Abstract
Fill compaction in the construction of Geosynthetic Reinforced Soil (GRS) mass is typically performed by operating a vibratory or roller compactor, which in turns imposed a compaction load in direction perpendicular to the wall face. The compaction process resulted in the development of the so-called compaction-induced stress (CIS), which may subsequently increase the stiffness and strength of the fill material. Compaction process is normally simulated using one of the following compaction procedures—(i) a uniformly distributed load acting on the top surface of each soil lift, (ii) a uniformly distributed load acting on the top and bottom surface of each soil lift, and (iii) a moving strip load with different width. Uncertainties such as compaction procedures, compaction and surcharge loads led to the disparity in studying the mechanism of GRS mass. This paper aimed to study the impact of compaction load, compaction procedure, surcharge load and CIS on the stress-deformation behavior of GRS mass via the simulation of a 2 m high Soil Geosynthetic Composite (SGC) mass and a 6 m high GRS mass. The results were examined in terms of reinforcement strains, wall lateral displacements, and net CIS. Results from the analysis show the important impacts of compaction conditions on the stress-deformation behavior of SGC mass and the CIS.
Highlights
Reinforced soil walls was introduced some sixty years ago in the 1960s; the technology incorporated metallic strips in the compacted fill together with a wall face to gain and maintain stability.Polymeric geosynthetics was later replaced the metallic strips as reinforcement
The objective of this study is to examine the impacts of several factors such as compaction procedures, compaction load, and surcharge load on the stress-deformation behavior and the development of compaction-induced stress (CIS) in Geosynthetic-Reinforced Soil (GRS) mass
The effect of simulated compaction procedures, compaction loads, surcharge loads have been examined via the simulation of the Soil Geosynthetic Composite (SGC) mass and compared with the experimental lateral displacements and reinforcement strains
Summary
Reinforced soil walls was introduced some sixty years ago in the 1960s; the technology incorporated metallic strips in the compacted fill together with a wall face to gain and maintain stability. Polymeric geosynthetics was later replaced the metallic strips as reinforcement. The reinforced soil walls are designed by considering the strips as quasi-tieback tension members, and are commonly designed using the design methods such as the American Association of State Highway Transportation. The significant beneficial effect of placing sheet reinforcements have gained increasing attention in recent years. Studies mainly focused on the influence of reinforcement spacing in actual construction and results validated by field-scale experiments. Reference [4] performed large unconfined compression tests with non-woven geotextiles to evaluate the behavior of reinforced soil under various spacings; Reference [5]
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