Journal of Applied Mathematics and Physics, 2014, 2, 296-303

Published Online May 2014 in SciRes. http://www.scirp.org/journal/jamp

http://dx.doi.org/10.4236/jamp.2014.26035

How to cite this paper: Salah, H., Omar, M. and Shanableh, A. (2014) Estimating Unconfined Compressive Strength of Se-

dimentary Rocks in United Arab Emirates from Point Load Strength Index. Journal of Applied Mathematics and Physics, 2,

296-303. http://dx.doi.org/10.4236/jamp.2014.26035

Estimating Unconfined Compressive

Strength of Sedimentary Rocks in United

Arab Emirates from Point Load Strength

Index

Hussain Salah, Maher Omar, Abdallah Shanableh

Department of Civil and Environmental Engineering, University of Sharjah, Sharjah, UAE

Email: hqasem@sharjah.ac.ae, momar@sharjah.ac.ae, shanableh@sharjah.ac.ae

Received February 2014

Abstract

In this paper, three rock types including Sandstone, Mudstone, and Crystalline Gypsum were part

of a laboratory study conducted to develop a dataset for predicting the unconfined compressive

strength of UAE intact sedimentary rock specimens. Four hundred nineteen rock samples from

various areas along the coastal region of the UAE were collected and tested for the development of

this dataset and evaluation of models. From the statistical analysis of the data, regression equa-

tions were established among rock parameters and correlations were expressed and compared by

the ones proposed in literature.

Keywords

Sedimentary Rocks, United Arab Emirates, Unconfined Compressive Strength, Point Load Strength

Index, Regression Analysis

1. Introduction

A closer look at the development projects and construction boom that occurred in the last decade in the United

Arab Emirates (UAE) gives thoughtful considerations about the construction of such major projects. In every

construction project, geotechnical investigations are carried out to determine how the components of the project

that interact with the soil and rock should proceed. Geotechnical investigations vary in complexity and prices;

some of them require days of sophisticated work, complex procedures to be followed and fortunes of money to

be spent. Therefore, geotechnical engineers thought about devising easier, less sophisticated and cheaper ways

to estimate results of some important geotechnical parameters. Estimation of such parameters is also needed to

overcome sampling and handling problems. Estimation of parameters is typically done through generating em-

pirical correlations that simplify estimation of the values of parameters with considerations to safety and effi-

ciency.

One of the most important rock parameters is the unconfined compressive strength (UCS). It is used widely in