#TITLE_ALTERNATIVE#

• Main Author: HERU PRASSETYO (NIM 12103040), SIMON
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/9263
• Institution: Institut Teknologi Bandung

Conventional triaxial methods for obtaining failure criterion of rocks require testing multiple samples. A luxury not enjoyed when dealing with core recovered from boreholes. Consequently, a multistage test performed on a single plug is attractive not only because it requires a single sample but also it is both less expensive and requires less time. It has another advantage in minimizing sample heterogeneity. Previous studies using multistage triaxial test indicate that they are able to be an efficient approach to determining failure criterion and mechanical properties of rocks. However, the appropriateness of defining termination point of stress cycle is very critical and risky.<p> <br /> <br /> <br /> In this study, plugs of sandstone were tested using both conventional and multistage triaxial testing methods. In multistage test, the point before the sample exhibits signs of approaching failure is defined as a termination point. Failure criterion based on Mohr-Coulomb, Bieniawski I and Hoek-Brown were developed using data from UCS and both conventional and multistage triaxial testing method which gives results as the equations of strength envelope of sandstone.<p> <br /> <br /> <br /> From the failure criterion equations approached for sandstone, the multistage triaxial testing method gives significant results compared with the conventional method. Accordingly, it is obvious that multistage triaxial testing method is able to be an efficient approach to determining failure criterion of sandstone.