Abstract
Ultimate pile capacity determination is crucial before the structure construction. This essential pile resistance can be accurately predicted and studied using the finite element method. FEM is a numerical method that is anticipated to be indispensable in advances in pile analyses, aiming at pile effectiveness and material efficiency. Pile modeling is attainable using FEM for the stability investigation concerning the geotechnical findings. In addition, several constitutive mathematical models have been available for FEM applications to reasonably simulate soil behavior under pressure. This study conducts numerical modeling of eight bored piles of different diameters and lengths embedded in silty-sand soils. Using the FEM software ABAQUS, pile load-settlement curves are obtained to determine ultimate pile capacity, skin friction resistance, and pile base resistance. The modified Drucker Prager Cap model is used as a constitutive soil model for silty sand soils. In applying the MDPC model, the cap hardening behavior (hardening parameter) is obtained by having the site soils compression and swelling indices determined using the proposed regression equations in the literature. Piles were modeled successfully, and the results positively correlate with the results of the dynamic analysis test conducted in Davao del Norte, Philippines.
Highlights
The high demand for constructing essential structures in soft-soil conditions has resulted in efficient pile foundation construction
Results for Qu, Qs, and Qb were compared with the pile dynamic analysis test (PDA) test results
The analyses show that the maximum strain in the hardening curve models was sufficient to allow the pile to settle at 0.10D mm for gathering a pile-load settlement curve
Summary
The high demand for constructing essential structures in soft-soil conditions has resulted in efficient pile foundation construction. This pursuit causes the rise of analytical methods to predict ultimate pile capacity [1]. In a typical pile-load-settlement curve, the ultimate load of the pile occurs at settlement equals ten percent of its width or diameter. Another way of determining the ultimate load from the load settlement curve is by drawing two tangent lines and a vertical line intersecting the tangent lines' intersection. The magnitude of the load intersecting the vertical line is the ultimate capacity [2]
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