Prediction of Uniaxial Compressive Strength and Modulus of Elasticity for Some Sedimentary Rocks in Kurdistan Region- Iraq using Schmidt Hammer

Uniaxial compressive strength (ucs) and modulus of elasticity or young’s modulus (e) used in most of engineering projects in rock mechanics, are the most important mechanical parameters of rocks. the calculation of these parameters needs most cost, time and effort. there are indirect methods to estimate the (ucs) and (e) such as schmidt hammer, also known as a rebound number (rl), this indirect method is easily and quickly applicable in laboratory and in field and it is considered as a non-destructive method for evaluation of surface hardness. the aim of this paper is to establish a correlation between ucs, e and schmidt hammer rebound value and it has been carried out on forty-nine specimens of different sedimentary rock types that belong to three different formations in kurdistan region, iraq (pila spi formation, fatha formation “lower fars formation” and tanjero formation) with ages (middle-late eocene, middle miocene and campaman-maastrichtian) respectively. the samples were prepared as cuboids of size 5x5x10 cm. a new correlation with high accuracy level for prediction of (ucs) and (e) from schmidt hammer of some sedimentary rocks is proposed for the first time in kurdistan region-iraq.