Investigation of the Interface Shear Behavior of Geomembranes Under the Influence of Salt Water

Inci Develioglu; Hasan Fırat Pulat

Makale detayları

Investigation of the Interface Shear Behavior of Geomembranes Under the Influence of Salt Water

Yazarlar:

Inci Develioglu | Hasan Fırat Pulat

Yayıncı:

Afyon Kocatepe University

Ana Başlıklar:

İnşaat Mühendisliği

Dergi:

Afyon Kocatepe Üniversitesi Fen Ve Mühendislik Bilimleri Dergisi Vol.23 Issue 2, pp.448-458

Belge Tipi:

Makale

Yayın Tarihi:

3/2023

Belge Dili:

Türkçe

Document ID (Org No.):

2001288774

pISSN:

2149-3367

Anahtar kelimeler:

Özet:

 In the design of construction foundations, the importance of shear verification has been emphasized in many codes and academic studies. Considering the soil properties and application conditions during the calculations, if the shear behavior of geomembranes, which is an effective interface element and used for insulation, is ignored, and if the shear strength between the geomembrane and the structural element is lower than the shear resistance used in the design, significant problems may be encountered. In order to prevent possible loss of life and property, all interfaces in the system should be carefully examined. In this study, the interface shear behavior between two different geomembranes and the clayey soil taken from the coastal part of Izmir province, Karsiyaka district, Mavisehir was investigated. Geomembrane types are polyvinyl chloride PVC and thermoplastic polyolefin TPO. The thickness of the TPO geomembrane is 1.5 mm, while the thickness of the PVC geomembrane is 1.5 and 3.0 mm. Interface shear strength parameters were determined by mediumscale direct shear tests. Direct shear tests were carried out with uncured geomembranes and cured in 0.5 molar saltwater for 4, 8, and 16 months. While the soil  TPO interface has the highest shear strength and friction angle, the soil  PVC1.5 interface has the lowest shear strength and friction angle. The same situation was obtained for geomembranes cured in saltwater. After curing in salt water, the geomembrane whose interface friction angle decreased the most was 1.5 mm PVC, while the least decreased geomembrane was 3.0 mm PVC.

 In the design of construction foundations, the importance of shear verification has been emphasized in many codes and academic studies. Considering the soil properties and application conditions during the calculations, if the shear behavior of geomembranes, which is an effective interface element and used for insulation, is ignored, and if the shear strength between the geomembrane and the structural element is lower than the shear resistance used in the design, significant problems may be encountered. In order to prevent possible loss of life and property, all interfaces in the system should be carefully examined. In this study, the interface shear behavior between two different geomembranes and the clayey soil taken from the coastal part of Izmir province, Karsiyaka district, Mavisehir was investigated. Geomembrane types are polyvinyl chloride PVC and thermoplastic polyolefin TPO. The thickness of the TPO geomembrane is 1.5 mm, while the thickness of the PVC geomembrane is 1.5 and 3.0 mm. Interface shear strength parameters were determined by mediumscale direct shear tests. Direct shear tests were carried out with uncured geomembranes and cured in 0.5 molar saltwater for 4, 8, and 16 months. While the soil  TPO interface has the highest shear strength and friction angle, the soil  PVC1.5 interface has the lowest shear strength and friction angle. The same situation was obtained for geomembranes cured in saltwater. After curing in salt water, the geomembrane whose interface friction angle decreased the most was 1.5 mm PVC, while the least decreased geomembrane was 3.0 mm PVC.

 In the design of construction foundations, the importance of shear verification has been emphasized in many codes and academic studies. Considering the soil properties and application conditions during the calculations, if the shear behavior of geomembranes, which is an effective interface element and used for insulation, is ignored, and if the shear strength between the geomembrane and the structural element is lower than the shear resistance used in the design, significant problems may be encountered. In order to prevent possible loss of life and property, all interfaces in the system should be carefully examined. In this study, the interface shear behavior between two different geomembranes and the clayey soil taken from the coastal part of Izmir province, Karsiyaka district, Mavisehir was investigated. Geomembrane types are polyvinyl chloride PVC and thermoplastic polyolefin TPO. The thickness of the TPO geomembrane is 1.5 mm, while the thickness of the PVC geomembrane is 1.5 and 3.0 mm. Interface shear strength parameters were determined by mediumscale direct shear tests. Direct shear tests were carried out with uncured geomembranes and cured in 0.5 molar saltwater for 4, 8, and 16 months. While the soil  TPO interface has the highest shear strength and friction angle, the soil  PVC1.5 interface has the lowest shear strength and friction angle. The same situation was obtained for geomembranes cured in saltwater. After curing in salt water, the geomembrane whose interface friction angle decreased the most was 1.5 mm PVC, while the least decreased geomembrane was 3.0 mm PVC.

