WIJAYA, CALVIN (2019) ANALYSING THE KINEMATIC RUNOUT BEHAVIOUR AND DEPOSITION PROCESS OF ASO-BRIDGE LANDSLIDE USING COUPLED EULERIAN-LAGRANGIAN FINITE ELEMENT METHOD. S1 thesis, UAJY.

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Abstract

Finite element method (FEM) is a powerful yet effective tool for studying the
onset of incipient landslide failures. The FEM has advantages over the traditional
limit equilibrium method due to the inclusion of the initiation time, and the
propagated runout behaviour of landslides. However, traditional FEM mostly is
using the Lagrangian approach which may be limited to model large deformation
material behaviour and the obtained results may experience numerical
convergence difficulty and not reliable. To solve the complex large deformation
problems, coupling both Lagrangian and Eulerian approach may have better
accuracy and feasible results. The study of coupled Eulerian-Lagrangian (CEL)
technique and its application is very limited in Indonesia. In this study, CEL finite
element technique is introduced and discussed through the application of Aso-
Bridge Landslide.
This study presents the investigation of the kinematic behaviour of sliding mass
on Aso-Bridge slope using Coupled Eulerian-Lagrangian (CEL) finite element
technique. The features of this study are the pre-failure mechanism (initial
condition) and post-failure runout behaviour. The sliding mass is analysed as a
Eulerian material type while the base is fixed and specified rigid in a Lagrangian
description. Eulerian elements will be used to undergo the extreme deformation as
the reference configuration to observe the kinematic behaviour of the sliding mass
when it deformed, while the meshing stays undeformed. The result of the
simulation will be validated by comparing between the study and the published
results to observe the kinematic behaviour and deposition process.
The simulations results show that Coupled Eulerian-Lagrangian (CEL)
formulation is stable and able to demonstrate the landmass transport large
deformation with convergent results. The proposed simulation indicates that the
meshing size and friction coefficient contribute a strong influence on the landmass
runout. Based on the analysis, smaller meshing size gives a more reliable and
realistic visual illustration of the deposition process while the friction coefficient
of μk = 1 has a better agreement in term of results with those published for the
previous study.

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