원형 수직구 굴착에 따른 발생 지반침하 분석
Analysis of ground settlement due to circular shaft excavation
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지반굴착은 필연적으로 인접지반의 지반변위를 유발시키며, 지반변위에 노출된 구조물 및 시설물들은 다양한 피해를 입을 수 있다. 따라서 굴착유발 인접구조물 및 시설물의 손상 및 피해를 최소화하기 위해서는 우선적으로 굴착으로 인해 발생하는 인접지반에서의 지반변위(침하 및 수평변위)를 예측하여야 한다. 흙막이 굴착 유발 지반변위 정보는 상대적으로 많이 존재하지만 원형 형태의 수직구 굴착에 대한 지반변위 정보는 충분치 않다. 본 연구에서는 수직구 굴착에 대한 사례분석 및 흙막이 굴착과의 비교를 통해서 수직구 굴착유발 인접지반 침하예측에 대한 정보를 제공하고자 한다. 본 연구를 통해서 수직구 굴착 시 침하관리 기준으로서 흙막이 굴착의 침하기준을 사용하는 것은 안전성 측면에서 보수적인 접근방법으로 판단되나 경제성 측면을 고려할 때 벽체의 과다설계를 초래할 수 있어 수직구 굴착에 대해 보다 합리적인 침하기준이 필요한 것으로 나타났다.
Abstract
Ground excavation inevitably causes ground displacement of adjacent ground, and structures and facilities exposed to ground displacement may suffer various damages. Therefore, in order to minimize the damage and damage to adjacent structures and facilities caused by excavation, ground displacement (settlement and horizontal displacement) in the adjacent ground caused by excavation must first be predicted. There is many ground displacement information induced by general braced cut excavation, but the information is not enough for circular shaft excavation. This study aims to provide information on the estimation of ground settlement caused by circular shaft excavation through the case analysis of circular shafts and comparison with braced cut excavation. From this study, it was found that the use of the settlement criterion of braced cut excavation as the settlement management criterion for circular shaft excavation is a conservative approach in terms of safety. But when considering the economic aspect, it may result in overdesign of the wall and therefore, a more reasonable settlement criterion can be needed for circular shaft excavation.
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