Influence of sample size on the degree of saturation and equilibrium of pore pressure
Başlık çevirisi mevcut değil.
- Tez No: 403205
- Danışmanlar: Dr. AIKATERINI TSİAMPOUSI, Dr. LIDIJA ZDRAVKOVIC
- Tez Türü: Yüksek Lisans
- Konular: Çevre Mühendisliği, İnşaat Mühendisliği, Environmental Engineering, Civil Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2012
- Dil: İngilizce
- Üniversite: Imperial College London
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 121
Özet
Özet yok.
Özet (Çeviri)
Soil Water Retention Curve (SWRC) is very essential to investigate the complex engineering behaviour of unsaturated soils. The determination of SWRC can be carried out by several ways. However, the filter paper method is the most widely used one in the experimental studies. Although it is commonly employed in the laboratory studies, there is no much attention on the influence of the sample size on the measurement of degree of saturation and equilibration time. Therefore, this study aims at investigating the effect of sample size on the measurement of degree of saturation and the equilibrium time for four different sizes of soils. Moreover, this study aims to provide some accurate guidelines for the measurement of SWRC with filter paper technique. These goals are achieved by first involving in an experimental filter technique application on two particular selected expansive clays, then by performing some numerical analyses. First a laboratory experiment with filter paper technique is observed to correctly simulate the experimental boundary conditions, pore pressures in the numerical studies. This test has provided the relevant SWRC data to use in the numerical studies. In the numerical part of this study, some numerical simulations on the experimental data are carried out on four different sizes of samples. These numerical analyses are performed on Imperial College Finite Element Program (ICFEP). In the numerical studies, the laboratory properties such as boundary conditions are tried to simulate as much accurate as. After defining the boundary conditions and adopting the experimental material properties to ICFEP, several analyses are employed. The case studies in ICFEP are classified in terms of soils` drying, wetting; permeability characteristics. The results of numerical studies have shown that there is a considerable effect of suction level on the equilibrium time. The equilibration of pore pressure within the soil becomes difficult after some value of suction is exceeded. However, the numerical studies have not provided a direct correlation between the sample size and equilibration time, and a correlation between the degree of saturation and sample size due to the limited experimental data and the uncontrolled suction application in the laboratory. Considering both positive and negative outcomes of this study, a preliminary decision that can be made is that the equilibration time is significantly affected by the suction level, and this result is a useful guideline for the accurate measurement of SWRC in the next stages of experimental studies.
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