Analisis numeris pengaruh muka air tanah dan perkuatan geotekstil terhadap stabilitas struktur dermaga

Abstract

The internal influences of slope instability, such as increased pore water within the slope, water flow characteristics, and soil shear strength, pose significant challenges in slope stability analysis research. In addition to these factors, the groundwater level also impacts slope stability. The influence of varying groundwater levels will be examined in this study to determine the extent of its effect on slope stability and the corresponding safety factors. With the advancement of technology, slope stability analysis can be conducted using applications as assisting tools, commonly known as numerical methods in slope stability analysis. Geostudio is one software specifically designed for accurate slope stability analysis. The analysis process involves utilizing five methods available in Geostudio, namely the Morgenstern-Price, Spencer, Bishop, Janbu, and Ordinary methods. In this study, Geotextiles are chosen as the slope reinforcement method. The parameters include soil unit weight, internal friction angle, cohesion, Poisson's ratio, and soil elasticity modulus. Based on the analysis results using the methods mentioned earlier, for both unreinforced and reinforced slope conditions and variations in groundwater levels, the most significant safety factor (SF) obtained for the unreinforced slope is 0.269 using the Morgenstern-Price method. At the same time, the highest SF value of 2.503 is achieved for the reinforced slope using the Bishop method. The significant increase in the safety factor, approximately tenfold, as a result of geotextile reinforcement proves its effectiveness in slope stabilization.