Compression Index Prediction Models for Fine-grained Soil Deposits in Nigeria

Abstract

Compression index prediction models for fine-grained soil deposits in Nigeria are presented. Correlation model equations, each for compression index, in terms of initial void ratio, product of initial void ratio and specific gravity, product of liquid limit and initial void ratio, quotient of percentage fine content and specific gravity, natural moisture content and liquid limit were considered using regression analysis. Values of coefficient of determination (R2) of the correlation models were used to evaluate the resulting models. The correlation models expressing compression index (cc) in term of initial void ratio (e0) and as a function of the product of specific gravity and initial void ratio gave R2 value of 73.5 and 70.1% respectively. The model expressing cc as a function of the product of liquid limit and initial void ratio has R2 value of 53.6%, while that as a function of the quotient of percentage fine content and specific gravity gave R2 value of 51.3%. Weak correlations exist between compression index and natural moisture content, and between compression index and liquid limit for fine-grained soil deposits in Nigeria.