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<p>Despite extensive research on rock–concrete interaction and its effect on the performance of different structural elements such as piles, the values of inputs required in numerical analysis are usually assumed especially the interface parameter (<i>R</i><sub>inter</sub>). Rock mass behavior is influenced by its inhomogeneity such that both intact rock properties and the characteristics of rock joints govern this behavior. Therefore, a relationship is needed between pile–rock interaction and the rock mass characteristics. This paper aims at the quantification of this relationship for imbedded piles in rock masses, focusing on the friction around the pile socket. An approach to estimate the <i>R</i><sub>inter</sub> has been developed using a straightforward process based on the rock mass classification parameter, geological strength index (GSI). This approach has been employed to develop a design chart to evaluate the <i>R</i><sub>inter</sub> with the corresponding GSI. The proposed approach has been validated using instrumented pile load tests in the field. This paper provides geomechanics practitioners with a simple process to develop the numerical model of socketed piles in rock masses.</p>

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Incorporating the Rock Mass Properties in the Interface Estimation for Bored Concrete Piles Socketed into Rocks

  • 期刊论文

  • 发表日期：

    2025年3月24日

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  • Doaa A. Tawfik,
  • Mohamed I. Amer,
  • Sherif Akl,
  • Mohamed Ismael

摘要

Despite extensive research on rock–concrete interaction and its effect on the performance of different structural elements such as piles, the values of inputs required in numerical analysis are usually assumed especially the interface parameter (Rinter). Rock mass behavior is influenced by its inhomogeneity such that both intact rock properties and the characteristics of rock joints govern this behavior. Therefore, a relationship is needed between pile–rock interaction and the rock mass characteristics. This paper aims at the quantification of this relationship for imbedded piles in rock masses, focusing on the friction around the pile socket. An approach to estimate the Rinter has been developed using a straightforward process based on the rock mass classification parameter, geological strength index (GSI). This approach has been employed to develop a design chart to evaluate the Rinter with the corresponding GSI. The proposed approach has been validated using instrumented pile load tests in the field. This paper provides geomechanics practitioners with a simple process to develop the numerical model of socketed piles in rock masses.