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A Numerical Analysis of Landslide Movements Considering the Erosion and Deposition along the Flow Path

DOI: https://doi.org/10.22146/jcef.47514

Aditya Putra Pratama, Hary Christady Hardyatmo, Fikri Faris

Abstract:

The construction of a basement in a multi-storey building requires deep excavation works. Excavation causes land instability; hence the work needs to be done by a particular handler. In some cases, deep excavation is carried out on soft soil which has a very high level of soil instability; therefore it needs a specific handling method such as ground anchor as an alternative. Apartment construction is mostly constructed by including deep excavation works. This study aims to conduct parametric research on the effect of using anchor on the stability of deep excavation. The analysis was started by performing various slope anchor modelling with the number of anchors reaching four pieces. From the results of the study, the most efficient use of anchor was selected and then proceed with modelling various anchor bond lengths. The last stage is to know the effect of giving various prestresses to the anchor. All of the modelling will be examined for its influence on the stability of the deep excavation by observing the horizontal displacement and the forces that occur on the secant pile. From the analysis results, the most optimal use of anchor is the use of two anchors with a 45o slope, 4.5 m of first (A) and second (B)  anchors of bond length, 15 m of free length, 2.5 m vertical distance, 1.2 m horizontal distance of anchor and 200 kN of prestressing. However, secant pile needs to be strengthened because the applied moment (1300 kNm) is higher than the moment resistance (1238 kN).

Keyword:

Deep excavation; Ground anchor; Secant pile; Parametric Study; Prestresses

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