Numerical Study of Skin Friction Behavior of Piles in Limestone Rock

Alnuaim, Ahmed; Hamid, Wagdi; Alshenawy, Abdulhafiz O.

doi:10.1007/s11204-020-09664-1

Cited by 4 publications

(1 citation statement)

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“…Leong and Randolph used finite element analysis to study the response of the pile body, with particular attention to the shaft response with and without intimate base contact [20]. Alnuaim et al took a friction pile as the research object and studied the characteristics of side friction resistance under vertical load until failure [21]. Seol et al analyzed the coupling effect of soil resistance in the rock-socketed shaft by the elastic-plastic finite element method and studied the slip and shear load transfer characteristics of the pile-soil interface [22].…”

Section: Introductionmentioning

confidence: 99%

Side Friction of Rock‐Socketed Piles Involving Thick Sediment

Wang

Zhang

Hao

et al. 2020

Advances in Civil Engineering

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This paper investigates the skin friction transfer characteristics of the rock-socketed section of a rock-socketed pile resting on thick sediment by conducting in situ core-drilling tests and static loading tests. Test results show that when using the impact hole-forming method in weakly cemented soil, a layer of sediment is deposited at the pile bottom. Due to the existence of sediment, when the load reaches a certain value, sudden and large subsidence is observed. This indicates that the end resistance does not contribute to the bearing capacity. Thus, it is not appropriate to consider both end resistance and side resistance in the existing design method of a rock-socketed pile. The bearing capacity of a single rock-socketed pile should be determined according to the side resistance of the soil layer and rock-socketed section only. Numerical analysis is performed to determine the deformation and load-carrying capacity of the pile and the distribution of friction on the sides of the rock-socketed segment. Under a given applied load, small settlement is observed when socketed thickness and rock strength are relatively large. The distribution of side friction of the socketed segment along the vertical direction shows a double-peak saddle shape. When the socketed thickness and rock strength are relatively smaller, the lower peak is higher than the upper peak, and conversely, when the socketed thickness and rock strength are relatively larger, the lower peak is smaller than the upper peak. For a given applied load on the pile top, smaller socketed thickness results in larger settlement and side friction. Due to the thick layer of sediment, the axial force of the rock-socketed segment of the pile gradually decreases along the vertical direction from the applied load on the pile top to zero at the bottom. According to the mechanical properties at different shear stages, a function is derived for the complete constitutive model for a pile-rock interface. Analytical solutions for the friction of a single pile are obtained under the conditions of failure and elasticity deformation of the surrounding rock. Its load transfer equation is derived as well. Accordingly, an equation is proposed for calculating the bearing capacity of rock-socketed piles resting on sediment at the bottom.

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Section: Introductionmentioning

confidence: 99%