ANALYSIS OF ROCK MASS CLASS ON THE DYNAMIC STABILITY OF ROCK SLOPES DUE TO BLASTING VIBRATIONS BASED ON NEWMARK DISPLACEMENT ANALYSIS

• Main Author: Salsabilah Salwa, Nazdatul
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/67596
• Institution: Institut Teknologi Bandung

Generally, the slope excavation method can be done with mechanical digging tools or by blasting methods. The blasting method is usually carried out if the rock material that composes it is hard rock. Blasting vibrations can cause deformation of the rock so that these activities can interfere the stability of the slope if it exceeds a certain limit. In addition to blasting vibrations, the mechanical physical properties of slope-forming rocks also affect slope stability. Therefore, slope stability analysis was carried out using numerical modeling through Slide2 software with the Limit Equilibrium Method (LEM) to obtain dynamic Factor of Safety (FOS) values and also critical displacement values using Newmark Displacement Analysis . This research was conducted on hypothetical slopes with a slope height of 10 m and a slope angle of 55°. The cohesion value and internal friction angle of the rock mass on the hypothetical slope is determined based on the Rock Mass Rating (RMR). This research aims to determine the Factor of Safety (FOS) value of hypothetical slopes dynamically and the Critical Displacement (Ucrit) value for each rock mass class. The results showed that the dynamic FK and critical displacement of rock slopes for each rmr class were (1) Dynamic FOS = 16,4 and Ucrit = 10 mm, (2) Dynamic FOS = 7,6 and Ucrit = 12 mm, (3) Dynamic FOS = 6,8 and Ucrit = 18 mm, (4) Dynamic FOS = 5,4 and Ucrit = 19 mm, and (5) Dynamic FOS = 2,1 and Ucrit = 21 mm.