Elasto-plastic analysis of circular tunnel based on strain nonlinear softening

Li-ming Zhang; Zai-quan Wang

doi:10.1117/12.839385

25 August 2009 Elasto-plastic analysis of circular tunnel based on strain nonlinear softening

Li-ming Zhang, Zai-quan Wang

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73756M (2009) https://doi.org/10.1117/12.839385
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

The elastic-nonlinear softening-residual plastic surrounding rock mode1 is analyzed. According to the total strain theory, the relationship between equivalent stress and equivalent strain is deduced from uniaxial compression of practical rock. The relational expressions are related with triaxial stress (σ_θ, σ_z, and σ_r) and triaxial strain (ε_θ, ε_z, and ε_r) of surrounding rock. The mechanism of load bearing and acting relation between surrounding rock and support are studied. Stress and displacement distribution of broken zone, plastic zone and elastic zone of tunnel are presented out. The ultimate bearing capacity of surrounding rock is given. The critical pressure leading to yield firstly of surrounding rock that caused by inner pressure is introduced. The obtained results are more closely to actual values of surrounding rock than Kastner's formula. The ideal plastic model and the brittle model are special cases of the proposed solution.

Citation Download Citation

Li-ming Zhang and Zai-quan Wang "Elasto-plastic analysis of circular tunnel based on strain nonlinear softening", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73756M (25 August 2009); https://doi.org/10.1117/12.839385

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