TRIAXIAL TEST AND DIRECT SHEAR STRENGTH TEST LABORATORY MODELLING USING FINITE ELEMENT METHOD

• Main Author: Vivid Permatasari, Nurhalimah
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/49952
• Institution: Institut Teknologi Bandung

Mining activities are activities to extract natural resources from the bowels of the earth, such as petroleum, natural gas, minerals and rocks, and coal. In making mine openings, a good initial design that considers the properties and material of the soil to be excavated is needed. When carrying out geotechnical investigations, it is necessary to know the material properties and the rock strength parameters. One of the rock strength parameters that need to be known in geotechnical investigations is the cohesion and internal friction angle. Both parameters were obtained through laboratory tests, namely the triaxial test and direct shear strength test using the same Mohr-Coulomb collapse criteria approach. In this research, the triaxial test and shear strength test modelling will be carried out directly in the laboratory using the finite element method. The results of laboratory tests for the sandstone sample have a cohesion of 0.127 MPa and an internal friction angle of 32o. Modelling is carried out in two rock behaviours, namely elastic and elastoplastic. Triaxial test modelling with elastic behaviour resulted in the cohesion of 0.145 MPa and an internal friction angle of 32o, whereas elastoplastic behaviour resulting a cohesion of 0.13 MPa and an internal friction angle of 31o. For the direct shear strength test models with elastic behaviour obtained a cohesion of 0.132 MPa and an internal friction angle within 29.42o, while with elastoplastic behaviour obtained a cohesion of 0.129 MPa and a friction angle of 22.58o. Modelling using the finite element method can also show stress distribution and displacement conditions as well as the shape of the collapse that occurs in rock samples that cannot be known if carried out by direct laboratory tests.