Investigation of The Effect of Changes In Ground Water Level On The Seismic Behaviour of A Cantilever Retaining Wall

Yıl 2019, Cilt: 9 Sayı: 2, 307 - 317, 15.04.2019

Utku Köktan , Gökhan Demir , Muzaffer Ertek

https://doi.org/10.17714/gumusfenbil.398875

Öz

In this study, dynamic behavior of a retaining wall for various ground
water levels through soil is investigated in nonlinear time-history analysis
using finite element method. In order to do a more realistic analysis taking
soil-structure interaction into account, the effects of radiational damping and
wave propagation were considered. For this purpose, soil medium has been capped
off within a definite distance from the wall and virtual viscous boundaries
were applied to the vertical free surfaces at both ends of the medium. Special
interface elements were used to better model the behavior between soil and the
wall. The analyses of the retaining wall subject to the study were carried out
by using the finite element software MIDAS GTS NX and the record of San
Fernando Pacoima Dam earthquake which exist in the library of the software.
Direct solution method has been used in the analysis of soil-structure
interaction. The dynamic behavior of the wall in the sequel of the analyses
were probed in terms of stresses and displacements. In consequence of the
results obtained, it has been seen that the soil-structure interaction has a
great importance in the seismic behavior of the retaining wall and the
variations in groundwater level significantly effect the movement of the wall
and the stresses emanating on the wall.

Anahtar Kelimeler

Retaining Wall, Ground Water, Soil-Structure Interaction

Bir Konsol İstinat Duvarının Sismik Davranışına Yeraltı Su Seviyesindeki Değişimlerin Etkisinin İncelenmesi

Öz

Bu
çalışmada bir istinat duvarının, zeminde farklı yeraltı su seviyeleri olması
durumundaki dinamik davranışı zaman tanım alanında sonlu elemanlar yöntemi
kullanılarak incelenmiştir. Zemin-yapı etkileşimini dikkate alarak gerçeğe daha
yakın bir analiz yapabilmek amacıyla radyasyonel sönüm etkileri ve dalga
yayılım etkileri dikkate alınmıştır. Bu amaçla duvardan belirli bir uzaklıkta
zemin ortamı sonlandırılarak zemin ortamının sonundaki düzlemsel serbest
yüzeylere viskoz sanal sınırlar uygulanmıştır. Zemin ile duvar arasındaki
davranışı daha doğru modelleyebilmek için özel arayüzey elemanları
kullanılmıştır. İstinat duvarına ait analizler MIDAS GTS NX sonlu elemanlar
yazılımı ile bu yazılımın kütüphanesinde bulunan San Fernando Pacoima Dam
depremine ait kayıt kullanılarak yapılmıştır. Zemin-yapı etkileşiminin çözümünde
doğrudan çözüm yöntemi kullanılmıştır. Yapılan analizler neticesinde duvarın
dinamik davranışı yerdeğiştirmeler ve gerilmeler cinsinden irdelenmiştir. Elde
edilen sonuçlar neticesinde zemin-yapı etkileşiminin istinat duvarının sismik
davranışında çok büyük önem arz ettiği, yeraltı su seviyesindeki değişimlerin
duvarın hareketini ve duvar üzerinde oluşan gerilmeleri önemli mertebelerde
etkilediği görülmüştür.

Anahtar Kelimeler

İstinat Duvarı, Yeraltı Suyu, Zemin-Yapı Etkileşimi

Kaynakça

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