#TITLE_ALTERNATIVE#

• Main Author: GUMILAR (NIM 12101027), JEMMI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/8329
• Institution: Institut Teknologi Bandung

The stability of underground mining was influenced by some factor, such like the strength of material, cracked, underground water, vibration include the earthquake, etc. If the opening hole area in the underground mining need support, the support will give contribution to that mining stability. One of the other kind of support is rock bolt. <br /> <br /> <br /> Rock bolt is one of the supporting that if we use will be a part of rock mass. The research area at block 1A and block 2 south, part of 500 Ciurug’s level, tendon UBPE Pongkor. This area have a stope form with widht 25 m and height 5 m. This research have a purpose to find the installing model of split set that have more effective with separation be 5 model. Analysis of the programming resulted to find the best rock bolt installing model with analysing displacement in the observation point, normal and shear displacement, axial force and axial strain, and the last shear force on yhe split set added safety factor that calculated by analytic. B and C model can’t supported rock block, that the final analysis do to the A, D and E model. Displacement result in the horizontal axis show that A model getting displacement on the first and second observation point is 11,6 mm, and 10,9 mm. D model getting displacement on the first and second observation point is 50,7 mm, and 50,8 mm. E model getting displacement on the first and second observation point is 41,8 mm, and 41,8 mm. The same things happened in the vertical axis show that displacement on the first and second observation point in the A model is 21,2 cm, and 15,1 cm, D model is 16,3 cm and 13,3 cm, and the last E model is 12,9 cm and 11,6 cm. Oppener crack on the left side in the A model is 79,1 mm, D model is 5,182 mm and E model is 2,56 mm. Closure crack on the right side in the A model is 0,235 mm, D model is 0,228 mm, and E model is 0,221 mm. Shear left crack show the same trend that in the A model is 203,6 mm, D model is 170,8 mm, and E model is 132 mm. The biggest axial strain happened in the E model that value is -8,544 x 10-2 MN. Minus is way and that axial force holded the force to the split set. The last, the biggest value of safety factor happened to E model 3,22. A and D model is 2,58 and 2,90. Tha conclusion E model is relatively more effective disamping the other model. <br /> <br />