Soil‐structure interaction in tunnel lining analyses

Abstract

There are various methods for the analysis of the interactional behavior of the surrounding land, using the lining structure which is the most common method of deigning lining structure tools for the static loads by using the hyper static methods. In recent years, there has been a question that depicts whether this method provides the best results in designing the tunnel structure or not. Due to the nonlinear behavior of the earth surrounding the lining structure, utilizing the lining method could lead to conservative results in the design. If it is possible to somehow find the forces caused by the real behavior of the land surrounding the lining structure influencing the structure and conduct the design based on them, more optimal results would be obtained. This study is based on the actual behavior of the land surrounding the lining structure and the displacement of the structure caused by forces with linear behavior in the static design according to the non-linear behavior of the land around the tunnel structure. The behavior is modeled using the non-linear programs and the forces affecting the lining of the structure will be inference. Also there is a case study based on this method in which the soil interaction with the tunnel analysis and designing the lining structure was first performed and eventually the obtained results were compared with the hyper static method. In this paper, analysis of maintenance system with lower thicknesses considering land-shield, indicated that applying the reinforced concrete with 40cm thickness has the potential to tolerate the applied load but lining with 45cm thickness is capable of tolerating the loads of design and it can be concluded that applying the simulation method combined with the soil and structure besides considering the nonlinear behavior of the soil leads to more economical results in a project.

Analytic Solutions of the Forces and Displacements for Multicentre Circular Arc Tunnels

“…Similarly, the stress components of any point in the surrounding rock mass can be solved by substituting (14) into (7).…”

“…The stresses of the lining and surrounding rock mass can be determined using (7) once the six analytic functions are determined. And then the displacement can be determined using (11) and (12).…”

“…Using the above method, the conformal mapping function can be expressed as follows: As shown in Figure 2(b), the lining boundaries before and after mapping have a good agreement. (7) with (13), the stress components for any points of the lining can be obtained by the following equations:…”

“…However, these numerical results are mostly applied to certain examples and are difficult to give an understanding of how final solutions are influenced by different parameters. Behnen et al (2015) pointed out that a design strategy based on comprehensible analytical models in combination with the valuable knowledge of experienced engineers should be preferred instead of relying on the complex simulation models [7].…”

Mechanized tunneling induced ground movement and its dependency on the tunnel volume loss and soil properties

“…This coincides with the research of Rott et al where they found that the ratio of horizontal and vertical displacements are highly influenced by the values of K 0 . Möller and Vermeer and Behnen et al highlighted the importance of modeling soil‐structure interaction in tunneling simulation, which affects the stress distribution around the tunnel and induces effects to the ground surface. However, the components that contribute to surface volume loss during tunneling process are not clearly elaborated, and there is no study on the evaluation of the influence of tunnel volume loss on the surface volume loss by taking into account the contribution of soil compressibility, as well as elasticity, and plasticity of soil.…”