Conference proceeding
Drilled Shaft Load Tests to Investigate Side Friction Development along Drilled Shafts in Very Weak Porous Limestone
GEO-CONGRESS 2024: FOUNDATIONS, RETAINING STRUCTURES, GEOSYNTHETICS, AND UNDERGROUND ENGINEERING, Vol.350
Geotechnical Special Publication
01 Jan 2024
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
This paper presents the results of two load tests on instrumented drilled shafts in very weak limestone performed to investigate the ultimate side friction that can be developed in this type of rock. The test site is located in NW Puerto Rico and involved a very weak porous limestone with a representative unconfined compressive strength of 2.7 MPa, and an average rock quality designation (RQD) of 34%, corresponding to a highly weathered state. The paper also evaluated the predictive performance of 10 commonly used empirical correlations of the maximum unit side friction based on the unconfined compressive strength. The range of the predictions of the ultimate side friction was found to be very large, highlighting the importance of improving our capability of predicting this parameter for design purposes. Furthermore, the measured ultimate side friction values were found to be above the upper bound of the range of predicted values using the selected static methods. The higher measured values are attributed to the medium to high surface roughness of the rock socket walls. The authors recommend the development of improved correlations that incorporate important design aspects such as rock socket roughness and stiffness ratios of the surrounding rock and drilled shaft.
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Details
- Title
- Drilled Shaft Load Tests to Investigate Side Friction Development along Drilled Shafts in Very Weak Porous Limestone
- Creators
- Jose R. Ramirez - WSP Inc, Mayaguez, PR USAMatias R. Frediani - Drexel Univ, Dept Civil Architectural & Environm Engn, Philadelphia, PA 19104 USAMiguel A. Pando - Drexel Univ, Dept Civil Architectural & Environm Engn, Philadelphia, PA 19104 USA
- Contributors
- T M Evans (Editor)N Stark (Editor)S Chang (Editor)
- Publication Details
- GEO-CONGRESS 2024: FOUNDATIONS, RETAINING STRUCTURES, GEOSYNTHETICS, AND UNDERGROUND ENGINEERING, Vol.350
- Series
- Geotechnical Special Publication
- Publisher
- Amer Soc Civil Engineers
- Number of pages
- 10
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Civil, Architectural, and Environmental Engineering
- Identifiers
- 991021866513904721
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- Web of Science research areas
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- Engineering, Geological
- Geochemistry & Geophysics