Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Analytical Approach for Evaluating the Dynamic Self-Bearing Capacity of Tunnels
The self-bearing capacity of tunnels possesses a dynamic evolution process. However, there is a limited advanced knowledge to evaluate the dynamic self-bearing capacity of tunnels quantitatively. In this paper, the time-dependent self-bearing factor of the tunnel surrounding rock is proposed, and an analytical approach for the circular excavations is developed. In this paper, the rock mass is regarded as a viscous material with a distinguishable strain-strengthening property. The stress states around circular excavations are determined using the Drucker–Prager criterion and the power-hardening constitutive model. Then, the Burger-creep viscoplastic model is introduced to evaluate the time-dependent deformations. Finally, the formula of a time-dependent self-bearing factor of tunnels is obtained. The sensibilities of time-dependent self-bearing factor and time-dependent deformation of tunnels to the incorporated model parameters are investigated in depth. Effects of incorporated model parameters on time-dependent self-bearing factor and time-dependent deformation of tunnels are consistent with their physical meanings. This paper provides an analytical approach for quantitatively evaluating the dynamic evolution process of the self-bearing capacity of tunnels.
Analytical Approach for Evaluating the Dynamic Self-Bearing Capacity of Tunnels
The self-bearing capacity of tunnels possesses a dynamic evolution process. However, there is a limited advanced knowledge to evaluate the dynamic self-bearing capacity of tunnels quantitatively. In this paper, the time-dependent self-bearing factor of the tunnel surrounding rock is proposed, and an analytical approach for the circular excavations is developed. In this paper, the rock mass is regarded as a viscous material with a distinguishable strain-strengthening property. The stress states around circular excavations are determined using the Drucker–Prager criterion and the power-hardening constitutive model. Then, the Burger-creep viscoplastic model is introduced to evaluate the time-dependent deformations. Finally, the formula of a time-dependent self-bearing factor of tunnels is obtained. The sensibilities of time-dependent self-bearing factor and time-dependent deformation of tunnels to the incorporated model parameters are investigated in depth. Effects of incorporated model parameters on time-dependent self-bearing factor and time-dependent deformation of tunnels are consistent with their physical meanings. This paper provides an analytical approach for quantitatively evaluating the dynamic evolution process of the self-bearing capacity of tunnels.
Analytical Approach for Evaluating the Dynamic Self-Bearing Capacity of Tunnels
Yu, Jin (Autor:in) / Ren, Chonghong (Autor:in) / Cai, Yanyan (Autor:in) / Yao, Wei (Autor:in) / Liu, Xueying (Autor:in)
20.05.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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