Numerical Analysis of Lateritic-Gravel Slopes Affected by Rainfalls and Slope Protection Methods
Date Issued
2014
Date
2014
Author(s)
Yu, Chun-Tin
Abstract
In this research, the two sites studied are located at Pingding Village, Yunlin Country and at Mt. Da-Du, Taichung. The slope of the former site is composed of layers of lateritic soil, gravels, and mudstone, from top to bottom; while the latter is composed of only lateritic soil and gravel layers. The 2D FEM code, Geo-studio 2007, was used to simulate rainfall infiltration into the slopes in the analysis. The rainfall data were obtained respectively from Typhoon Mindulle and Typhoon Saola. The changes in the pore pressure, shear strength, and shear strain of the soil, and the yield zones and the factor of safety of the slope were investigated. Moreover, the effect of using a slope protection method, anchored geosynthetics system (AGS), to reinforce gravel slopes was also examined.
From the results of analysis, high shear strain and yield zones would develop in the gravel layer, which indicated that the potential failure zone would be in the gravel layer. Using the slice method for slope stability analysis, different results are found for the two sites due to their geological conditions. For the slope at Pingding Village, water would accumulate on the mudstone layer and thus resulted in lower factor of safety. On the other hand, in the slope of Mt. Da-Du, water would seep into deep depth, and therefore the factor of safety would be less significantly affected. Further, the AGS was found to be able to increase the factor of safety of the slope due to the drainage provided by the geosynthetics and the anchored forces induced in the soil nails.
Subjects
紅土
礫石
降雨入滲
數值分析
安全係數
錨碇織網系統
Type
thesis
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