Engineering geology consideration for low-wall stability analysis in open-pit coal mine

Abstract

In low-wall stability analysis, there are many geological factors that must be considered; therefore, in determining the method and parameters, real conditions in field must be taken into consideration. This paper examines what factors need to be considered in low-wall stability analysis, including condition of the study area. The analysis method used in this study was back analysis on a low-wall slope where failure occurred, by collecting all the details of geological conditions and performing finite-element-based stability analysis to break down the contribution of each factor. This method is expected to provide detailed information about geological condition that may be a contributing factor to slope stability analysis. The result showed that physical and mechanical properties, slope length, bed thickness, bedding ratio, lithology type, and aquifer type need to be considered. These considered conditions become important factors in the analysis, especially in determining suitable slope stability method as well as evaluating reasonable results of low-wall stability analysis. Comprehensive slope stability analysis may help improving quality of slope to be optimal. The result of this analysis can be implemented for layered sedimentary rocks with low mechanical properties.