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Effectiveness of a Geocomposite-PVD system in preventing subgrade instability and fluidisation under cyclic loading
Abstract Instability of subgrade soil sometimes associated with soil fluidisation can lead to uncontrollable deformation and failure at a critical number of loading cycles for a given cyclic deviator stress and frequency. Although numerous laboratory experiments on the performance of Prefabricated Vertical Drains (PVDs) and geocomposites have already been carried out in the past, how effectively this combination can mitigate the potential for subgrade fluidisation under repeated (cyclic) loading is still not properly understood. The primary objective of this paper is to evaluate the integrated role of PVDs and geocomposite in preventing subgrade fluidisation using Dynamic Filtration Apparatus (DFA). Laboratory experiments show that the continuous dissipation of EPWP and the substantial reduction in drainage path lengths by PVDs can prevent subgrade fluidisation at shallow depths, while geocomposite can provide adequate surficial drainage and effective confinement at the ballast/subgrade interface. By measuring the Excess Pore Pressure Gradients (EPPGs) during cyclic loading, the test results convincingly reveal the promising performance of PVD-geocomposite combination under different loading conditions.
Highlights The integrated role of PVD and geocomposite system was evaluated to alleviate the occurrence of soil fluidisation The performance of geosynthetics was assessed under cyclic loading with the aim of dissipating the excess pore water pressure and controlling particle migration The dynamic filtration tests were carried out to measure the excess pore pressure gradients with and without geosynthetics The key factors that evaluate the performance of geosynthetics were studied under different loading conditions.
Effectiveness of a Geocomposite-PVD system in preventing subgrade instability and fluidisation under cyclic loading
Abstract Instability of subgrade soil sometimes associated with soil fluidisation can lead to uncontrollable deformation and failure at a critical number of loading cycles for a given cyclic deviator stress and frequency. Although numerous laboratory experiments on the performance of Prefabricated Vertical Drains (PVDs) and geocomposites have already been carried out in the past, how effectively this combination can mitigate the potential for subgrade fluidisation under repeated (cyclic) loading is still not properly understood. The primary objective of this paper is to evaluate the integrated role of PVDs and geocomposite in preventing subgrade fluidisation using Dynamic Filtration Apparatus (DFA). Laboratory experiments show that the continuous dissipation of EPWP and the substantial reduction in drainage path lengths by PVDs can prevent subgrade fluidisation at shallow depths, while geocomposite can provide adequate surficial drainage and effective confinement at the ballast/subgrade interface. By measuring the Excess Pore Pressure Gradients (EPPGs) during cyclic loading, the test results convincingly reveal the promising performance of PVD-geocomposite combination under different loading conditions.
Highlights The integrated role of PVD and geocomposite system was evaluated to alleviate the occurrence of soil fluidisation The performance of geosynthetics was assessed under cyclic loading with the aim of dissipating the excess pore water pressure and controlling particle migration The dynamic filtration tests were carried out to measure the excess pore pressure gradients with and without geosynthetics The key factors that evaluate the performance of geosynthetics were studied under different loading conditions.
Effectiveness of a Geocomposite-PVD system in preventing subgrade instability and fluidisation under cyclic loading
Arivalagan, Joseph (author) / Ph.D., F.ASCE Indraratna, Buddhima (author) / Ph.D. Rujikiatkamjorn, Cholachat (author) / Warwick, Andy (author)
Geotextiles and Geomembranes ; 50 ; 607-617
2022-03-04
11 pages
Article (Journal)
Electronic Resource
English
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