ANALYSIS OF MOHR-COULOMB AND HOEK-BROWN FAILURE CRITERIA OF IGNEOUS ROCKS AND THEIR APPLICATION TO ANDESITE MINE SLOPES.

• Main Author: Adhi Rohman, Mifta
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/85449
• Institution: Institut Teknologi Bandung

Collapse criteria are an important aspect in slope stability. In slope stability, the Hoek-Brown and Mohr-Coulomb collapse criteria are widely used. To obtain the parameters of the collapse criteria, a triaxial test can be performed. For Using RSData software, the parameters ????????????, ????????, cohesion, and internal friction angle are obtained. For the Mohr-Coulomb collapse criteria, ordinary linear regression will be used, while Hoek-Brown uses a modification of the cuckoo search. The collapse criteria can be applied to obtain the safety factor of a slope. Slope modelling using andesite stone is due to the large number of andesite mines in Indonesia and in saturated conditions. Using the Janbu and noncircular methods, it was found that at an altitude of 25 to 500 m and angle variations from 20 ° to 90 ° the safety factor value using the Mohr-Coulomb criteria is always greater than Hoek-Brown. However, the higher the slope, the smaller the ?FoS value. This shows the influence of slope height, and failure criteria used in geotechnical modelling. From the results of the safety factor and failure probability, a graph is made that recommends the right slope geometry.