Geotechnical performance of XCC pile under torsion loads in clay soil – Numerical study
Résumé
Abstract A series of three–dimensional finite – element models (PLAXIS 3D V20) were developed to investigate the non-linear behavior of XCC section piles under torsional load in clay soil with various soil cohesion states. Piles were assumed to behave in a linear elastic model, while the soil was modeled using the non-linear (HSM) hardening soil model. The influence of pile length to pile diameter ratio (Lp/Dp), 0pen arc spacing to pile diameter ratio (ap/Dp), and open arc degrees(θ˚) were explored. the numerical results showed that the torsional capacity of the pile increases with the increase of clay cohesion. At the ratio of pile length to pile diameter (Lp/Dp) = 15, and the ratio of the open arc spacing to pile diameter (ap/Dp) = 0.14, open arc degrees(θ˚) = 90 the efficiency of improvement in the torsional capacity reached to 3.96, 5.06, and 5.71 times of torsional capacity of conventional pile with the same cross-sectional area at clay cohesions of 70 KN/m2, 40 KN/m2, and 30 KN/m2, respectively. furthermore, the torsional capacity of the XCC section pile increases with the increase in soil cohesion (Cu), pile diameter (Dp), pile length (Lp), and open arc spacing. but it decreases with the increase of open arc degrees(θ˚). The change of shape to XCC shape can significantly increase the earth pressure and skin friction around the pile by creating a passive zone, and increasing the perimeter.
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