Abstract
Occurrence of earthquake generates both horizontal and vertical ground motions. In saturated sands, combination of generated ground motions and pore water pressures induces soil liquefaction. In this study, a composite skirted ground reinforcement system was developed to mitigate generation of pore water pressure in liquefiable soils and also to attenuate incoming ground motions to the foundation. The composite system contains Polyurethane foam as an isolation barrier for ground motion attenuation with stone columns for improving both soil densification and drainage. The performance of this composite reinforcement system was evaluated under repeated acceleration loading conditions to estimate its efficiency. For testing, saturated ground model having 40% and 60% relative density was prepared and investigated with and without the composite reinforcement system. Test results showed that, the developed skirted ground reinforcement system effectively mitigates the interaction of incoming ground motions with the foundation and also improves the reliquefaction resistance of soil compared to that of unreinforced ground.
Highlights
Earthquake induced ground motions always pose threats to the safety of infra-structures
The acceleration response of unreinforced model ground is indicated by green colour and that of skirted barrier reinforced model ground is indicated by blue colour in Fig. 7 (a) and 7 (b)
About 72% reduction in acceleration response at 0.2g shaking in case of 40% density ground and about 76% reduction at 0.3g shaking in case of 60% density ground was observed with the provision of skirted barrier reinforcement system
Summary
Earthquake induced ground motions always pose threats to the safety of infra-structures. An attempt has been made to develop a synergized isolation barrier system in the form of definite boundary of infill material that can absorb the incoming ground motions generated during dynamic loading and contain suitable reinforcement member which can reinforce and minimizes generation of pore water pressures during dynamic loading. For improving reinforcement and drainage characteristics, the barrier system was installed together with stone column improvement system within the confined zone of saturated ground This combined reinforcement technique otherwise called as composite skirted ground reinforcement system provides an effective solution in mitigating ground motion interaction with the sub-structure and resists generation of pore water pressures inside the saturated ground during dynamic loading. It can be observed that installation of composite skirted isolation barrier system effectively mitigates ground acceleration and mitigates generation of pore water pressures during repeated loading. The confined skirted ground reinforcement system showed better performance than untreated ground
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