Stability Analysis of the Surrounding Rock-Lining Structure in Deep-Buried Hydraulic Tunnels Having Seepage Effect

Haibo Jiang, Helin Sun, Kebin Shi and Juncai Xu ()
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Haibo Jiang: College of Water and Architectural Engineering, Shihezi University, Shihezi 832000, China
Helin Sun: College of Water and Architectural Engineering, Shihezi University, Shihezi 832000, China
Kebin Shi: College of Hydraulic and Civil Engineering, Xinjiang Agriculture University, Urumqi 830052, China
Juncai Xu: Department of Civil Engineering, Case Western Reserve University, Cleveland, OH 44106, USA

Sustainability, 2022, vol. 14, issue 24, 1-15

Abstract: To clarify the factors affecting the stability of deep-buried hydraulic tunnels containing pore water, the elastoplastic theory and the Mogi-Coulomb strength criterion were used to derive the analytical solutions of stress on the surrounding rock-lining structure, tunnel wall displacement, and plastic zone radius in surrounding rock under different operating conditions. During this process, the seepage effect and surrounding rock-lining interaction were considered. The influencing rules of seepage action, intermediate principal stress coefficient, lining permeability coefficient, and lining thickness on the stability of the surrounding rock-lining structure were investigated in depth. The results show that the seepage effect significantly changed the stress distributions in the lining structure and surrounding rock, reduced the bearing reaction force, and lowered the tunnel stability. The bearing reaction force was decreased considerably from the intermediate principal stress, and the plastic zone radius in the surrounding rock and the tunnel wall displacement was obviously reduced. Moreover, the bearing reaction force was reduced, and the plastic zone radius in the surrounding rock and the tunnel wall displacement was increased with the decrease of the lining permeability coefficient. With increasing the lining thickness, the bearing reaction force was enhanced, and an apparent restriction on the development of plastic zone in the surrounding rock appeared at the beginning, but the restriction effect weakened subsequently. This research can theoretically provide references for analyzing the stability of hydraulic tunnels containing pore water.

Keywords: Mogi-Coulomb strength criterion; circular tunnel; surrounding rock-lining interaction; seepage effect; permeability coefficient of lining; lining thickness (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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