In this paper, a crushed zone in a tunnel on Asmari Formation has been studied using 2d geolectrical method. Two different arrays have been merged to obtain more suitable result along the tunnel. Based on result, a fault has been recognized as the main reason of such crushed zone and Prediction of width of the crushed zone has been proved after excavation. In this paper, a crushed zone in a tunnel on Asmari Formation has been studied using 2d geolectrical method. Two different arrays have been merged to obtain more suitable result along the tunnel. Based on result, a fault has been recognized as the main reason of such crushed zone and Prediction of width of the crushed zone has been proved after excavation.