Experimental and Numerical Analysis of Axially Loaded Bored Piles Socketed in a Conglomerate Rock Mass

An enhanced micromechanical rock–pile interface model with application to rock‐socketed pile modeling

“…To address this challenge, researchers have proposed ideal simplifications that reduce the complexity of the interface profile while still capturing its essential characteristics. Two commonly used simplified profiles are the uniform sinusoidal surface 15,19,21,25 and the uniform triangular surface. 24,31,36,37 These simplified profiles provide a practical means to approximate the real interface profile and alleviate the measurement burden, facilitating more efficient and accurate analysis of shear behavior.…”

“…In some field tests and model tests involving axial loaded pile, the Styrofoam plug is placed under the pile base to eliminate the toe resistance, thereby enhancing the contribution of the shaft resistance. 7,8,19,52 Furthermore, ineffective base cleaning techniques can result in the presence of debris below the pile toe, significantly reducing the pile base stiffness and leading to increased mobilization of the shaft resistance. 2,19 Consequently, the pile-socket model with a Styrofoam plug or debris is constructed as the primary emphasis of this research.…”

“…The numerical and analytical methods such as finite element method (FEM), 15,[17][18][19][20][21][22] the finite difference method (FDM), 23 the distinct element method (DEM), 24,25 the load transfer method, 4,10,26 and other methods 27 have been widely used in simulating the axially loaded rock-socketed pile with the rapid advancement of computer technology. In particular, the FEM has been widely utilized to replicate key aspects of rock-socketed piles, such as their load-settlement behavior and the mobilized shear resistance at pile-rock interface.…”

“…Furthermore, different modeling techniques for the pile-rock interface have been reported in literature. Hassan and O'Neill, 21 Gutiérrez-Ch et al, 25 and Skejić et al 19 built numerical models of the pile-rock with idealized sinusoidal explicit socket roughness interface and investigated the effect of socket roughness on shaft resistance. Representative interface parameters were back-calculated from field-measured roughness data to ensure proper prediction of the pile shaft bearing capacity.…”

Modification of bearing capacity of rock-socketed pile: considering concrete-rock interface roughness and gravity stress of concrete

“…Zhou et al [39] analyzed the law of the influence of bond strength on the friction resistance of rock-socked piles, and the results showed that the influence of bond strength on the ultimate bearing capacity of pile could not be ignored. Some scholars have proposed a cementation softening load transfer model based on the shear mechanical characteristics of the concrete-rock interface, and it is indicated that the cementation softening model is more suitable for load transfer calculation of piles with large rocksocketed proportion or completely rock-socketed pile by settlement prediction [7,11,29,38,41]. The damage effect of the roughness of the concrete-rock interface has been ignored in previous studies.…”