Strength and deformation properties of porous granular material and proposing of ground investigation method with focusing on elast-plastic deformation and crushing of its particle

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In order to evaluate the macro-properties from the micro-properties of pumice sand, a series of experimental tests and simulations were performed. As a result, the crushing strength of pumice sand particle was much smaller than that of the other sand particle (e.g. silica sand such as Toyoura sand). The tip resistance of pumice sand during cone penetrating was also much smaller than that of Toyoura sand, it was because of much small particle crushing strength. The normalized tip resistance and ratio of sleeve friction of pumice sand and Toyoura sand were plotted on the Robertson's soil classification figure and both are distinguished easily and it is supposed to judge if the pumice sand layer were existing on a site with the Robertson's soil classification figure.