2D Surface Topography Alterations of Different Geomembrane Liners: Grain Shape, Relative Density and Loading Perspectives

Tanay Karademir

Makale detayları

2D Surface Topography Alterations of Different Geomembrane Liners: Grain Shape, Relative Density and Loading Perspectives

Yazarlar:

Tanay Karademir

Yayıncı:

Osmaniye Korkut Ata Üniversitesi

Ana Başlıklar:

İnşaat Geoteknik Mühendisliği | İnşaat Mühendisliğinde Zemin Mekaniği

Dergi:

Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.7 Issue 5, pp.2346-2363

Belge Tipi:

Makale

Yayın Tarihi:

10/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001326316

pISSN:

2687-3729

Anahtar kelimeler:

Özet:

 Surface topography is of importance in playing a major role for the mobilized mechanical behavior, and hence, the strength-stability performance of composite layered systems containing synthetic geomembrane liner and natural granular sand. The 2D surface topography alterations of different geomembranes were experimentally be studied by performing profile relief measurements for detecting and determining 2D surface topographical characteristics of different geomembrane liner sheets produced from distinctive polymeric resins HDPE, LLDPE, PVC previously subjected to abrasive action of granular sand grains at different relative densities Dr and dissimilar particle shape rounded or angular, and additionally at various loading conditions. The surface topographical characteristics as evident on the detected profiles including asperity features such as size, shape, and spacing of material dislocations comprised of peaks and valleys in the topographies were different and unique to geomembrane type. As such, the softer and the more flexible the geomembrane liner sheet in an order of HDPE, LLDPE, PVC becomes, the greater the abrasion has developed in that the surface topography demonstrated more severe peaks and valleys. Further, the angular features of sand grains led to the mobilization of more violent abrasive action in that angular particles were able to penetrate into the surface of geomembrane liner, and thus, gouge on a trajectory along the surface. The dimensions and spacing of peaks and valleys for the surface topography were small-scale in relatively stiffer geomembrane liner sheet of HDPE in which the surface topography did not possess sharp corners such that the transitions from peaks to valleys to peaks were smooth and rounded as compared to that of LLDPE as well as PVC geomembranes where sharp and rough transitions from peaks to valleys to peaks exhibited. The quantification of surface topography alterations of different geomembranes by means of the computed values of average roughness Ra determined for the measured surface topographies of the liners unveiled that the Ra i.e. surficial topographical changes increases with an increase in load, relative density, particle angularity of grain shape, and softness of geomembrane liner sheet.

 Surface topography is of importance in playing a major role for the mobilized mechanical behavior, and hence, the strength-stability performance of composite layered systems containing synthetic geomembrane liner and natural granular sand. The 2D surface topography alterations of different geomembranes were experimentally be studied by performing profile relief measurements for detecting and determining 2D surface topographical characteristics of different geomembrane liner sheets produced from distinctive polymeric resins HDPE, LLDPE, PVC previously subjected to abrasive action of granular sand grains at different relative densities Dr and dissimilar particle shape rounded or angular, and additionally at various loading conditions. The surface topographical characteristics as evident on the detected profiles including asperity features such as size, shape, and spacing of material dislocations comprised of peaks and valleys in the topographies were different and unique to geomembrane type. As such, the softer and the more flexible the geomembrane liner sheet in an order of HDPE, LLDPE, PVC becomes, the greater the abrasion has developed in that the surface topography demonstrated more severe peaks and valleys. Further, the angular features of sand grains led to the mobilization of more violent abrasive action in that angular particles were able to penetrate into the surface of geomembrane liner, and thus, gouge on a trajectory along the surface. The dimensions and spacing of peaks and valleys for the surface topography were small-scale in relatively stiffer geomembrane liner sheet of HDPE in which the surface topography did not possess sharp corners such that the transitions from peaks to valleys to peaks were smooth and rounded as compared to that of LLDPE as well as PVC geomembranes where sharp and rough transitions from peaks to valleys to peaks exhibited. The quantification of surface topography alterations of different geomembranes by means of the computed values of average roughness Ra determined for the measured surface topographies of the liners unveiled that the Ra i.e. surficial topographical changes increases with an increase in load, relative density, particle angularity of grain shape, and softness of geomembrane liner sheet.

 Surface topography is of importance in playing a major role for the mobilized mechanical behavior, and hence, the strength-stability performance of composite layered systems containing synthetic geomembrane liner and natural granular sand. The 2D surface topography alterations of different geomembranes were experimentally be studied by performing profile relief measurements for detecting and determining 2D surface topographical characteristics of different geomembrane liner sheets produced from distinctive polymeric resins HDPE, LLDPE, PVC previously subjected to abrasive action of granular sand grains at different relative densities Dr and dissimilar particle shape rounded or angular, and additionally at various loading conditions. The surface topographical characteristics as evident on the detected profiles including asperity features such as size, shape, and spacing of material dislocations comprised of peaks and valleys in the topographies were different and unique to geomembrane type. As such, the softer and the more flexible the geomembrane liner sheet in an order of HDPE, LLDPE, PVC becomes, the greater the abrasion has developed in that the surface topography demonstrated more severe peaks and valleys. Further, the angular features of sand grains led to the mobilization of more violent abrasive action in that angular particles were able to penetrate into the surface of geomembrane liner, and thus, gouge on a trajectory along the surface. The dimensions and spacing of peaks and valleys for the surface topography were small-scale in relatively stiffer geomembrane liner sheet of HDPE in which the surface topography did not possess sharp corners such that the transitions from peaks to valleys to peaks were smooth and rounded as compared to that of LLDPE as well as PVC geomembranes where sharp and rough transitions from peaks to valleys to peaks exhibited. The quantification of surface topography alterations of different geomembranes by means of the computed values of average roughness Ra determined for the measured surface topographies of the liners unveiled that the Ra i.e. surficial topographical changes increases with an increase in load, relative density, particle angularity of grain shape, and softness of geomembrane liner sheet.

