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A Study of the Basic Issues Regarding the Swelling Pressure Analytical Solution for Mountain Tunnels
(1 Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031; 2 Kunming Survey, Design and Research Institute Co. Ltd. of CREEC, Kunming 650200)
Abstract The swelling tendency of expansive rock not only results in the obvious manifestation of supporting structure stress and deformation at the construction stage, but also has a long-term "post-loading effect" during the operation stage, which is different from general tunnels. Based on the principle of elastic mechanics, this paper derives the analytical solution of tunnel support structure stress and deformation under different swelling conditions of surrounding rock. It also analyzes the theoretical relationship between the tunnel support structure stress and deformation and their distribution law regarding the variations of the rock swelling rate, structure support rigidity, and rock swelling pressure. Using a project as an example, the finite element method is adopted for verification, and the results prove that this analytical solution has a certain degree of reliability and can provide a basis for tunnel design and construction as well as a long-term safety evaluation for completed structures.
Abstract：
The swelling tendency of expansive rock not only results in the obvious manifestation of supporting structure stress and deformation at the construction stage, but also has a long-term "post-loading effect" during the operation stage, which is different from general tunnels. Based on the principle of elastic mechanics, this paper derives the analytical solution of tunnel support structure stress and deformation under different swelling conditions of surrounding rock. It also analyzes the theoretical relationship between the tunnel support structure stress and deformation and their distribution law regarding the variations of the rock swelling rate, structure support rigidity, and rock swelling pressure. Using a project as an example, the finite element method is adopted for verification, and the results prove that this analytical solution has a certain degree of reliability and can provide a basis for tunnel design and construction as well as a long-term safety evaluation for completed structures.
LI Hua-Yun-1,
Zhang-Zhi-Qiang-1,
Zhang etc
.A Study of the Basic Issues Regarding the Swelling Pressure Analytical Solution for Mountain Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(1): 54-61
2014, Vol. 51 