DYNAMIC SLOPE STABILITY ANALYSIS DUE TO BLASTING ACTIVITIES USING PSEUDOSTATIC, NEWMARK AND DYNAMIC NUMERIC ANALYSIS

• Main Author: Lestari, Divia
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/80213
• Institution: Institut Teknologi Bandung

Blasting activities was carried out at Quarry A mine may result considerable ground vibration around rock mass slope which led to the deformation of the slope structure. Blasting vibration can increase the load on the slope resulting in reduced slope stability as indicated by safety factor and slope displacement value. This research was carried out the assessment of Quarry A slope stability under influence of blasting load using three methods : pseudostatic method, displacement Newmark and dynamic numeric. Quarry A slope is simulated to be in several condition of ground water level such as dry condition, half-saturated and fully saturated which is represented by Hu coefficient. Quarry A slope stability is analyzed at a distance of 30 m from the source of blasting using the LEM and FEM method by Slide2 and RS2 Software. The datas used in the analysis are physical and mechanical rock properties, model 2D slope of Quarry A, data vibration acceleration (PPA) to the blast duration. In the pseudostatic method, slope is influenced by constant maximum PPA value, whereas in statistic pseudostatic method using the statistical PPA value which are mean, standard deviation, minimum and maximum relative PPA and kind of data distribution. In displacement Newmark method, slope is influenced by data constant maximum PPA to blast duration during 3.75 s and rock mass strength reduction factor. In the contrast, slope dynamic numeric is analyzed using data PPA to blast duration and considered boundary dynamic, damping ratio and vibration frequency. Based on the analysis result from three methods, slope stability in saturated condition using pseudostatic and Newmark method produces the largest maximum value of total slope displacement about 2.66 cm while based on dynamic numeric it is 0.859 cm. Quarry A slope is stated stable and classified as having light damage status, which is small cracks likely to happen on the slope based on criteria FK minimum dynamic ? 1.1 and 0.5cm < displacement < 5cm.