Abstract
The evaluation of the trench stability under the action of ocean waves is an important issue in the construction of an immersed tunnel. In this study, a two-dimensional coupling model of a wave-seabed-immersed tunnel is proposed for the dynamic responses of a trench under wave action in the immersing process of tunnel elements. The porous seabed is characterized by Biot consolidation equations. The k − ε model and RANS equation are adopted to achieve the flow field simulation, and the level set method (LSM) is used to capture the free surface between the water and air. The proposed numerical model is verified using the experimental data and analytical results. Then, the transient liquefaction and shear failure in the vicinity of the trench are discussed at two different conditions, namely, after the foundation groove is excavated and after the tunnel element is placed. The pore pressure amplitude on the weather side slope is demonstrated to be significantly smaller than that on the lee side slope. Also, the distribution of the surrounding flow field and pressure field change dramatically after the tunnel element is settled, leading to the significant changes of seabed stability.
Highlights
With the development of ground transportation, inland river transportation and sea transportation, there is an increasing demand for channels across the river and sea
Its applicability and reliability have been verified through many successful cases of immersed tube tunnels around the world such as the Oresund tunnel between Denmark and Sweden, as well as the Hong Kong-Zhuhai-Macao immersed tunnel in China
The structure is sensitive to the uneven settlement of the foundation as the immersed tube tunnel could be regarded as nearly infinite in length direction compared with its section size
Summary
With the development of ground transportation, inland river transportation and sea transportation, there is an increasing demand for channels across the river and sea. Many researchers used various analytical formulas, which assume that the seabed is flat, to study the dynamic response of the porous seabed under linear waves [17,18,19]. This method is difficult to consider the existence of the structure. A coupling model of the wave-seabed-tunnel is proposed to study the transient response of the soil in the vicinity of a trench and the flow field distribution nearby.
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