Estimation of uniaxial compressive strength of North Algeria sedimentary rocks using density, porosity, and Schmidt hard
- PDF / 9,517,894 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 25 Downloads / 272 Views
ARABGU2016
Estimation of uniaxial compressive strength of North Algeria sedimentary rocks using density, porosity, and Schmidt hardness R. Hebib 1,2 & D. Belhai 1 & B. Alloul 1
Received: 29 December 2016 / Accepted: 4 August 2017 / Published online: 30 August 2017 # Saudi Society for Geosciences 2017
Abstract This study aims to establish new correlations to assess uniaxial compressive strength (UCS) of northern Algeria sedimentary rocks. This estimation is based on the measurements of density, porosity, and Schmidt hammer hardness. To achieve this goal, a geological and geotechnical characterization campaign was conducted on 19 types of sandstone and carbonate rocks which have been collected from different geological areas of the Maghrebides chain. Petrographic analyses were conducted to identify the geological characteristics of each kind of rock. Subsequently, physico-mechanical tests (i.e., density, porosity, hardness, and uniaxial compressive strength) were carried out for all the sampled rocks. The results were then used to develop correlations between UCS values and the other parameter values determined. Finally, the UCS predictive equations which have the best predictive powers (coefficient of determination R2 of 0.75 to 0.94) were discussed taking into account the geological specificities of the rocks, and then compared to similar studies developed by other authors in different areas of the world.
This article is part of the Topical Collection on Current Advances in Geology of North Africa * R. Hebib [email protected]
1
Faculty of Earth Sciences and Country Planning, University of Sciences and Technology Houari Boumediene, BP 32 El Alia Bab Ezzouar, 16111 Algiers, Algeria
2
Institute of Architecture and Earth Sciences. Ferhat Abbas Sétif University, El Bez Campus, 19000 Sétif, Algeria
Keywords Petrography . Sandstones . Limestones . Correlations . Prediction . Coefficient of determination
Introduction The uniaxial compressive strength (UCS) of rocks is a key parameter in rock mechanics since it has a significant influence on the quality of rock masses and their behaviors. In some circumstances, such as those related to the excavation of underground structures, the estimation of this parameter to determine the RMR class (Bieniawski 1973, 1989) must be fast and continuous in a way to be adapted to the construction yields and to the need of a fast choice and a fast application of ground support elements. The UCS estimation could be defined from empirical assessments (CEN 2003), but also from indirect estimations using quick and simple geotechnical tests. Thus, several studies have been carried out to establish correlations whose objective is to estimate the uniaxial compressive strength of rocks from simple equations. Deere and Miller (1966); Tuğrul and Zarif (1999, 2000); Shalabi et al. (2007); Diamantis et al. (2009); Binal (2009); Gupta (2009); del Potro and Hürlimann (2009); Andrade and Saraiva (2010); Moomivand (2011); and Sopacı and Akgün (2016) suggested correlations to estimate the uniax
Data Loading...
