VERIFICATION OF THE APPLICABILITY OF THE NEW CPG METHOD TO FINE-GRAINED SANDY SOIL

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  • 新たなCPG工法の細粒分混じり砂質土への適用性の検証

Abstract

<p> The upheaval control and the improvement effect of the new CPG method (U/D method) were verified under various experimental conditions in which the fine fraction content and the plasticity and nonplasticity of fine fraction were changed.</p><p> As a result, at fines contents up to about 30%, regardless of the plasticity or non-plasticity of the fines contents, the U/D method has provided a high upheaval control as equivalent to or higher than the result of application to conventional sandy soils.</p><p> The improvement effect was such that the static cone penetration resistance rose to 6.7 times at maximum and 3.8 times on average, in the case of U/D method, in comparison to those exhibited in the conventional CPG construction in sandy grounds that contained non-plastic fines. For sandy grounds that contained plastic fines, a maximum of 4.7 times and an average of 1.9 times the static cone penetration resistance of the conventional CPG construction were obtained in the case of the U/D method.</p>

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