NUMERICAL MODELING OF TILT-TESTING IN LABORATORY SCALE

• Main Author: Belly Sahetapy, George
• Format: Theses
• Language: Indonesia
• Subjects: Pertambangan dan operasi berkaitan
• Online Access: https://digilib.itb.ac.id/gdl/view/54238
• Institution: Institut Teknologi Bandung

The parameter that affects the shear-strength in unfilled joints is the peak friction angle of the discontinuous field and it is determined by the roughness, joint wall compressive strength, basic friction angle (?b) of the dry, flat, and non-dilatant surface as well as the cohesion value assumed to be zero (Barton, 1977). Several previous studies, Barton and Choubey (1972), Barton (1973), Barton and Bandis (1983), Alejano et.al (2018), then Kilikily (2019) and Harianto (2019) developed a shear test in tilt-testing in laboratory to estimate the value of basic friction angle, tilt angle from various Joint Roughness Coefficient and discontinuous of rock joint roughness with a back calculation approach from the results of the tilt-testing. This research continues previous research (Harianto, 2019) for carried out numerical modeling on the tilt-testing of the rock joint to study shear deformation and stiffness characteristics in the discontinuity plane such as Joint Shear Stiffness (JKS), Joint Normal Stiffness (JKN) on tilt-testing in laboratory with variations in JRC values (0-20) with the help of the Universal Distinct Element Code (UDEC) version 4.00. The JKS and JKN values for the numerical approximation of the test sample represent the rock joint with a variation of the Joint Roughness Coefficient JRC = 0 to JRC = 20, respectively 2.646,1 – 4.500 MPa/m and 26.461 MPa/m – 45.000 MPa/m to meet the criteria modeling the displacement before failure by 10% of the length of the test sample (?_lab=?_UDEC).