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Journal of the Korean Society of Hazard Mitigation 2012;12(3):93-100.
Published online June 30, 2012.
Deformation and Stability Analysis of Embankment Foundation Soil Supported by DCM (Deep Cement Mixing) Columns and Geotextiles
Deformation and Stability Analysis of Embankment Foundation Soil Supported by DCM (Deep Cement Mixing) Columns and Geotextiles
Md. Mizanur Rahman, Young Dai Lee
Abstract
This study is based on finite element analyses performed by PLAXIS code to investigate the feasibility of modeling the effect of DCM (Deep Cement Mixing) columns in two dimension by a newly proposed method namely `Replacement Weighted Area`. The results of new method have been compared with the existing method of `Same Area Replacement Ratio` as well as with field observations. It has been found that the `Replacement Weighted Area` in plane strain element has provided reasonable predictions. In addition, a parametric study of the stability of geotextile-reinforced soil was performed in different layers of embankment with factors like the effects of tensile stiffness, number and length of reinforced layer. It has been observed that vertical settlements and lateral displacements have been reduced with increasing in tensile stiffness, number and length of reinforcement. However, over certain thresholds, number and length of geotextile did not enhance significant settlements and lateral displacements.
Key Words: Finite element method; Settlement; Lateral displacement; DCM column; Geotextile
요지
본 연구는 연약지반에 시공된 심층혼합공법(Deep Cement Mixing)에 의한 기둥의 효과를 새롭게 제안한 치환가중면적법(Replacement Weighted Area)을 이용하여 2차원으로 분석하는 것이다. 이를 위하여 이 방법에 의한 결과를 현장 계측치와 기존의 면적치환율법(Same Area Replacement Ratio)에 의한 결과와 비교하였다. 평면변형율요소를 사용한 치환가중면적법의 결과는 합리적인 예측치를 나타내었다. 이외에 보강토안정에 대한 파라미터 연구에서 보강재(geotextile)의 인장계수, 길이 및 층수와 같은 요인 등에 대한 효과도 성토층의 두께를 달리하여 검토하였다. 연직 및 측방변위는 보강재의 인장계수, 층수 및 길이가 증가함에 따라 감소하는 것으로 나타났으나 보강재의 숫자 및 길이가 일정범위를 넘어서면 침하 및 측방변위에 유의한 효과를 나타내지 않았다.
핵심용어: 치환가중면적법; 심층혼합공법; 면적치환율; 침하 및 측방변위
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