PENGARUH STRUKTUR KEKAR TERHADAP KESTABILAN LERENG DINDING BAGIAN BARAT DAYA DAN TIMUR LAUT PADA DESAIN FASE 6 TAMBANG TERBUKA BATU HIJAU PT NEWMONT NUSA TENGGARA

Abstract

One of the safety factors that are important in mining (open pit mining) is a potential landslide on the slopes of the
mine wall. Landslides caused by two factors, namely external and internal factors. External factors such as mining itself
is blasting, excavation, loading and material transport. While internal factors, namely the existence of geological
structures or areas of discontinuity in the form of joint, faults, folds, veins, the condition of the rock mass, and slope
hydrology. Due to the geological structure is one of the important factors controlling the stability of the slope, then at
The studies will be discussed on the influence of geological structures is mainly joint structure.
To determine the influence of joint structure on slope stability conditions used two methods of analysis methods of
kinematic and limit equilibrium analysis methods. In the kinematic analysis software used to analyze data Dips general
direction joint, shear joint zones, veins, face slopes and friction angle. The second method is the method of limit
equilibrium analysis with the help of Slide ver 5.0 software using the data in the form of rock strength and the cohesion
and friction angle in the studied slope geometry.
From the analysis in that the slope can be part of Southwest wedge avalanches are possible, several nondaylighting

failure avalanches both wedge and fields on the Northeastern slope. From the analysis of equilibrium
analysis on the inner walls Southwest FK impaired, when there is a joint structure FK 1,376 before getting joint
structure FK value 1,417. And on the slopes of the Northeast, FK values before exposure to joint structure is 1,432 and
after exposure dropped to 1,177 joint structure which means the slopes in landslides condition. Joint structures that
directly affect the stability of a slope is stocky with criteria and slope direction parallel to the face of the slope, the closer
the distance stout slopes face, the amount of joint, stocky and thick. From the analysis on the Northeast slope, slope in a
critical condition that FK <1,2. It needs to be done to minimize the angle of slope face.