The author proposed several mitigation measures that overcome the above-mentioned limitations (Otsubo et al., 2014). Photo 7 indicates crushed glass beads for backfilling. This material is obtained from recycling of waste glass bottles etc. Because its grain size is large (typically 3 mm), permeability is high and the developed excess pore water pressure dissipates quickly during earthquakes. Moreover, the uniform gradation makes emax-emin smaller than that of well-graded materials. Hence, the volume contraction during cyclic loading is small and the extent of liquefaction becomes less significant.