Abstract

The main purpose of this study was to carry out the physical and mechanical characterization of dolomitic limestone from "Camadas de Coimbra" Formation with different degrees of weathering. The study begins with a characterization of the geotechnical properties of the intact stones used in this research. Seven tests (sound velocity, porosity, density, uniaxial compressive strength, point load strength, Schmidt rebound hardness and slake-durability) were carried out. The characterization permitted to understand and evaluate the variation of the mechanical and physical properties throughout the weathering processes. The porosity tends to growth according to the rock weathering degree. Its increase corresponds to a decrease of the ultrasonic velocity and rock density. Considering the totality of the specimens tested, moderate correlation coefficient was found between the longitudinal waves propagation and the point load strength values (r = 0.62). For the longitudinal and transversal waves propagation the correlation coefficient was equal to 0.75.

1 Introduction

The main purpose of this work is to contribute to the geotechnical knowledge of several weathering degrees of dolomitic limestone belonging to the "Camadas de Coimbra" Formation. The characterisation of the physical and mechanical properties was carried out.

The study area is located in the city of Coimbra (Central Portugal). Log samples were collected in a prospection campaign performed at Polo I of the University of Coimbra. The rock characterisation was carried out through seven laboratory tests: sound velocity, porosity, density, uniaxial compressive strength, point load strength, Schmidt rebound hardness and slake-durability tests.

Correlations were established based on the test results, in order to define and predict the geotechnical behaviour of dolomitic limestone with different degrees of weathering.

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