Application of Geosynthetic-Reinforced Soil Walls for Debris Flow Mitigation
Date Issued
2014
Date
2014
Author(s)
Shih, Wei-Ting
Abstract
Geosynthetic-reinforced soil walls can be classified into two types according to the design concept: Mechanically Stabilized Earth Walls (MSEW) and Geosynthetics Reinforced Soil Composites (GRSC). The former is designed and constructed in the same manner as a tied-back wall; while the latter is treated and designed as a composite material. In this study, the finite element software, PLAXIS, was used to analyze the behaviors of the aforementioned two types of walls under quasi-static lateral pressures induced by debris flows. The influencing factors investigated were as follows: (1)width of reinforced zone; (2) vertical spacing of reinforcement; (3) one-faced and double-faced walls; (4) shear strength of soil; (5) block-facing and grouted-facing walls; (6) continuous loading and periodic loading.
The results showed that the deformation at the top of the walls decreased as the width of reinforced zone increased. The distribution of lateral earth pressure at the back of wall-facing varied with the vertical spacing of the reinforcement; as the spacing was increased, the earth pressure between two layers of reinforcement would be smaller than the earth pressure close to the reinforcement. In addition, stress concentration was observed at the heel of a double-faced wall when its front side subjected to lateral pressure. Moreover, the factor of safety tended to increase as the wall was subjected to small lateral pressure, but it then decreased with increasing lateral pressure. The factor of safety of the wall was also affected by the shear strength of soil, the thickness of double-faced wall, and the facing type of wall. In the case of periodic loading, the stresses behind the wall-facing could not be fully dissipated when unloaded. However, the periodic loadings did not affect much the deformation of the wall-facing, the settlement, as well as the factor of safety of the wall.
Subjects
加勁擋土牆
土石流
側向荷重
整治
數值分析
PLAXIS
Type
thesis
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