 Yüzey topografyası, mobilize edilmiş mekanik davranışta ve dolayısıyla sentetik geomembran astar ve doğal granüler kum içeren kompozit katmanlı sistemlerin mukavemet-stabilite performansında kritik bir rol oynamada önemlidir. Farklı geomembranların, 2 boyutlu yüzey topografisi değişiklikleri, daha önce farklı bağıl yoğunluklarda Dr ve farklı danecik şekillerinde yuvarlak veya köşeli ve ayrıca çeşitli yükleme koşullarında granüler kumun aşındırıcı etkisine maruz bırakılmış değişik polimerik reçinelerden HDPE, LLDPE, PVC üretilen farklı geomembran astar tabakalarının 2 boyutlu yüzey topografyası karakteristik özelliklerini tespit etmek ve belirlemek için profil kabarma ölçümleri gerçekleştirilerek deneysel olarak incelenmiştir. Topografyalardaki tepe ve vadilerden oluşan malzeme dislokasyonlarının boyutu, şekli ve aralıkları gibi pürüzlülük özellikleri de dahil olmak üzere tespit edilen profillerde açıkça görülen yüzey topoğrafik özellikleri farklı ve geomembran tipine özgüdür. Bu nedenle, HDPE, LLDPE, PVC sırasına göre geomembran astar tabakası ne kadar yumuşak ve esnek olursa, yüzey topoğrafyasının daha şiddetli tepeler ve vadiler göstermesi nedeniyle aşınma o kadar fazla gelişir. Ayrıca, kum danelerinin şekilsel özellikleri, köşeli-sivri parçacıkların geomembran astarının yüzeyine nüfuz edebilmesi ve dolayısıyla yüzey boyunca bir yörünge çizebilmesi nedeniyle daha şiddetli aşındırıcı etkinin harekete geçmesine yol açmıştır. Oysa ki, zirvelerden vadilere ve zirvelere keskin ve pürüzlü geçişlerin sergilendiği LLDPE ve PVC geomembranlar ile karşılaştırıldığında, yüzey topografyası için tepe ve çukurların boyutları ve aralıkları nispeten daha sert geomembran HDPE astar tabakasında küçük ölçekliydi; burada yüzey topografyası keskin köşelere sahip değildi, böylece tepelerden vadilere ve tepelere geçişler karşılaştırıldığında pürüzsüz ve yuvarlaktı. Geomembranların ölçülen yüzey topoğrafyaları için belirlenen ortalama pürüzlülüğün Ra hesaplanan değerleri aracılığıyla farklı geomembrane astarların yüzey topoğrafyası değişiminin niceliği, Ranın yani, yüzeysel topografik çeşitliliğin yük, bağıl yoğunluk, dane şeklinin parçacık sivriliği, ve geomembran astar tabakasının yumuşaklığının artışıyla arttığını ortaya çıkardı.

Makale detayları

2D Surface Topography Alterations of Different Geomembrane Liners: Grain Shape, Relative Density and Loading Perspectives

Yazarlar:

Tanay Karademir

Yayıncı:

Osmaniye Korkut Ata Üniversitesi

Ana Başlıklar:

İnşaat Geoteknik Mühendisliği | İnşaat Mühendisliğinde Zemin Mekaniği

Dergi:

Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.7 Issue 5, pp.2346-2363

Belge Tipi:

Makale

Yayın Tarihi:

10/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001326316

pISSN:

2687-3729

2D Surface Topography

Surface Wear

Geomembrane Types

Sand Properties

Grain Shape

Relative Density2B Yüzey Topografyası

Yüzey Aşınması

Geomembran Çeşitleri

Kum Özellikleri

Danecik Şekli

Bağıl Yoğunluk

Sayı

Makale detayları

Yazarlar: Tanay Karademir

Yayıncı: Osmaniye Korkut Ata Üniversitesi

Ana Başlıklar: İnşaat Geoteknik Mühendisliği | İnşaat Mühendisliğinde Zemin Mekaniği

Dergi: Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.7 Issue 5, pp.2346-2363

Belge Tipi: Makale

Yayın Tarihi: 10/2024

Belge Dili: İngilizce

Document ID (Org No.): 2001326316

pISSN: 2687-3729

Sayı

Yazarlar:

Tanay Karademir

Yayıncı:

Osmaniye Korkut Ata Üniversitesi

Ana Başlıklar:

İnşaat Geoteknik Mühendisliği | İnşaat Mühendisliğinde Zemin Mekaniği

Dergi:

Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.7 Issue 5, pp.2346-2363

Belge Tipi:

Makale

Yayın Tarihi:

10/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001326316

pISSN:

2687-3729