Publication Abstract

Proceeding of the 2018 DFI-EFFC International Conference on Deep Foundations and Ground Improvement, Rome, Italy, (DFI, EFFC)

Estimation of the Load Bearing Capacity of Root Piles Partially Embedded in Rock Mass Rhyolite, Using Empirical and Semi-Empirical Methods
Myckelle M. S. Ferreira, Engineer and Roberto Q. Coutinho, Teacher

Due to the different geotechnical conditions associated with the construction of PetroquimicaSuape, Pernambuco / Brazil, it was necessary to use root piles partially embedded in a rock mass. Through the research campaign, after the soil layer, a rock mass was found, consisting of stretches of rhyolite, basalt and intermediate material between rhyolite and trachyte. In general, the rock mass was occasionally extremely weathered with compressive strength ranging from 30 MPa . qu .110 MPa. With the results of three static load tests, it was possible to compare the failure load obtained by interpreting the load-settlement curves, with the bearing capacity obtained by applying the methods of Horvath (1978), Poulos and Davis (1980), Rowe and Armitage (1984), Cabral and Antunes (2000) and Espana (2011), including the consideration of lateral strength of the soil section. The bearing capacity obtained by the soil contribution and application of the Horvath method (1978) to lateral rock bedding provided good estimates of the failure load, with a difference of -24% to +25%. By considering the lateral inlay and base of the pile in rock mass, using the method of Espana (2011), plus the contribution of the soil, this difference is between -30,5% and -8%.

 article #3011; publication #1040 (ROME-2018)