Finite element analysis for the twin metro tunnel constructed in Ankara Clay, Turkey

Karakus, Murat; Özsan, Aydın; Başarır, Hakan

doi:10.1007/s10064-006-0056-z

Cited by 75 publications

(17 citation statements)

References 6 publications

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“…Jaehong, et al conducted a dynamic analysis to investigate the spacing influence and the seismic affection on the mechanical behavior of a double-arch culver [5]. Karakus, et al analyzed the convergence of twin tunnels in Turkey by using the finite element method [6]. Chen, et al have gained an understanding of the stress redistribution and pressure-arch development during tunnel excavation by using a three-dimensional numerical model [7].…”

Section: State Of the Artmentioning

confidence: 99%

Skewed Pressure Characteristics of Equivalent Load in Double-Arch Tunnel

Wang

et al. 2016

J. Eng. Technol. Sci.

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Abstract. It is of great importance to reasonably estimate the surrounding rock load of a double-arch tunnel for the design, construction and stability evaluation of the tunnel. Currently, the basic theory on surrounding rock pressure of doublearch tunnels is insufficient for properly making the design and calculations. Generally, simplified calculations based on experience are used, such as the calculation method of Protodyakonov's theory, the building code method and others. Considering the fact that the surrounding rock pressure of double-arch tunnels has skewed distribution characteristics, a computational model of a double-arch tunnel was built using data from an actual excavation of a highway tunnel. Taking some factors into consideration, such as different stress states, different construction methods and different sizes of double-arch tunnels, the pressure evolution of the surrounding rock was analyzed during step-by-step excavation of the double-arch tunnel. The results showed that in each condition the surrounding rock pressure of the double-arch tunnel displayed skewed distribution characteristics. The skewed distribution of the surrounding rock pressure varied with changes in stress state, construction sequence and excavation size. The skewed pressure of the double-arch tunnel was converted to equivalent load. The conversion method and distribution characteristics of the equivalent load are specified. They have important theoretical significance and practical value for similar engineering practices.

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Section: State Of the Artmentioning

confidence: 99%

Skewed Pressure Characteristics of Equivalent Load in Double-Arch Tunnel

Wang

et al. 2016

J. Eng. Technol. Sci.

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“…The first summation represents the coefficient c ij (y) of eqn (1), which contributes in the matrix Δp of eqn (9). Before calculating it all coefficients c ijs , one for each domain, must be known.…”

Section: Alternative Multi-region Formulationmentioning

confidence: 99%

“…The finite element method (FEM) is still popular (Karakus et al [1]), however has some disadvantages when compared to other options such as the boundary element method (BEM). The FEM requires the discretization of the infinite domain, implying on a high number of elements and leading to a large and sometimes impracticable processing time.…”

Section: Introductionmentioning

confidence: 99%

Analyzing layered soil problems with an alternative multi-region BEM technique and a new infinite boundary element formulation

Ribeiro

Paiva

2010

Boundary Elements and Other Mesh Reduction Methods XXXII

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The main objective of this work is to obtain an efficient three-dimensional boundary element (BE) formulation for layered soil simulation. This formulation is obtained by combining an alternative multi-region technique with an infinite boundary element (IBE) formulation. Kelvin fundamental solutions are employed, considering the static analysis of isotropic and linear-elastic domains.Establishing relations between the displacement fundamental solutions of the different domains, the alternative technique used in this paper allows analyzing all domains as a single solid, not requiring equilibrium or compatibility equations. This approach also leads to a smaller system of equations when compared to the usual subregion technique, and the results obtained are more accurate.The two-dimensionally mapped infinite boundary element (IBE) formulation here used is based on a triangular BE with linear shape functions. One advantage of this formulation over quadratic or higher order elements is that no additional degrees of freedom are added to the original BE mesh by the presence of the IBEs. Thus, the IBEs allow the mesh to be reduced without compromising the accuracy of the result.The use of IBEs improves the advantages of the alternative multi-region technique, contributing for the low computational cost and allowing a considerable mesh reduction. Furthermore, the results show good agreement with the ones given in other work, confirming the accuracy of the presented formulation.

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“…With the rapid developing of underground space and the improvement of underground engineering technology, vertically overlapping tunnels (with vertical alignment) have been widely used for the urban subway and other underground transportation system in many large cities, for instance, the twin metro tunnels in Ankara, Turkey (Karakus et al 2007), in Tehran, Iran (Chakeri et al 2011), and in Wuhan, China . On the other hand, it has been observed that the underground tunnel may suffer from serious damage in great earthquakes, such as Taiwan Chi-Chi (Wang et al 2001) earthquakes.…”

Section: Introductionmentioning

confidence: 99%

Dynamic interaction of twin vertically overlapping lined tunnels in an elastic half space subjected to incident plane waves

2016

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The scattering of plane harmonic P and SV waves by a pair of vertically overlapping lined tunnels buried in an elastic half space is solved using a semi-analytic indirect boundary integration equation method. Then the effect of the distance between the two tunnels, the stiffness and density of the lining material, and the incident frequency on the seismic response of the tunnels is investigated. Numerical results demonstrate that the dynamic interaction between the twin tunnels cannot be ignored and the lower tunnel has a significant shielding effect on the upper tunnel for high-frequency incident waves, resulting in great decrease of the dynamic hoop stress in the upper tunnel; for the low-frequency incident waves, in contrast, the lower tunnel can lead to amplification effect on the upper tunnel. It also reveals that the frequency-spectrum characteristics of dynamic stress of the lower tunnel are significantly different from those of the upper tunnel. In addition, for incident P waves in low-frequency region, the soft lining tunnels have significant amplification effect on the surface displacement amplitude, which is slightly larger than that of the corresponding single tunnel.

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Finite element analysis for the twin metro tunnel constructed in Ankara Clay, Turkey

Cited by 75 publications

References 6 publications

Skewed Pressure Characteristics of Equivalent Load in Double-Arch Tunnel

Skewed Pressure Characteristics of Equivalent Load in Double-Arch Tunnel

Analyzing layered soil problems with an alternative multi-region BEM technique and a new infinite boundary element formulation

Dynamic interaction of twin vertically overlapping lined tunnels in an elastic half space subjected to incident plane waves

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