CRITICAL DISPLACEMENT OF CISUMDAWU HIGHWAY SECTION 4 ANDESITE ROCK SLOPE ANALYSIS DUE TO BLASTING VIBRATION USING NEWMARK DISPLACEMENT ANALYSIS METHOD

• Main Author: Rifqi Rahmadillah, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/67484
• Institution: Institut Teknologi Bandung

Analysis of slope the slope factor of safety (FoS) can be calculated using two principles, pseudostatically and dynamically. FoS that calculated based on the pseudostatic principle is too conservative due to the slope is assumed to receive the maximum load/acceleration without considering the duration of blasting. Calculation of dynamic FoS is more representative because it considers the duration of blasting. Dynamic FoS analysis can be done by using Newmark Displacement Analysis. Newmark Displacement Analysis is able to input the parameters of acceleration towards time graph from blasting vibration. The value of the acceleration that makes FoS equal to 1 is called the critical acceleration. When the seismic acceleration surpasses the critical acceleration, a displacement will be formed. Cohesion and friction angle are reduced to see the increase of displacement due to the increase of reducing factor. This reducing factor is called the Strength Reduction Factor (SRF). Dynamic FoS is the SRF value at the critical displacement point. After experimenting with two types of slope geometry, the hypothetical slope and the slope of the Cisumdawu Toll Road Section 4 STA 32+400 then with three variations of the PPA value, 0.2g; 0.254g; and 0.3g it was found that the critical displacement value of the Cisumdawu highway section 4 andesite rock slope was 12 mm.