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Seismic Performance Evaluation of Improved Jet Grouted Grid Form with Horizontal Slab in Liquefaction Mitigation

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Document pages: 21 pages

Abstract: A chain event of the 2016 Kumamoto earthquakes caused considerablegeotechnical damage related to liquefaction in many places around Kumamotoplain. Many low-rise houses and traditional Japanese style houses, which wereconstructed on shallow foundation,suffered differential settlement and tilting due to liquefaction. To mitigatethe building damages due to the liquefaction, a new countermeasure method of jet grout grid formwith a horizontal slab is introduced in this study. The effectiveness of the proposed technique was evaluated throughphysical modelling and numerical modelling. As a part of the physical modelling,a set of 1 g shaking table tests for unimproved case and improved case were performed, in which the mitigation effects of thegrid form with a horizontal reinforcing slab were examined based on the acceleration,excess pore water pressure ratio as well as ground settlement. Numericalsimulation was also performed for assessing the effect of improved method on soil-structure interactionand building settlement during theearthquake. The physical and numerical results confirmed thatthe grid form with horizontal slabreinforced method is effective in settlement control and offers favorablecontribution in liquefaction mitigation.

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