Conference Paper

Geosynthetic filters to Prevent Soil Piping and Internal Erosion

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Chapter
With the advent of ever-growing urbanization and industrialization, there exists a requirement for heavy infrastructures that can retain heavy earth masses and are sustainable in its functioning. The conventional earth mass retention methods using rigid retaining walls are not preferred for most of the projects, as they are expensive and are time-consuming for the construction when compared to the recently developed methods of earth mass retention by Mechanically Stabilized Earth (MSE) structures. MSE walls having large height when constructed in a single tier, often require a huge volume of excavation and an effective land area which is impossible to attain every time. Therefore, the most suitable alternative is to construct it in a tiered fashion. The tiered MSE walls can tolerate large differential settlements without distress, give a sound performance, are aesthetically appealing, are cost-effective, convenient, and provide simplicity in construction. However, the configuration of such walls may present several engineering challenges that have not been covered by the conventional design methods and calculations. This study aims to assess the performance and response of a multi-tiered 12 m high (H) MSE wall and compare it with a single-tiered MSE wall through numerical solutions based on finite element modeling. From the outcomes of this study, it is found that the normalized maximum lateral displacement of the facing of the wall (Δ/Η) is 5.4% and 1.71% in the single-tiered and three-tiered wall system respectively. Also, the factor of safety in three-tiered and single-tiered wall systems observe a growth of 9.4% and 8.4% respectively when the reinforcement length is increased, which establishes the improved performance of the tiered MSE walls and justifies its usage in place of single-tiered MSE walls.
Chapter
The land scarcity has built up the pressure on the engineers to bring a cost-effective and time-saving solution to utilize the ground with poor strength as a foundation bed for various structures. With the recent progress in the area of ground reinforcing techniques using geosynthetics, the extensive usage of geotextile materials as a reinforcing element in the soil to strengthen the load-bearing capacity of the soil mass and reducing the anticipated settlement of the footing pushes the researchers to evolve new methods to maximize the advantages received from the reinforced earth beds. In the above context, the provision of reinforcing layers with wraparound ends has brought additional improvement in the load settlement behavior of a strip footing resting over such reinforced soil mass but this recently developed technique lacks the appropriate guidelines/recommendations for the geometrical configuration parameters of the reinforcing layer to maximize the benefit from the reinforcing layer. Given the above, a comprehensive numerical study has been conducted to propose some recommendations on the geometrical configurations of the reinforcing layers. Furthermore, this study also investigates the influence of the geogrid–soil interface on the load-settlement response of the reinforced bed under vertical footing load. From the findings of the study, it is concluded that the width of the geogrid layers, governs the overall load-bearing capacity of the reinforced soil mass system, besides it, also suggests an optimum width of the geogrid layers, which equals 1.5 times the width of the footing should be used to maximize the effective utilization of the wraparound technique. Furthermore, it was also noted that appropriate assessment of the interface between soil and geogrid may bring an optimized design of the reinforced soil mass as a foundation bed for the footings.
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