Abstract
The finite element limit analysis method is applied to study the reinforcement concrete immersed tunnel at seabed under earthquake in this paper. FLAC3D is adopted to establish the equivalent model of reinforcement concrete, and the solution is executed according to elastic-plastic plane problem. Firstly, it is indicated that there are extreme strain values for concrete and reinforcement concrete, and the finite element limit method is adopted to calculate the ultimate shear strain value of equivalent material test pieces of reinforcement concrete of immersed tunnel so as to judge whether the immersed tube failures, thus, a new failure criteria for finite element limit analysis of immersed tunnel is provided. Secondly, the location and shape of failure surface of the immersed tunnel are simulated and its safety factor is obtained, and relation curve between subsidence displacement of top plate and strength reduction factors is combined to analyze the whole failure process of immersed tube. Finally, the influence law for safety factors of immersed tunnel under the function of different seismic wave.
Highlights
The subsea tunnel drives the sustainable highspeed development of coastal economy and ocean development in our country and has such characteristics as no obstruction for airline and no influence on ecological environment
The study method used for dynamic stability analysis on earthquake for subsea tunnel mainly covers the quasi-static method, reaction displacement and finite element method [1,2,3]
The authors have completed the stability analysis on finite element strength reduction for reinforced concrete immersed tunnel at seabed under static force condition; following basic conclusions can be used for stability analysis on earthquake dynamic for immersed tunnel
Summary
The authors have completed the stability analysis on finite element strength reduction for reinforced concrete immersed tunnel at seabed under static force condition; following basic conclusions can be used for stability analysis on earthquake dynamic for immersed tunnel
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