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PHYSICAL AND DYNAMIC PROPERTIES OF THE VOLCANIC ASH SOIL IN THE HEAVILY DAMAGED SITE OF THE 2016 KUMAMOTO EARTHQUAKE, MASHIKI TOWN

Some studies indicated one possible factor; the spatial difference in site amplification effect of the surface ground should bring on the heavy damage to the limited area in Mashiki town during the 2016 Kumamoto earthquake. In order to investigate the actual soil property of the area for the experimental proof of the above mentioned assumption, we obtained undisturbed volcanic ash soils of the surface ground at the site close to the seismic station recording the M J 7.3 mainshock in the heavily damaged area by using the triple-tube sampler. The obtained features of physical and dynamic soil properties of the soil core sample based on the laboratory soil testing are summarized as follows; (1) The grain size of the volcanic ash soil varies widely. (2) The soil particle density of sand and gravel is lighter than that of clay. (3) The dynamic properties of the volcanic ash soil do not depend on the soil type and the confining stress, i.e., the depth. (4) The strain dependencies of shear modulus ratio and damping ratio of the volcanic ash soil are similar to the standard ones of sand and clay, respectively. In addition, we investigated the depth dis-tribution of density at the same site by the loggings, and recognized the similarity in density of each soil type around the area.