SHALLOW INTRODUCTION FOUNDATIONS
s: earth pressure coefficient δ: soil-pile friction angle 20 0.36 Dense sand 1 o Loose sand 0.5 20o 0.18 Steel piles Dense sand 2 3/4Φ' 0.68 1.15 Loose sand 1 3/4Φ' 0.34 0.58 Concrete piles Φ'=25o Φ'=40o βs=Ks.tanδ Ks δ Empirical values for φ, K s and δbased on pile material types;
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