement of tunnel walls, and surrounding rock pressure. It discussed the reasonable range of values for the lining permeability coefficient and further explored the effects of factors such as the characteristics of the weak and fractured zones in surrounding rock, the softening modulus, and the intermediate principal stress on the stability of surrounding rock under conditions of reasonable lining permeability coefficient values. The research findings indicated that as the ratio of the permeability coefficients between the lining and the elastic zone of the surrounding rock increased, the pore water pressure, the radii of the plastic softening and fractured zones, surrounding rock pressure, and tunnel wall displacement all decreased. Conversely, the stress in the weak and fractured zone of the surrounding rock increased. When the permeability coefficient ratio reached a certain threshold , these parameters tended to stabilize. Considering the safety of tunnel lining structures, the stability of surrounding rock, and the capacity to resist deformation, was deemed relatively reasonable. Further results revealed that the softening modulus of the surrounding rock had the most significant effect on the radius of the fractured zone. Additionally, the intermediate principal stress had a pronounced impact on the deformation of the surrounding rock and the expansion of the weak and fractured zone, exhibiting notable interval symmetry.
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