Masters Thesis

Effect of Deep-soil Mixed Soil Reinforced Panels on Reducing Seismic Amplification on Soft Clay - Comparison between the Rigid Wall and Laminar Containers

One of the many problems that engineers face is protecting structures from the disastrous effects of earthquakes, especially at soft soil sites. Soft soils are known to amplify the shaking during an earthquake resulting in higher accelerations at the ground surface, which can be more damaging for the overlaying buildings. in previous studies and in case histories, the use of ground reinforcement has shown positive results in mitigation against liquefaction and ground deformation during earthquakes, but little research was done to experimentally investigate the effectiveness of ground reinforcement in reducing ground motions. in this study, a method of reducing seismic shaking has been studied, which used ground improvement with soil reinforcement panels in the form of deep-soil mixed and soil-cement panels to strengthen a soft soil profile in both a rigid and laminar container. After filtering and comparing the data, comparisons were made in order to analyze the reduction in acceleration during the tests using differing sizes of soil reinforcement panels and the performance of the laminar and rigid containers. in summary, the deep-soil mixed, DSM, panels were more effective at 10% replacement ratios than at 20% replacement ratios at the surface of the clay, reducing the amplification in the clay by as much as 54% at 10% replacement ratio. in addition, the results from using a laminar container were not substantially different than the tests using a rigid container, showing a minimal boundary effect in the middle of the soil sample’s surface.

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