EXPERIMENTAL VERIFICATION OF EQUIVALENT IMPROVEMENT RATE OF A NEW CPG METHOD

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  • 新たなCPG工法の等価改良率の実験的検証

Abstract

<p> A series of injection experiments and shaking table experiments were conducted with the aim of verifying the "equivalent improvement rate (ase)" especially the correction coefficient α, which indicates the degree of contribution of the improvement effect to the "cyclic volume rate (CVR)" used in a new CPG method (U/D method).</p><p> As a result, it was clarified that the "equivalent improvement rate (ase)" can be defined by the "equivalent improvement rate (ase)" using the correction coefficient α, not by the equivalent sum of the "improvement rate by mortar injection (as)" and the "cyclic volume rate (CVR)". The "equivalent improvement rate" can be defined by the following formula.</p><p> </p><p> 𝑎se = 𝑎s + 𝛼𝐶𝑉𝑅</p><p> </p><p> This correction coefficient α is obtained by a function of "cyclic volume rate (CVR) ". When the "cyclic volume rate (CVR)" of the U/D method is 20 % in this model experiment, the correction coefficient α is about 0.5, and the "cyclic volume rate "of 20 % can be expected to have an improvement effect (increase of density, K0 value and liquefaction resistance) equivalent to the "improvement rate (as)" of 10% by mortar injection.</p>

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