Slope stability analysis using bishop method and kinematic analysis

Abstract

Mining activity, especially open-pit mining, has caused an effect on the nearby environment. One of the most visible impacts caused by mining activity is the change in the nearby landscape. Steep slopes are common in open-pit mining area, thus the chance of landslides happening is high. To determine areas that are prone to landslides, the analysis of slope stability in the mining area is deemed necessary. “Bishop” methodology is used to determine the safety factor (SF) with the aid of “Rocscience Slide” software using “Mohr-Coulomb” strength type, with weight, cohesion, and friction angle as units in the parameter. And then a kinematic analysis is done by Stereonet projection in “Dips” software to determine the type of landslide. The safety factor value gained from the calculation is 1.112, and then after the treatment of slopes has been done, the safety factor value increases to 1.772, when referring to the bowless classification, which SF value> 1.25, it can be said that this slope is in a stable condition. After kinematic analysis had been done the type of landslide determined is “Wedge”. So it can be concluded that the slope on the east side of the pit is not safe, with a possibility of a Wedge type landslide occurring. But by changing its geometry we can produce a Safety Factor value that is considered safe.