Numerical analysis of corrugated steel reinforced shield tunnel under complex stress path
WEI Gang1,2, XU Tianbao3, ZHANG Zhiguo4
1. Department of Civil Engineering, Hangzhou City University, Hangzhou 310015, Zhejiang, China; 2. Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province, Hangzhou 310015, Zhejiang, China; 3. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, Anhui, China; 4. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Abstract: In order to probe into the similarities and differences of the stress-deformation law and the reinforcement effect of shield tunnel strengthened with corrugated steel under complex stress paths, a refined model of three-ring staggered joints was established based on the finite element software MIDAS GTS NX, the effect of corrugated steel reinforcement was evaluated from the angle of convergent deformation, corrugated steel stress and plastic deformation of segments before and after reinforcement, the stress and deformation evolution of shield tunnel strengthened with corrugated steel under loading and unloading conditions were analyzed. The results showed that the distribution of the maximum convergent deformation was different in the complex loading environment. The waist was the main part of the loading, and the top and bottom was the main part of the unloading under unloading, the effect of corrugated steel reinforcement was better than that under surcharge loading, and the maximum reinforcement efficiency could reach 70%, the convergent deformation and the stress development of corrugated steel with different plate thicknesses were similar and showed a linear increasing trend, while corrugated steel could effectively delay the plastic development of concrete, however, the ability of stagger suppression between rings under unloading condition was weak.
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2023, Vol. 5 
