A fundamental study of the performance of X-section cast-in-place concrete single pilesWang, Yu (Avtor) Lv, Yaru (Avtor) Zhang, Dongdong (Avtor) Zhou, Jieying (Avtor) , Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru (Lastnik avtorskih pravic) X-section cast-in-place concrete pilefield static load testthree-dimensional numerical back-analysisstresstransfer mechanismside resistancesoil archingX-section cast-in-place concrete (XCC) piles are used because they have a higher bearing capacity than circularsection cast-in-place concrete (CCC) piles of the same cross-sectional area. Although the bearing capacity of XCC piles has been studied, the performance of XCC single piles, especially for the stress-transfer mechanism dependent on the geometrical effects, is still not fully understood. This paper reports two comparative field static load tests on an XCC and a CCC single pile of the same cross-sectional area. In addition, corresponding threedimensional numerical back-analyses are performed to provide a fundamental understanding. The measured and computed results reveal that the XCC single pile has an approximately 25% higher ultimate bearing capacity than the CCC single pile. This is because the XCC single pile has an approximately 20% larger total side resistance, which is caused by a 60% larger pile perimeter and a slightly smaller unit side resistance. Lateral soil arching effects are developed, causing a non-uniform effective normal stress and a shear stress across the circumference of the XCC single pile. It is suggested that XCC single piles have a higher efficiency in terms of material saving compared with CCC single piles.20162018-06-15 14:52:30Znanstveno delo70859slFakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru