STUDY OF THE SHEAR STRENGTH OF CLAYSTONES AGAINST CONSTANT TRANSFER RATE RATINGS
Rock shear strength is an important parameter of rock mass characteristics which among other things can be determined by direct shear tests. Direct shear tests with a certain rate rating are almost never performed on claystone. The International Society for Rock Mechanics provides standards for horizontal displacement rates from 0.1 – 0.5 mm/min. Because the shear parameters in planning the activities of an open pit mine are very important, it is necessary to carry out a direct shear test. The test was carried out on an original sample of claystone with a cylindrical shape of 54 mm in diameter and 70 mm in height. The results obtained show that for the rate range of 0.1 mm/min to 0.5 mm/min the relationship between speed and shear strength is very significant (R2 > 0.5) so that it can be said that a certain rate rating affects the shear strength and shear parameters. While for the rate range of 0.5 mm/min to 1.5 mm/min there is no effect of displacement rate on shear strength and shear parameters. Evidenced by the statistical test Fcount
Shear parameter, Constant Rate, Direct Slide