학술논문
시멘트혼합처리토를 활용한 경사 자립식 흙막이벽의 설계법과 해석법에 관한 연구
The Design and Numerical Analysis Method of Inclined Self-Supported Wall Using Cement Treated Soil
The Design and Numerical Analysis Method of Inclined Self-Supported Wall Using Cement Treated Soil
Document Type
Article
Source
한국지반신소재학회 논문집, 22(3), pp.11-25 Sep, 2023
Subject
Language
한국어
ISSN
2287-9528
2508-2876
2508-2876
Abstract
본 연구에서는 시멘트혼합처리토를 활용한 경사 자립식 흙막이공법에 대한 설계법과 해석법에 대하여 연구하였다. 경사 자립식흙막이 벽체의 경우 경사에 따른 주동토압계수의 감소와 자중효과로 주동측압이 감소하고 수동토압계수의 증가와 자중모멘트의증가로 인해 전체적인 안정성이 증가하였다. 흙막이 벽체는 경사에 따라 굴착측으로의 전도파괴에서 활동파괴로의 형태 변화가발생되었고, 최적의 경사는 10°인 것으로 평가되었다. 수치해석에서의 전체 안정성은 강도감소법과 비교하여 한계평형해석이 보수적인 결과를 도출하므로 설계 시 본 방법으로 검토해야 하는 것으로 나타났다. 매개변수 연구 결과, 지지력파괴와 압축파괴에 대한안정성은 상재하중이 작은 경우(약 20kPa 이하) 경사 10°이상에서는 크게 증가하지 않았다. 배면 지반의 점착력이 있는 경우 수치해석과 유사한 결과는 점착력을 고려한 경우로 나타났다. 활동, 전도, 전단, 인장에 대한 안정성은 벽체의 두께에 비례하여 증가하지만, 일정 경사각(약 10°) 이상에서는 벽체의 두께와 상관없이 지지력과 압축응력의 안정성에 큰 변화가 없는 것으로 평가되었다
In this study, the design and numerical analysis method of the inclined self-supported wall using cement treated soil were studied. In the case of the inclined self-supported wall, the active earth pressure decreased due to the decrease in the coefficient, Ka according to the slope (angle) and the weight decreasing effect, thereby increasing the overall stability. The wall with the slope caused a change in failure mode from overturning to sliding on the excavation side, and the optimal slope was evaluated to be about 10°. Compared to the strength reduction method, the overall stability in numerical analysis results in conservative results in limit equilibrium analysis, so it was found that this method should be attended when designing. As a result of the parameteric study, the stability on bearing capacity and compression failure did not significantly increase above the slope of 10° when the surcharge was small (about 20kPa or less). In the case of cohesion of the backfill, The results similar to numerical analysis were found to consider cohesion. It was evaluated that stability on sliding, oveturning, shear, and tension failure increases in proportion to the thickness of the wall, but there is no significant change in the stability on the bearing capacity and compressive failure regardless of the thickness of the wall above a certain angle (about 10°).
In this study, the design and numerical analysis method of the inclined self-supported wall using cement treated soil were studied. In the case of the inclined self-supported wall, the active earth pressure decreased due to the decrease in the coefficient, Ka according to the slope (angle) and the weight decreasing effect, thereby increasing the overall stability. The wall with the slope caused a change in failure mode from overturning to sliding on the excavation side, and the optimal slope was evaluated to be about 10°. Compared to the strength reduction method, the overall stability in numerical analysis results in conservative results in limit equilibrium analysis, so it was found that this method should be attended when designing. As a result of the parameteric study, the stability on bearing capacity and compression failure did not significantly increase above the slope of 10° when the surcharge was small (about 20kPa or less). In the case of cohesion of the backfill, The results similar to numerical analysis were found to consider cohesion. It was evaluated that stability on sliding, oveturning, shear, and tension failure increases in proportion to the thickness of the wall, but there is no significant change in the stability on the bearing capacity and compressive failure regardless of the thickness of the wall above a certain angle (about 10°).