Abstarct: The resistence parameters of the rock mass are among the most important information needed for designing and for checking the stability of the structures which will be buried in the stone. Determining the right amounts and having the insurance level of the The resistence parameters of the rock mass is very important in designing issues and in stability of structures buried in the stone such as tunnels . One of the most important reinforcing systems in the surface and underground of the stone structures is the rock bolts and among them the fully grouted rock bolts have a special place ; due to their length of involvement and the grout used in them. because of the interaction's complexity between the rock bolts and the joints, The evaluation of the resistance behavior of the reinforcing connected rock masses(joints) and the rock bolts is a very challenging thing to do. One of the important things in surveying the reinforcing connected rocks with the rock bolts is the way the rock bolts are considered in the increase of the rock mass' resistance. because the effect of rock bolts in restriction of relative movement in length of the joints is not considered in the numerical method, this method is not suitable. For surveying the reinforcing effects of the rock bolts, the connected rock mass should be modeled as a continues equivalent area and the continuous equivalent mechanical parameters must be be evaluated, considering the reinforcing effects of the rock bolts . In this survey, the information and data from the Alborz tunnel is used for checking the effect of fully grouted rock bolts on the resistance parameters of the rock mass. With the help of analytical method and two solutions which are 1. using the rock bolts' density parameter (β) and 2. using the additional confining pressure (∆σ_3), the effects of the rock bolts on the resistance parameters of the rock mass has been checked. The result of both shows that the existence of the rock bolts increases the resistance parameters of the rock mass. With the increase of adhesion parameters, s and m_b, the effect of the rock bolts increases in both methods and with increasing the internal friction angle in both methods and modules increase of deformability of the rock mass, the effect of the rock bolts will decrease. The size of the increase in every resistance parameters of the rock mass is more in the density of the rock bolts' method than in the additional confining pressure method. Also in this method (rock bolts' density parameter), the effects of the diameter and distance on the resistance parameters of the rock mass is checked. And it was observed that with the increase of the diameter and decrease of the rock bolts' distance, the rock bolts' density parameter increases and with this increase, the resistance parameters of the rock mass will increase too. In numerical method two modeling like rock bolts' modeling (common modeling) and equivalent modeling around the tunnel has been done (due to the existence of the rock bolts). In the equivalent modeling, the movements of the crest, of the right and left walls of the tunnel has decreased respectively 13, 57, 51 percent. Also the plastic zone around the tunnel is decreased in equivalent modeling in comparison to the rock bolts' modeling. At last it was observed that with calculations of reinforcing effects of the rock mass in analytical way and considering the effects of the rock bolts as the reinforcing part around the tunnel in numerical method, numerical modeling showed more exact results comparing to the common rock bolts' modeling.