Ultimate Capacity of Battered Pile Groups Subjected to Oblique Pullout Loads in Sand

A testing program comprising 250 oblique pullout tests was conducted to study the effect of variable parameter on pullout capacity of batter pile groups in sand. Test was conducted in laboratory on five pile groups. Model piles consist of aluminium having three length 0.40, 0.60, 0.90 m at two unit weights 16.28 and 15.79 kN/m³. Two pile surfaces were tested and angle of oblique load was kept at 0°, 10°, 20°, 30°,45º. Analysis of results indicates that increasing value of pile length, sand unit weight, and surface roughness increases the the pullout capacity of oblique piles. Increasing angle of oblique load from horizontal also increases the oblique pullout capacity for batter pile group but have no significant difference at lower angle of oblique load. Difference in oblique load caring capacity for each pile length, unit weight and surface roughness became significant at higher angle of oblique load. ANOVA single factor test indicate except pile surface other parameter viz length, unit weight and angle of oblique load significantly affect oblique load caring capacity.