en STRENGTH REDUCTION TECHNIQUE IN STABILITY ANALYSIS OF JOINTED ROCK SLOPES Research Paper Research Paper Existence of discontinuities causes higher deformability and lower strength in rock masses. Thus joints can change the rock mass behaviour due to the applied loads. For this reason properties and orientation of the joint sets have a great effect on the stability of rock slopes. In this paper, after introducing some numerical methods for evaluating the factor of safety for the stability of slopes, stability of jointed rock slopes in the plane strain condition is investigated with the strength reduction technique this method is modified and applied in the multilaminate framework. First of all, stability of one homogeneous rock slope is investigated and compared with the limit equilibrium method. Then stability of a layered rock slope is analyzed with some modifications in the strength reduction technique. Effects of orientation, tensile strength and dilation of layered joint sets on the factor of safety and location of the sliding block are explained. JOINTED ROCK MASS, MULTILAMINATE MODEL, NUMERICAL METHOD, SLOPE STABILITY, STRENGTH REDUCTION TECHNIQUE 152 165 http://ijce.iust.ac.ir/browse.php?a_code=A-10-343-4&slc_lang=en&sid=1 MAHIN ROOSTA R. 180031947532846005831 180031947532846005831 Yes SADAGHYANI M.H. 180031947532846005832 180031947532846005832 No PAK A. 180031947532846005833 180031947532846005833 No