TRIAXIAL TEST AXISYMMETRIC ASUMPTION AND DIRECT SHEAR STRENGTH TEST PLANE STRENGTH ASUMPTION MODELLING WITH FINITE ELEMENT METHOD USING PHASE2 SOFTWARE

• Main Author: Septriadi, Kurnia
• Format: Final Project
• Language: Indonesia
• Subjects: Pertambangan dan operasi berkaitan
• Online Access: https://digilib.itb.ac.id/gdl/view/51503
• Institution: Institut Teknologi Bandung

Mining activity is a series of activities starting from the investigation of minerals to the marketing of valuable minerals such as minerals, rocks and coal. To make mine openings safe from landslides or collapses, mastery of geotechnical science is needed in making good designs by paying attention to the properties and soil material to be excavated. Rock strength parameters that need to be known in geotechnical investigations are cohesion and internal friction angle. Both parameters are obtained through laboratory tests, namely triaxial test and direct shear strength test. Both tests use the same Mohr-Coulomb collapse criteria approach and require mechanical properties values such as modulus young, poisson ratio, compressive strength as initial information. In this research, triaxial test modeling and direct shear strength tests modelling will be carried out by modeling two behaviors, namely elastic and plastic. The data used is through secondary data obtained from laboratory tests with a cohesion of 0.119 MPa and an internal friction angle of 28.02o, and other data of siltstone which include density, modulus young, poisson ratio, uniaxial compressive strength. The results of this research are in the form of cohesion and internal friction angle for each test. The triaxial test with elastic rock behavior has a cohesion of 0.121MPa and an internal friction angle of 27.9o, while in plastic rock behavior has a cohesion of 0.119MPa and an internal friction angle of 27.8o. Furthermore, the direct shear test with elastic rock behavior has a cohesion of 0.088MPa and an internal friction angle of 30.2o, while in plastic rock behavior it has a cohesion of 0.091MPa and an internal friction angle of 14.8o. In addition, this modeling can calculate the total displacement and show the strain conditions and the shape of the collapse that occurs.