Top-Down Method of Deep Basement Construction in Urban Area : a Comparison of Numerical Analysis and Field observation Data

도심지 지하굴착에 적용된 Top-Down 공법의 수치해석과 실측비교

Top-down Method of basement construction technique has been applied for building of the deep basement car park the close proximity of priceless historic buildings in LONDON. Numerical analysis for the prediction of ground movement of the surrounding buildings was performed in order to compare the field data at the various stages of excavation and support. The predicted results from the elasto-plastic analytical method were compared with the observed data and the agreement is very satisfactory. It may be concluded that the system of diaphragm wall supported by the permanent base slabs (Top-Down Method) was proved to be the most effective technique in terms of reducing any critical damage to the surrounding buildings.

런던시내의 역사적 건물들 주변에서 LONDON CLAY층을 굴착하고 지하 5층의 주차장 건설에 TOP-DOWN공법이 적용되었다. 인접 구조물들의 안전진단을 수치해석(F.E.M)으로 예측하고 현장에서 실측한 자료와 비교분석하였다. 사용된 탄소성 COMPUTER 모델은 현장계측값들과 비교적 잘 일치하고 있으며, 지하 연속벽(DIAPHRAGM WALL)을 이용한 TOP-DOWN공법이 주변지반 변형을 감소시킬 수 있는 가장 효과적인 방법으로 판명되었다.