EFFECT OF GROUNDWATER LEVEL ON SITE RESPONSE BEHAVIOR OF A ONE-LAYERED LIQUEFIABLE SOIL

Yıl 2021, Cilt: 9 Sayı: 3, 796 - 808, 21.09.2021

Selçuk Demir

https://doi.org/10.21923/jesd.901500

Öz

This study examines the effect of groundwater level ( ) on the seismic site response behavior of a one-layered liquefiable soil using one-dimensional nonlinear numerical analyses. The response of the liquefiable soil was analyzed with the help of DeepSoil open-source software. The calibration of the numerical model was carried out using the results of a centrifuge experiment from the literature. The outcomes of the site response analyses were discussed in terms of peak horizontal acceleration, amplification ratio, excess pore pressure ratio, shear stress-strain behavior, and maximum lateral displacement. Also, additional numerical analyses were performed to investigate relationships between input motion intensity- , frequency content of earthquake motion- , and layer thickness- . It is shown that the seismic site response behavior of the liquefiable soil is highly affected by changes in groundwater levels. Moreover, depending on the location of the groundwater level, the seismic behavior of the liquefiable soil may also change with the increase of the input motion intensity, frequency content, and layer thickness.

Anahtar Kelimeler

Liquefiable Soil, Site Response Analysis, DeepSoil, Numerical Model, Groundwater Level

Tek tabakalı sıvılaşabilir bir zeminin saha tepki davranışı üzerine yeraltı suyu seviyesinin etkisi

Öz

Bu çalışma, yeraltı suyu seviyesinin ( ) tek tabakalı sıvılaşabilir bir zeminin sismik saha tepki davranışına olan etkisini doğrusal olmayan tek boyutlu sayısal analizler kullanılarak incelemektedir. Sıvılaşabilir zeminin tepkisi, bir açık kaynak yazılımı olan DeepSoil yardımıyla analiz edilmiştir. Sayısal modelin kalibrasyonu literatürde yer alan bir santrifüj deneyinin sonuçları kullanılarak yapılmıştır. Analiz sonuçları maksimum yatay ivme, büyütme oranı, artık boşluksuyu basıncı oranı, kayma gerilmesi-kayma şekil değiştirmesi davranışı ve maksimum yanal yer değiştirme açısından tartışılmıştır. Ayrıca, girdi deprem hareketi büyüklüğü- , deprem hareketinin frekans içeriği- ve tabaka kalınlığı- arasındaki ilişkileri araştırmak için ek sayısal analizler yapılmıştır. Sonuçlar, zeminin sismik saha davranışının, yeraltı su seviyesinin değişmesinden oldukça etkilendiğini göstermektedir. Ayrıca, yeraltı suyu seviyesinin konumuna bağlı olarak, sıvılaşabilir zeminin sismik davranışı giriş hareket yoğunluğunun, frekans içeriğinin ve tabaka kalınlığının artmasıyla değişebilmektedir.

Anahtar Kelimeler

Sıvılaşabilir Zemin, Saha Tepki Analizi, DeepSoil, Sayısal Model, Yeraltı Suyu Seviyesi

Kaynakça

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