Analysis of Perimetrical Ground Settlement Behavior for Deep Excavations in Urban Areas

도심지 깊은 굴착으로 발생하는 인접 지반 지표침하 분석

  • 양구승 (정회원, 삼성물산 건설부문 기술연구소) ;
  • 김명모 (정회원, 서울대학교 토목공학과)
  • Published : 1997.04.01

Abstract

Adjacent ground surface settlements by deep excavations are analyzed by field observations in the areas where excavations are performed in sandy soils or weathered soils underlain by rocks, First, the magnitude and the distribution of ground surface settlements, which are developed before main excavation activities (e. g., diaphragm wall installation and center pile installation) , are measured and analyzed. Secondly, the magnitude and the distribution of ground surface settlements by main excavation are measured and analyzed. And the results are compared with the predictions obtained by the empirical methods. Through case studies performed on the excavation sites where adjacent ground surfaces or structures are damaged by excavation activities, upper limit location of ground surface cracks are investigated.

풍화토 및 모래질 충적토가 암반위에 쌓인 형태로 구성된 국내 수도권 도심 지역에서, 깊은 굴착 공사로 인하여 발생하는 인접 지표의 침하에 대해 현장 측정을 중심으로 연구를 수행하였다. 먼저, 토류벽 설치, 중간 말뚝 설치 등 본격적인 굴토 공사가 진행되기 이전의 공정으로 인한 인접 지표침하량, 침하 영향거리 등을 측정, 분석하였으며 다음으로, 본격적인 굴토로 인하여 발생하는 인접 지표의 침하에 대해 침하량, 침하 영향거리 등을 측정, 분석하고 균질한 사질토 지반이나 단단한 점토 지반에 대해 기존에 제시된 연구 결과와 비교하였다. 또한 굴착 공사시 과도한 변형으로 인하여 인접 지표 및 구조물에 균열 등의 피해가 발생한 7개 현장 사례를 통하여 굴착 공사로 인한 인접 지표의 균열 발생 범위에 대하여 분석하였다.

Keywords

References

  1. 94 가을학술발표회 논문집 버팀굴착에서 인접 구조물의 영향평가 김학문;(등)
  2. Foundation Analysis and Design, 4th Ed. Bowles,J.E.
  3. JSMFD,ASCE v.92 no.SM4 Surface settlement adjacent to braced open cuts Caspe,M.S.
  4. Found. Eng.Vol. 2 ASCE.Proc. of Congress v.2 Movement control of excavation support systems by iterative design Clough,G.W.;Smith,E.M.;Sweeney B.P.
  5. Geotechnical special publication No.25,ASCE Construction induced movements of insituwalls, Design and performance of Earth Retaining Stuructures Clough,G.W.;O'Rourke,T.D.
  6. FHA Vol. 1 PB-257 210 Lateral support systems and underpinning Goldberg Zoino and Associates
  7. Geotechnical instrumentation for monitoring field performance John dunnicliff
  8. ASCE Proc. of the Specialty conf. on Performance of Earth and Earthsupported Structures The performance of a subway excavation Lambe,T.W.;Wlfskill,L.A.;Jawarski,W.E.
  9. NAVFAC(1982), DM-7.2
  10. Ph. D. thesis, Univ. of Illinois at Urbana-Champaign A study of two braced excavations in sands and interbedded stiff clay O'Rourke,T.D.
  11. Proc. 0f 7th Inter. Conf. on Soil Mech. and Found.Eng,.Mexico v.4 Deep excavations and tunnelling in soft ground Peck,R.B.
  12. Ph.D.thesis,Churchill College,Cambridge Univ. Field and theoretical studies of the behaviour of ground around deep excavations in London clay St.John