STUDY OF EFFECT OF SHEAR PLANE ROUGHNESS ON SHEAR STRENGTH WITH DIRECT SHEAR STRENGTH TEST MODELLING

• Main Author: Choirul Viqri Mubarok, Muhammad
• Format: Final Project
• Language: Indonesia
• Subjects: Pertambangan dan operasi berkaitan
• Online Access: https://digilib.itb.ac.id/gdl/view/51450
• Institution: Institut Teknologi Bandung

Mine planning which includes activities such as slopes escavation and mine opening construction in underground mines are very dependent on the stability of the rock mass. This excavation activities can cause changes in the disturbed area. One of the movements that occurs is the friction in the weak plane of the rock mass. Analysis of the shear characteristics can be carried out by means of a direct shear test which will be used as a parameter for the shear strength of the rock mass. That parameters are very important to be considered in calculating the shear strength of rocks with irregular rock surfaces include normal stress, cohesion, internal friction angle, roughness of the rock, and shear surface area. In this study, it will be seen how the influence of the surface tilt angle of rock roughness (i) on the shear strength, cohesion and friction angle in rocks with numerical modeling. Modeling was carried out at three types of discontinuous plane roughness angles, namely 15°, 30° and 45°. Each of these models will be given a constant normal force of 0.2 kN, 0.4 kN, and 0.6 kN and a continuous addition of shear forces until the model is failure. The results obtained from the modeling show that the greater the normal stress applied, the greater shear strength. In addition, the results also show that the larger the sawtooth angle, the greater shear strength and material cohession, while the internal friction angle value is relatively constant. This research also shows that the sawtooth shear strength is more controlled by cohession than internal friction angle.