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Doygun olmayan siltli zeminlerin sıkışabilirliği

The compressibility of unsaturated silty soils

  1. Tez No: 136445
  2. Yazar: AŞKIN ÖZOCAK
  3. Danışmanlar: PROF. DR. AKIN ÜNALP
  4. Tez Türü: Doktora
  5. Konular: İnşaat Mühendisliği, Civil Engineering
  6. Anahtar Kelimeler: Doygun olmayan zemin, hacim değişimi, sıkışabilirlik, silt, konsolidasyon, zemin-su karakteristik eğrisi, Rowe hücresi, emme kontrollü odometre, basmç plakası, sıkışma yüzeyi. Sakarya Üniversitesi, Fen Bilimleri Enstitüsü, İnşaat Mühendisliği Ana Bilim Dalı, Geoteknik Programı'nda doktora tezi olarak hazırlanan bu araştırmanın amacı
  7. Yıl: 2003
  8. Dil: Türkçe
  9. Üniversite: Sakarya Üniversitesi
  10. Enstitü: Fen Bilimleri Enstitüsü
  11. Ana Bilim Dalı: İnşaat Mühendisliği Ana Bilim Dalı
  12. Bilim Dalı: Geoteknik Bilim Dalı
  13. Sayfa Sayısı: 167

Özet

ÖZET

Özet (Çeviri)

THE COMPRESSIBILITY OF UNSATURATED SILTY SOILS SUMMARY Keywords : Unsaturated soil, volume change, compressibility, silt, oedometer, soil- water characteristic curve, Rowe cell, suction controlled oedometer, pressure plate, volume change surface. This thesis has been prepared in partial fulfilment for the degree of Doctor of Philosophy in the Department of Civil Engineering of the Graduate School of Sakarya University. The aim of the research programme was to investigate the volume change behaviour of the silty soils of Adapazarı under one dimensional loading conditions. Two typical samples of the silty soils of Adapazarı city were selected for this study. They were excavated, air dried and conserved for future use. The physical and the mineralogical properties were determined for the soils which were classified as ML (non plastic) and CI according to the Turkish Standard TS 1500/2000. The samples were reconstituted by mixing with water well above their liquid limit and consolidating them to 200kPa in Ko conditions. Four different tests were performed on the samples: oedometer tests on fully saturated condition; volumetric shrinkage tests; pressure plate and filter paper tests to obtain the soil-water characteristic curve; and suction controlled compression tests in a modified Rowe cell to establish the volume change surfaces. Two approaches were employed in the suction controlled tests to construct the volume change surface. The changes in the void ratio and water content were monitored by increasing the net stress under constant capillary stress, as well as increasing the suction while the net stress was kept constant. The surfaces thus obtained indicate that the surfaces presented in the literature do not reflect the actual behaviour. A rise appears at the ridge line on the volume change surfaces, at 200 kPa matric suction value for silty soil and 300 kPa for clayey soil. This behaviour, which is said to be seen in metastable-structure soils, is thought to be caused collapse features of silts. xv

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