Shear Modulus and Damping Ratio of Organic Soils |
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Authors: | P Kallioglou Th Tika G Koninis St Papadopoulos K Pitilakis |
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Institution: | (1) Department of Civil Engineering, Laboratory of Soil Mechanics, Foundations’ & Geotechnical Earthquake Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece |
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Abstract: | The paper presents results from a laboratory investigation into the dynamic properties of natural intact and model organic
soils by means of resonant-column tests. The natural intact organic soils were sands, cohesive soils and peats with varying
content of calcium carbonate. The model organic soils were formed in laboratory by mixing kaolinite and paper pulp. The influence
of various soil parameters, such as strain level, confining stress, void ratio, plasticity index, organic content and secondary
consolidation time on shear modulus, G, and damping ratio, DT, is presented and discussed. The test results on natural organic
soils show that only high organic contents (OC ≥ 25%) have significant influence on G and DT at both small and high shear
strains. For the model organic soils, however, a significant influence of even lower values of organic content (5% ≤ OC ≤ 20%)
on G at small strains and DT at both small and high strains is observed. |
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Keywords: | Shear modulus Damping ratio Dynamic properties Resonant-column Organic soils Peat |
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