Soil structure changes during compaction of a cohesive soil

Çetin, Hasan; Fener, Mustafa; Söylemez, Mehmet; Günaydın, Osman

doi:10.1016/j.enggeo.2007.03.005

Cited by 36 publications

(15 citation statements)

References 6 publications

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“…While the preferred orientation increased as the moisture content increases, the particles, pores and other elements tend to become parallel with each other. As expected, the long platey particles seemed to be rearrange and reorientate themselves into a new more stable position [15] but when the thermal treatment took place, the bulk density gradually decreased with temperature due to particle size distribution [16]. Eventually, when kaolin is subjected to heating process, particles are found to agglomerate more strongly and lead to have a coarser fraction.…”

Section: Resultsmentioning

confidence: 93%

Modification of Kaolin Mineralogy and Morphology by Heat Treatment and Possibility of Use in Geotechnical Engineering

Muhammad¹

2013

geomate

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This paper presents an experimental work on the effect of heat treatment on the mineralogy and morphology of kaolin. Kaolin, which is moderately expansive, was preheated at temperatures ranging from 200°C to 800°C by increment of 200°C and cooled at room temperature before it was mixed with peat. Peat represents a compressible soil and has low bearing value. The main aim of the work is to study the effect of heat treatment on shear strength parameters of peat-kaolin mixture. The mixtures are prepared at different proportions, and at each proportion triaxial samples were prepared and tested in the undrained condition to study the shear strength parameters. Untreated kaolin-soil mix was also prepared to provide a comparison between the treated and untreated soil mix in terms of the shear strength behaviour. XRD and FESEM were also carried out to investigate the change in soil micro-structure due to heat treatment. The tests showed that there was a slight improvement in the strength of peat-kaolin mixture when kaolin was preheated to a temperature of up to 400°C. Finally results were discussed and conclusions were made for the preheated kaolin-peat mixture.

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Section: Resultsmentioning

confidence: 93%

Modification of Kaolin Mineralogy and Morphology by Heat Treatment and Possibility of Use in Geotechnical Engineering

Muhammad¹

2013

geomate

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“…Zeminlerin ağır enerjilerde sıkıştırılması da kuru birim hacim ağırlıklarının artmasına ve boşlukların azalmasına yol açar. Optimumdan ıslakta ağır enerjide sıkıştırılan zeminlerin tane diziliminin paralel duruma geçmesiyle tanelere dik yönde permeabilitenin azalmasına karşın diğer yönde önemli bir değişiklik olmaz [2][3][4][5].…”

Section: şEkil 1 Sıkıştırılmış Bir Zeminde γK-ω Ilişkisiunclassified

Killi Zeminlerde Permeabilite ve Efektif Gerilmenin Kompaksiyon Enerjisine Bağlı Olarak Değişimi

Pinarci

2017

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖzetBu çalışmada kompaksiyonun önemli parametrelerinden biri olan sıkıştırma enerjisinin farklı oranlarda zemine uygulanması sonucu, zeminin mühendislik özelliklerinden permeabilite ve ön konsolidasyon basıncında (σ ön ) meydana gelen değişiklikler araştırılmıştır. Çalışmada Atatürk Barajı kil çekirdeğinde kullanılan Sam-Tekin ariyet ocağından örselenmiş zemin numuneleri alınmıştır. Killi zemini sınıflamak için kıvam, tane boyu ve özgül ağırlık deneyleri yapılmıştır. Standart Proctor deneyleri yapılarak zeminin farklı kompaksiyon enerjisinde (15, 25, 35, 45 ve 55 vuruşlarda) maksimum kuru birim hacim ağırlıkları ve optimum su içerikleri belirlenmiştir. Belirlenen bu maksimum kuru birim hacim ağırlık ve optimum su içeriği değerlerinde tekrar Standart Proctor deneyleri yapılmış ve konsolidasyon ringlerine numuneler alınarak permeabilite ve konsolidasyon deneyleri yapılmıştır. Sonuç olarak zemine uygulanan kompaksiyon enerjisi arttıkça; zeminin kuru birim hacim ağırlığının arttığı, optimum su içeriğinin azaldığı, ön konsolidasyon basıncının arttığı, boşluk oranın azaldığı ve permeabilitesinin tespit edilmiştir.Anahtar Kelimeler: Kompaksiyon enerjisi, Permeabilite, Efektif gerilme Changes of Permeability and Effective Stress Compacted Clayey Soils Depending on the Compaction Energy AbstractIn this study changes in engineering parameters such as permeability and effective stress due to application of the compaction energy, one of the important parameters of compaction in different proportions have been investigated. Undisturbed clay samples obtained from the Sam-Tekin clay quarry, where the clay core material of the Ataturk Dam was taken, have been used in the study. In order to classify the samples, Atterberg Limits, grain size analysis and spesific gravity tests have been performed. The maximum dry unit weights and optimum moisture contents of compacted samples for 5 different compaction energies (15, 25, 35, 45, 55 blows) have been determined by means of compaction tests. Permeability and consolidation tests have been performed on compaction samples taken from the compacted at the determined dry unit weights and optimum moisture contents. In conclusion, it was determined that as the higher the compaction energy increases, the dry unit weight and preconsolidation pressure increase and the optimum moisture content, void ratio and permeability decrease.

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“…Scanning electron microscopy (SEM) is frequently employed to analyze microstructure of soils in an attempt to assess their environmental and mechanical behavior (Mitchell 1993). Cetin et al (2007) studied the microstructure of a cohesive soil during compaction by SEM test. Shi et al (1999) presented the preparation of soil specimens for SEM test.…”

Section: Introductionmentioning

confidence: 99%

Microstructures of different soil layers caused by the high-rise building group in Shanghai

Cui

Tang

2010

Environ Earth Sci

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The engineering characteristics of soils are controlled by the state of the microstructure of soils to a great extent. With the withdrawal of groundwater controlled reasonably, the engineering-environmental effect of the high-rise building group becomes the main cause of land subsidence in Shanghai. This paper studied the microstructure of each soil layer under the building loads in the centrifuge model by the scanning electron microscopy and the mercury intrusion porosimetry (MIP) for qualitative analysis and quantitative analysis, respectively. The shape, size and contact condition of the basic unit of the soil microstructure were analyzed. The pore structure of each soil layer was studied by MIP, and the pore distribution of each soil layer was studied by the fractal theory. The ink-bottle effect exists in the intrusion stage in the MIP test. There are four different fractal dimensions for silty clay of layer No. 4 and clayey soil of layer No. 8 and three different fractal dimensions for silty sand of layer No. 7 and layer No. 9. The micro and macro mechanisms of land subsidence caused by the high-rise building group were analyzed.

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Soil structure changes during compaction of a cohesive soil

Cited by 36 publications

References 6 publications

Modification of Kaolin Mineralogy and Morphology by Heat Treatment and Possibility of Use in Geotechnical Engineering

Modification of Kaolin Mineralogy and Morphology by Heat Treatment and Possibility of Use in Geotechnical Engineering

Killi Zeminlerde Permeabilite ve Efektif Gerilmenin Kompaksiyon Enerjisine Bağlı Olarak Değişimi

Microstructures of different soil layers caused by the high-rise building group in Shanghai

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