IMPROVEMENT OF SHEAR STRENGTH PARAMETERS OF MODEL ORGANIC SOILS

Hameed Majeed, Adel; Shakir Al-Soud, Madhat; Hadi Sadiq, Zainab

	IMPROVEMENT OF SHEAR STRENGTH PARAMETERS OF MODEL ORGANIC SOILS
Journal of Engineering and Sustainable Development
Article 1, Volume 20, Issue 5, 2016, Pages 213-224
Authors
Adel Hameed Majeed; Madhat Shakir Al-Soud; Zainab Hadi Sadiq
Abstract
The characteristics of organic soil are low permeability, low shear strength and high compressibility, therefore organic soil has to be improved before any engineering works can commence. In this study dry kaolinite is used as a clay minerals and fresh reed as an organic material for different percentages (0%, 2%, 5%, 8%, 12% and 20%) by dry weight. Lime is used as a treatment material for different percentages (0%, 3%, 6% and 9%) by dry weight. The experimental work includes a series of compaction and direct shear tests conducted on 48 samples. The effect of addition of lime on shear strength parameters of non-decomposed and decomposed model organic soil was studied. The results showed that the cohesion values (c) increase with increasing organic content up to 5% for non-decomposed samples and up to 7.0% for decomposed samples while angle of internal friction (φ) increases with the increase in organic content for both decomposed and non-decomposed samples. Also use of lime has increased the angle of internal friction of soil especially when used within the range of (0-3) % lime content.
Keywords
organic content; Shear Strength; cohesion; angle of internal friction; Lime

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