Influence of Rainfall Infiltration on Slope Stability with the 3D Realistic Stratigraphic Simulation

Abstract

This study integrates two sets of numerical software GMS (Groundwater Modeling System) and FLAC3D (Fast Lagrangian Analysis of Continua in 3 Dimensions) with Nan-shi-keng landslide area in Tainan City as the study area First use GMS to create a three-dimensional stratum model and water table of the study area and convert the GMS file into a FLAC3D readable format through MATLAB (MATrix LABoratory) Then conduct slope stability analysis This study has refined the steps of predecessor modeling and selected different combinations of grid elements to make the model’s plane smoother and closer to the site In addition this study displays the unsaturated zone in FLAC3D The simulation results show: (1) The amount of displacement the amount of shear strain and the potential sliding volume decrease as the groundwater table decreases while the safety factor increases (2) The unsaturated zone formed by infiltration will reduce the effective stress and shear strength so the slope will be damaged to a greater extent (3) Using the relationship between rainfall and safety factor the critical rainfall of the slope in this case is 641 9 mm

Date of Award	2020
Original language	English
Supervisor	Chao-Shi Chen (Supervisor)