ANALYTIC AND NUMERICAL ANALYSIS FOR WEDGE’S PROBABILITY OF FAILURE WITH VARIATION OF ANGLE OF FRICTION, COHESION AND JOINT ORIENTATION

• Main Author: SANDRIA (NIM : 12113041), FERI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22146
• Institution: Institut Teknologi Bandung

One of the important aspect to be considered in surface mining activities is slope stability against its potential of failure. One of the most likely failure to occur is the wedge failure due to the geological structures, specifically for many discontinuity intersecting on mine slope. The stability of the slope itself can be determined by the value of factor of safety, the deterministic calculation is commonly used. However, a probabilistic approach is also necessary because some parameters used for evaluating slope stability has an uncertain value in nature, such as angle of friction, cohesion and joint orientation. <br /> <br /> In the analytical calculation for probability of failure using the equation (Hoek et al., 1973), the cohesion and angle of friction is considered uncertain so that the value will be varied. To generate a random value, Monte Carlo method is used to simulate random values of cohesion and angle of friction. In the numerical calculation for probability of failure, joint orientation on the slopes is considered uncertain, another assumption is that there are many other joint not visible on the surface so that the values will be varied and analyzed using Rocscience Swedge 6.0 software. <br /> <br /> Through this research, it is known that due to the variation of angle of friction and cohesion, the slope is considered unstable because it does not meet the acceptance criteria in the mining industry (Wesseloo and Read, 2009). While the variation of joint orientation that is numerically analyzed gives less significant contribution to the safety factor. Therefore, it is important to overcome the slope so that the slope can be stable, things that can be done is to minimize the angle of overall slope to 36° so that the wedge is not formed at all, or with the same geometry the slope must be made and kept in a dry condition.