Zemin-hücresel dolgu elemanlarının sürtünme davranışlarının laboratuvarda yapılan çekme deneyleri ile belirlenmesi

Yıl 2020, Cilt: 35 Sayı: 1, 27 - 38, 25.10.2019

Adem Işık , Ayhan Gürbüz , Özgür Anıl

https://doi.org/10.17341/gazimmfd.639893

Cited By: 3

Öz

Bu çalışma kapsamında, zemin-hücresel dolgu elemanı
arasındaki sürtünme davranışı laboratuvarda yapılan büyük ölçekli çekme deney
düzeneği ile belirlenmiştir. Büyük ölçekli çekme deney kutusu (1500 mm uzunluk,
1000 mm genişlik ve 700 mm yükseklik) zemin-hücresel dolgu elemanı arasındaki
davranışı belirlemek için Gazi Üniversitesi laboratuvarında tasarlanmış ve inşa
edilmiştir. Toplam olarak 18 adet çekme deneyi 10, 25 ve 50 kPa üniform düşey
yükler altında yapılmıştır. Kullanılan zemin malzemesi kötü derecelendirilmiş
kum olup özgül ağırlığı (G_s)
2,67, ortalama dane çapı (D₅₀)
1,6 mm, maksimum ve minimum boşluk oranları sırasıyla 0,79 ve 0,43, maksimum ve
minimum kuru birim hacim ağırlıkları ise sırasıyla 18,10 ve 14,52 kN/m³
olarak belirlenmiştir. Model deney düzeneğinde sıkıştırılmış olarak
yerleştirilen kum malzemesinin %50 rölatif sıkılıkta kayma mukavemeti açısı 39˚
olarak kesme kutusu deneyi ile belirlenmiştir. Hücresel dolgu elemanı boyunca
oluşan deplasmanlar ve deformasyonlar kutu ön yüzünde daha yüksek seviyelere
ulaşmıştır. Bu çalışmada, artan düşey basınç ile çekme kuvvetleri artmıştır. Bu
çalışma kapsamında, geocell elemanların boyutlarının çekme kuvveti üzerine
etkisini belirlemek amacıyla ifade edilen SxL (hücre sayısı x uzunluk)
parametresinin çekme kuvvetleri ile değişimi belirlenmiştir. Artan SxL değeri
ile çekme kuvvetinin de arttığı sonucuna varılmıştır. Ayrıca artan düşey basınçla
hücresel dolgu elemanı-zemin arasındaki ara yüzey sürtünme katsayılarının
düştüğü belirlenmiştir.

Anahtar Kelimeler

Hücresel dolgu elemanı, çekme kuvveti, deplasman, deformasyon, ara yüzey sürtünme katsayısı

Kaynakça

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