Point-load strength (Is) as a measure for the determination of rock strength and for estimating uniaxial (unconfined) compressive strength (UCS) are described and both put together and used for rock strength classification of brittle and hard rocks. Although the RQD classification is a simple and relatively inexpensive method of determining the quality of rock masses, however, it is not sufficient for an adequate description of the rock mass. classification system for the stability of rock masses. Subsurface soil or rock properties are generally determined using one or more of the It is important to understand the limitations of rock mass classification schemes (Palmstrom and Broch, 2006) and that their use does not (and cannot) replace some of the more elaborate design procedures. On the other hand, over-consolidated clays or weak rock may lose strength with time when exposed in cuts. On the other hand, in situ strength testing of the rock mass is seldom practically or economically feasible. provide estimates of the strength and deformation properties of the rock mass. Methods of Determining Soil and Rock Properties. Rock materials are generally classified based on their strength values, especially from uniaxial compressive strength (Singh and Goel, 2011).However, the lithology of the material is the dominant factor in the material’s strength, so classification depends on the quantification rather than the qualification of the material. Mechanical Properties 2. These classes are (1) igneous rocks… However, the use of these design procedures requires 5 .4. Ozturk and Nasuf (2013) demonstrate a simple application of strength classification of rock materials based on rock texture that also used some the data from this study. Rock, in geology, naturally occurring and coherent aggregate of one or more minerals. Rocks are commonly divided into three major classes according to the processes that resulted in their formation. Heavily jointed or broken rock in which the tensile strength, cohesive strength, and effective normal stress are zero is char­ acterized by a minimums-value of zero. The estimated point-load strength values of specimens of varying sizes and also the values corrected to a standard … Such aggregates constitute the basic unit of which the solid Earth is composed and typically form recognizable and mappable volumes. Laboratory tests on core samples are not representative of a rock mass of significantly larger volume. The main requirement of a classification to estimate rock mass strength parameters, then, is a close correspondence between the parameters included in the classification and the construction materials such as weak rock may lose strength due to weathering within the design life of the embankment. 2)Stand-up time classification 3)Rock Quality Designation (RQD) 4) Rock Structure Rating (RSR) 5) Rock Mass Rating System (RMR) 6) Q-System 7) CSIR classification of jointed rock mass Introduction •Intact rock •Stratified rock •Moderately jointed rock •Blocky and seamy rock •Crushed •Squeezing rock •Swelling rock 1. The geotechnical engineer is responsible This method of rock classification was introduced by Deer & Miller in the year 1996. Classification of intact rock based on UCS Strength (MPa) 6. These long-term effects shall be considered when selecting properties to use for design. 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