Abstarct: Awareness of uniaxial compressive strength (UCS) and deformability values of jointed rock masses are inevitable parts of geomechanics-related concerns. However, Laboratory tests can not be helpful to capture the behavior of large-scaled rock masses. Deformability of a rock mass with stochastic joint sets is potentially anisotropic and is mainly governed by joints mechanical and geometrical characteristics. In situ tests are often conducted to determine the deformability properties of a rock mass. Numerical and analytical methods also can be used, alternatively. The available models for the deformation analysis of rock masses can be divided into two general categories: continuum models and discontinuum models. In discontinuum models, the joints are simulated explicitly. However, when the number of joints in a model increases, the explicit definition of all joints becomes difficult and, in some cases, impractical. Besides, due to the dependency of numerical discretization on joint spacing and orientation, the size of a discontinuum model increases considerably as the number of joints increases within the model. The constitutive equivalent continuum relations can be used as a rule of thumb which is an alternative to discontinuum models for the deformation analysis of jointed rocks. In this thesis, strength and deformation behavior of jointed rock masses is evaluated. Field surveys through scanline method are used to collect sandstone joints spatial features on the rock surface at Tazareh coal mine. A statistical evaluation is conducted on field data using Dips software. A rock mass containing two networks of discrete joints is modelled using 3DEC, and its behavior is analyzed in some cases with different loading directions and block sizes to obtain Representative Elementary Volume (REV) in Tazareh mine. Empirical values of UCS and deformability modulus are compared with values obtained by discrete modelling and proficiency of the empirical solutions is investigated.