Considering the road building effect on the occurance of surface landslides by using the slope stability model (Case Study: Kalat Basin)

The main problem imposed on the lands managers all around the world is the slope instability in steep mountainous areas. The problem cause life harms and money damages in the roads. Studying the slope features and the slope stability analysis are important in detecting and knowing their roles in the landlide phenomenon. The analysis is done by evaluating the phenomenon risk in the aquifer basins. The purpose of this research is analyzing the role of road building in occurring the surface slides in the natural slopes by using the FLAC SLOP model which finally results in offering some guidelines to manage the region in an optimal way. From the point of view of slides. Or landslides. In this research, at first 7 sliding slopes next to the roads were determined. After that, all the parameters related to slope stability model and its analysis with the field studies were detected. Next the soil sampling and analyzing the topography of the slopes were extracted. And next, these parameters were incorporated into the slope stability model to determine the slopes factor of safety(FS) and the FS was obtained. The research results showed that slope stability model is very effective in determining instability in the slopes which were slid because of the road making. Because the factor of safety(FS)was obtained to be less than 1(one) for the sliding slopes. Moreover, road constructing in slopes with acuter steepness(more than 17 degrees)decreases the stability of slopes. By using this model, the unstable slopes could be detected and some protective mechanism could be specified to increase the stability factor or factor of safety. In this way, the nails vaccinating mechanism in the slope number 5, a location 37 ° 5 '3" north latitude and 59 ° 40' 27" east longitude increases the factor of safety from 0/67 to 2/75 and the tracing mechanism in the slope number 4, With geographic coordinates 36 ° 59 '31 "north latitude and 59 ° 41' 56" east longitude increases the stability or safety factor from 1.10 to 1.93. And finally we can determine the best way to do the protective mechanism.