Abstract
In United Arab Emirates (UAE) and the Arabian Peninsula, most of the rocks are sedimentary in nature and mainly consist of sandstone, mudstone and crystalline gypsum. The identification of rock properties is beneficial for the construction work and design projects. Unconfined compressive strength (UCS) is the most frequently used method and is usually determined from laboratory tests, among the different strength parameters. A study was undertaken to assess estimating strength parameters from empirical correlations of such rocks and to develop the governing predictive equations. In order to conduct this study, 420 soil samples were collected from various locations in the UAE and were tested for various observations including point load test (Is(50)) and ultrasonic velocity (USV) through its pulse velocity. The results indicated that the nomographs could predict well the unconfined compressive strength within ± 10% confidence interval for both Is(50) and USV. The accumulating experience over many years of rock testing in our laboratories and other geotechnical investigation laboratories in the area suggested that there exists an underlying trend that governs the strength characteristics of such rocks.
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