Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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Analysis on Impact Factors of Open-cut Type Excavation Work using Numerical Analysis Method

수치해석기법을 이용한 개착식 지반굴착공사의 영향인자 분석

  • Received : 2013.08.23
  • Accepted : 2013.09.23
  • Published : 2013.09.30
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Abstract

In this study, an analysis about the causes of different types of excavation on accidents is required in order to prevent the frequently occurring accidents related to the earth retaining structure and excavation. Also, analysis of influence was performed by using numerical typical soil conditions and construction trend using numerical analysis method. According to the analysis results of 25 accident cases, the main influence factors were found as following: insufficient of soil survey, instability of temporary facility and lack of groundwater treatment, etc. Furthermore, in the numerical analysis result of 22 cases, drainage method was occurred larger settlement than waterproof method in the Inland. In case of applying the earth anchor method, it needs more detailed in the regions, which are discovered soft ground or rock discontinuities. Also, The consolidated clay absolutely needs further consideration of excess hydrostatic pressure.

우리나라 지반공학 기술의 발달로 지반굴착 공사가 대규모로 수행되고 있으나, 지반굴착시 공사현장 또는 인접구조물에 직,간접적인 피해를 유발하는 사고는 여전히 빈번히 발생하고 있다. 특히 주거시설이나 상업시설이 밀집해 있는 도심지의 지하터널, 도시철도 역사, 대규모 상업시설, 초고층 빌딩의 기초 공사 등으로 인한 지반굴착관련 사고가 빈번히 발생하고 있어 경제적인 손실 뿐 아니라 인명피해가 발생하여 사회적인 비용이 급속히 증가하고 있는 실정이다. 본 연구에서는 빈번히 발생하는 개착식 흙막이 굴착관련 사고를 방지하기 위하여 최근 발생한 개착식 흙막이 굴착공사로 인한 다수의 사고 및 인접시설물에 영향을 끼친 사례를 수집, 분석을 수행하여 사고발생 원인에 대하여 고찰하고, 수치해석기법을 사용하여 국내 대표적인 지반조건(내륙, 해안특성) 및 공사공법에 따른 굴착시 영향 분석을 수행하였다. 25건의 사고사례를 분석한 결과, 주요 영향요인으로 지반조사의 부실, 가시설 구조체의 불안정 및 지하수의 처리 미흡 등으로 나타났으며, 이 외 여러 요인들이 복합적으로 작용하여 굴착현장에 문제를 발생시키는 것으로 나타났다. 국내의 대표적인 지반조건 및 시공경향을 고려한 22개의 case에 대한 수치해석결과는 일반적인 내륙지역에서는 차수공법에 비해 배수공법에서 침하가 크게 발생하고, 연약지반 및 암반의 불연속면이 발달한 지역에서는 earth anchor 공법 적용시 면밀한 검토가 필요하며, 압밀이 진행 중인 점토지반에서는 과잉간극수압에 대한 고려가 반드시 필요한 것으로 나타났다.

Keywords

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