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

Abstract

 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.

 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.

 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.