Numerical Analysis of Inclined Granular Pile Anchor Subjected to Uplift Forces in Expansive Soil using Abaqus

Granular pile anchor is a new technique that is commonly used to improve the pull-out resistance of expansive soil like soft clay, loose sand, and black cotton soil. Using the Abaqus software, this work presents a numerical investigation to estimate the pull-out capacity of granular pile anchor in soft clay. By applying a specified displacement of ۱۰% of D (pile diameter) on the granular pile anchor, the effects of length, diameter, angle of inclination (α), and number of GPA at varying spacing values on uplift capacity is examined. Additionally, L/D ratios of both individual and group piles are examined using various variables. The study uses expansive soil and GPA of unit weight ۱۷ kN/m۳ and ۲۲ kN/m۳, poisson’s ratio of ۰.۴ and ۰.۳, modulus of elasticity ۴ MPa, and ۱۱ MPa, respectively, for the estimation of uplift capacity. The cohesion value for the expansive clay is ۲۵ kPa, and the angle of shearing resistance for GPA is ۳۶˚. According to the numerical study, both for a single pile and for piles placed in a group, with increases in pile length and diameter, the granular pile anchor's pull-out capability improves. For a pile placed in group the value of the pull-out capacity shows optimum result when spacing (S) is ۲.۵D. Additionally, the uplift capacity of the granular pile anchor increases with an increase in angle inclination (α) from ۰˚ to ۱۰˚, and then decreases from ۱۰˚ to ۱۵˚. The efficiency of GPA is examined, which assists in the choice of the different granular pile anchor parameters.

کلیدواژه ها:

Granular pile anchor ، Pullout resistance ، Expansive soil ، Upward displacement ، Uplift capacity