 Yapı temellerinin tasarımında, kayma tahkikinin önemi birçok yönetmelik ve akademik çalışmada vurgulanmıştır. Hesaplamalar sırasında zemin özellikleri ve uygulama koşulları dikkate alınırken yalıtım amacıyla kullanılan ve etkili bir ara yüzey elemanı olan geomembranların kayma davranışları göz ardı edildiği taktirde ve geomembran ile yapı elemanı arasındaki kayma mukavemetinin tasarımda kullanılan kayma direncinden daha düşük olması durumunda önemli problemlerle karşılaşılabilir. Olası can ve mal kayıplarının önüne geçebilmek için sistemde var olan tüm ara yüzeylerin dikkatle irdelenmesi gerekir. Bu çalışmada, iki farklı geomembran ile İzmir, Karşıyaka, Mavişehir sahil şeridinden alınan deniz suyu etkisindeki killi zeminin ara yüzey kayma davranışı incelenmiştir. Polivinil klorür PVC geomembranın kalınlıkları 1.5 ve 3.0 mm ve TPO geomembranın kalınlığı 1.5 mm dir. Ara yüzey kayma dayanımı parametreleri orta ölçekli direk kesme deneyleri ile belirlenmiştir. Direk kesme deneyleri 0.5 molar 0.5M tuzlu suda 4, 8 ve 16 ay kür edilmiş ve kür edilmemiş geomembranlar ile gerçekleştirilmiştir. Zemin  TPO ara yüzeyi en büyük kayma dayanımı ve sürtünme açısına sahipken en düşük kayma dayanımı ve sürtünme açısızemin  PVC1.5 ara yüzeyine aittir. Tuzlu suda kür edildikten sonra ara yüzey sürtünme açısı en fazla azalan geomembran 1.5 mm PVC iken en az azalan geomembran 3.0 mm PVC olmuştur.

Makale detayları

Investigation of the Interface Shear Behavior of Geomembranes Under the Influence of Salt Water

Yazarlar:

Inci Develioglu | Hasan Fırat Pulat

Yayıncı:

Afyon Kocatepe University

Ana Başlıklar:

İnşaat Mühendisliği

Dergi:

Afyon Kocatepe Üniversitesi Fen Ve Mühendislik Bilimleri Dergisi Vol.23 Issue 2, pp.448-458

Belge Tipi:

Makale

Yayın Tarihi:

3/2023

Belge Dili:

Türkçe

Document ID (Org No.):

2001288774

pISSN:

2149-3367

Geomembrane

Interface shear strength

Saltwater

Medium scale direct shear testGeomembran

; Ara yüzey kayma dayanımı

Tuzlu su

Orta ölçekli direk kesme deneyi

Sayı

Makale detayları

Yazarlar: Inci Develioglu | Hasan Fırat Pulat

Yayıncı: Afyon Kocatepe University

Ana Başlıklar: İnşaat Mühendisliği

Dergi: Afyon Kocatepe Üniversitesi Fen Ve Mühendislik Bilimleri Dergisi Vol.23 Issue 2, pp.448-458

Belge Tipi: Makale

Yayın Tarihi: 3/2023

Belge Dili: Türkçe

Document ID (Org No.): 2001288774

pISSN: 2149-3367

Sayı

Yazarlar:

Inci Develioglu | Hasan Fırat Pulat

Yayıncı:

Afyon Kocatepe University

Ana Başlıklar:

İnşaat Mühendisliği

Dergi:

Afyon Kocatepe Üniversitesi Fen Ve Mühendislik Bilimleri Dergisi Vol.23 Issue 2, pp.448-458

Belge Tipi:

Makale

Yayın Tarihi:

3/2023

Belge Dili:

Türkçe

Document ID (Org No.):

2001288774

pISSN:

2149-3367