준설토와 기포를 혼합한 인공지반의 연약지반개량 적용성 평가

Abstract

A series of triaxial and unconfined compression tests were performed to investigate behaviors of Lightweight Foamed Soil (LWFS) composed of dredged soils, cement and air foam, and cured at underwater conditions. LWFS could be substitute of normal soils used in backfill to earth structures and embankment materials for soft ground improvement in port and harbor project because of certain effectiveness such as settlement reduction and earth pressure decrease due to its lightness. The density of LWFS will be increased if LWFS be cured at underwater conditions because high water pressure makes air foam disappear or demolish during the curing compared with LWFS cured at normal air conditions. This paper is to find the mechanical behaviors of LWFS cured at seawater depth of 5m and 10m, which simulates underwater curing conditions by underwater pressure simulator chamber developed during this study. In additions, new normalized factor formula, which takes account of mixing design conditions with compressive strength of LWFS, was proposed to consider mixing design factor for LWFS.