Abstract
Abstract Polyurethane (PU) foam is a lightweight material that can be used efficiently as a ground improvement method in solving excessive and differential settlement of soil foundation mainly for infrastructures such as road, highway and parking spaces. The ground improvement method is done by excavation and removal of soft soil at shallow depth and replacement with lightweight PU foam slab. This study is done to simulate the model of marine clay soil integrated with polyurethane foam using finite element method (FEM) PLAXIS 2D for prediction of settlement behavior and uplift effect due to polyurethane foam mitigation method. Model of soft clay foundation stabilized with PU foam slab with variation in thickness and overburden loads were analyzed. Results from FEM exhibited the same trend as the results of the analytical method whereby PU foam has successfully reduced the amount of settlement significantly. With the increase in PU foam thickness, the settlement is reduced, nonetheless the uplift pressure starts to increase beyond the line of effective thickness. PU foam design chart has been produced for practical application in order to adopt the effective thickness of PU foam within tolerable settlement value and uplift pressure with respect to different overburden loads for ground improvement works.
Highlights
Polyurethane (PU) foam is a lightweight material that can be used e ciently as a ground improvement method in solving excessive and di erential settlement of soil foundation mainly for infrastructures such as road, highway and parking spaces
Buoyancy of lightweight materials is a major concern to cause uplift pressure that a ects the stability of structure
Uplift pressure is measured by assessing the di erences in hydrostatic pressure for existing condition and remedial condition as the pore water pressure after remedial work is increased underneath PU foam
Summary
Abstract: Polyurethane (PU) foam is a lightweight material that can be used e ciently as a ground improvement method in solving excessive and di erential settlement of soil foundation mainly for infrastructures such as road, highway and parking spaces. The ground improvement method is done by excavation and removal of soft soil at shallow depth and replacement with lightweight PU foam slab. Model of soft clay foundation stabilized with PU foam slab with variation in thickness and overburden loads were analyzed. With the increase in PU foam thickness, the settlement is reduced, the uplift pressure starts to increase beyond the line of e ective thickness. PU foam design chart has been produced for practical application in order to adopt the e ective thickness of PU foam within tolerable settlement value and uplift pressure with respect to di erent overburden loads for ground improvement works
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