3-DIMENSIONAL NUMERICAL MODELING OF TUNNEL INDUCED DEFORMATION FIELD (NECATIBEY SUBWAY STATION, ANKARA, TURKEY)

2011-06-25
AKTÜRK, ÖZGÜR
Doyuran, Vedat
In heavily settled areas, deformations induced by the tunnel excavation may cause serious damage to nearby structures. Therefore, it is necessary to study effective means of controlling tunnel induced deformations. The main parameters affecting the failure and deformation state of the soil around a circular underground opening are the physical characteristics of the soil, the diameter of the opening, and the support pressure. In this study, 3-Dimensional (3D) FDM analyses were conducted to assess tunneling induced deformations, along with movements around Necatibey Station of Kizilay-Cayyolu metro line (Ankara, Turkey). During sequential excavations, temporary and permanent shotcrete lining was also simulated. The soil behavior is assumed to be governed by an elastic-perfectly plastic constitutive relation based on the Mohr Coulomb criterion. The computed deformations around these openings have been compared with the in-situ measurements. The results of the study revealed that the 3-D elasto-plastic analyses yield comparably good correlation with the in-situ measurements.

Suggestions

Assessment of tunnel induced deformation field through 3-dimensional numerical models (Necatibey subway station, Ankara, Turkey)
Aktürk, Özgür; Doyuran, Vedat; Department of Geological Engineering (2010)
In heavily settled areas, deformations induced by the tunnel excavation may cause serious damage to nearby structures. In this study it is aimed to model ground deformations induced by main tunnels and connection tunnels excavations as well as groundwater drainage. Therefore, it is necessary to study effective means of controlling tunnel induced deformations. The main parameters affecting the failure and deformation state of the soil around a circular underground opening are the physical characteristics of ...
Numerical comparison of retaining system behavior for a deep excavation case with and without ground improvement
Maghsoudloo, Arash; Ahmadinaghadeh, Reza; Toker, Nabi Kartal (2012-11-02)
In the construction of deep excavations in urban areas, the safety of adjacent ground and structures becomes major concern for engineers. In soft clays, the main reason for occurrence of large deflections of soil support systems in excavations is instability of the excavation base. This paper will focus on analyzing and comparing design of an excavation with and without jet grout improvement applied to the excavation base by employing the finite-element code PLAXIS. A well-documented case study is analyzed,...
Seismic vulnerability, behavior and design of tunnel form building structures
Balkaya, C; Kalkan, E (Elsevier BV, 2004-12-01)
Multi-story reinforced concrete tunnel form buildings are one of the common structural types in regions prone to high seismic risk due to the buildings inherent earthquake resistance and ease of construction. Despite their good performance during earthquakes in 1999 in Turkey, and abundance of such structures scattered worldwide, current seismic codes and design provisions provide insufficient guidelines for their seismic design. As a compensatory measure, a series of modal and nonlinear static analyses are...
Nonlinear analysis of RC frames retrofitted with structural steel elements
Akpınar, Uğur; Binici, Barış; Department of Civil Engineering (2010)
Deficient concrete structures are serious danger in seismic zones. In order to minimize economical and human loss, these structures should be retrofitted. Selecting suitable retrofitting schemes requires detailed investigation of these systems. Considering these facts, this study aims to calibrate analytical models of systems with chevron braces and internal steel frames; and evaluate their seismic performances. First, analytical models of the frames with braces and internal steel frames were prepared and t...
Structural monitoring of andirap bridge for overload passage
Türer, Ahmet (2009-01-01)
Andirap bridge is located over Seyhan river passing a deep valley and has a big strategic importance since heavy loaded trucks carrying excavation and fill material from Kavsak Bendi hydroelectric power plant construction site have to use the bridge. Serious concerns were raised since Andirap bridge may not be adequately strong to carry about 250 trucks per day, each weighting more than 50 tons for the coming next two years. A preliminary visual and analytical evaluation of the bridge has leaded instrumente...
Citation Formats
Ö. AKTÜRK and V. Doyuran, “3-DIMENSIONAL NUMERICAL MODELING OF TUNNEL INDUCED DEFORMATION FIELD (NECATIBEY SUBWAY STATION, ANKARA, TURKEY),” Albena, BULGARIA, 2011, p. 331, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/64522.