Ramírez-Hernández, José R.

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    Axial compression load transfer mechanisms of drilled shafts in weak porous limestone
    (2012) Ramírez-Hernández, José R.; Pando-López, Miguel A.; College of Engineering; Ramos Cabeza, Ricardo; Wendichansky, Daniel; Department of Civil Engineering; Serrano, Guillermo
    The considerable increase in the use of drilled shafts to meet the demand of loads of great magnitude in the construction of buildings, roads and bridges, the fact that around 27.5% of the geomorphologic area of Puerto Rico is conformed for karstic areas, and the uncertainty generated by using the correlations proposed to date, based on research of rock formations of limestone from other countries, has encouraged performing a more detailed study on the mechanisms of transfer of loads between the concrete shaft and highly weathered limestone of Puerto Rico. A compression load testing program was undertaken to optimize the design of the deep foundations by determining the unit shear resistance being developed along the length of the test drilled shafts within the highly weathered and porous limestone from Aymamón formation. This program consisted of two axial compressive load tests on strain gauge instrumented drilled shafts. The primary relationship of the charge transfer resistance is based on the unconfined compression strength of the rock. The study also includes other laboratory tests to better characterize the rock and contribute to future research. The load test provides a basis for a load transfer criterion and evaluates experimentally the characteristics of the unit side resistance of drilled shafts in highly weathered rock of Puerto Rico.