Behavior of Model Group Piles Subjected to Lateral Soil Movement in Sand

Abstract

Laboratory model tests have been carried out to explore the behavior of piles subjected to lateral soil movement in the sand. The results of a single pile test and ten tests on of group piles arranged in a row (perpendicular to the direction of soil movement) are presented. Different parameters were utilized in these tests, (e.g., pile spacing, number of piles within a group and pile head condition). Group effect was calculated using group factor (F m ) which is defined in terms of the measured maximum bending moments of an individual with the group and that of the single pile. The results showed that the maximum bending moment of group piles decreases from the single pile with decreasing pile spacing and the pile behaves essentially the same as a single pile when the pile spacing is 7d or more. The maximum reduction of the maximum bending moments of about (17%) and (28%) as compared with that for the standard single pile may be observed for a pile spacing of 3d for the free and capped headed condition, respectively. The number of piles does not appear to have a significant effect on the group factor F m of piles, except for the free headed inner piles who's the group factors appear to decrease with increasing the number of piles within a group.

Distribution of the Subgrade Reaction Modulus for Anchor Piles With Various Inclination Angles

“…There have been many horizontal loading experiments and shaking table experiments conducted on pile foundations installed in a soil tank. Conditions for the pile tip include the one in which the tip is fixed to the soil tank [12][13][14][15][16] and the one where the tip is installed in the ground [10,[17][18][19][20]. As an experiment noticing the bearing capacity of a pile, there are cases in which the lower end of a pile is installed in the ground [21].…”

“…The above-discussed experiments [10,18] targeted long piles, but we used a short pile. Most previous studies obtained the bending moment of piles from strain values measured by a strain gauge attached to a pile, from which subgrade reaction was calculated by taking a second derivative [12][13][14][15]17]. One of those studies assessed the depth distribution of subgrade reaction [15], but the strain on a pile was small in depth; thus, the measured value and subgrade reaction calculated from the value are both not quite reliable.…”