بررسی تاثیر خصوصیات درزه ها بر روی جریان پایدار آب ورودی به تونل مطالعه موردی: تونل سوم کوهرنگ

Water flow in tunneling projects is one of the main issues that can affect the plan and activity of the tunneling. therefore, it is necessary to predict the location and the amount of water flow into the tunnel. past experience have shown that the accurate prediction of water flow in the excavated tunnels is not possible due to the lack of consideration all influencing factors, especially the properties and condition of joints. in this paper, in order to investigate the effect of joints properties on the water flow rate, the cross sections of koohrang 3 from 1+897 to 1+950 km have been modeled using udec software. by changing the properties of joints, the flow water rate into the tunnel has been assessed. the results of this study have shown that changing the properties of joints has significant influence on the steady state water flow. among these properties, the aperture of joint has the most significant effect on water flow rate in the tunnel.