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A Field Case Research by Construction Management of Underground Excavation Construction Using Inverse Analysis Method

역해석 기법을 이용한 지하굴착공사의 시공관리에 관한 현장사례연구

  • Received : 2013.12.12
  • Accepted : 2014.02.05
  • Published : 2014.02.28

Abstract

In this study, we compared and analyzed the displacement of final excavation with measured value through an inverse analysis method used in urban excavation construction. We maximized the effectiveness of the inverse analysis method, and plan to achieve cost-effective and practical construction management in the field with identical conditions. As the first stage, we suggest an example of a field which has the inverse analysis method. We applied the inverse analysis method to three different fields on which construction and measuring were finished. Of these three fields, two fields showed a very satisfactory result. However, in one field, there were significant differences between the analysis and measured value. The result of our analysis indicated that, we should unite the conditions of the inverse analysis method and field construction. We need to thoughtfully reconsider the RANKINE earth pressure application in a triangle type. This is because the uniformity of earth pressure is made by its arching effect, in the condition of the displacement of lower underground occurring widely, which is differentiated with the earth pressure conditions of RANKINE, even if the slurry wall has stiffness. Also, when recalculating the soil parameter, we should emphasize the adhesion of the weathering zone, and give experimental consideration to ground water level.

본 연구에서는 도심지 지하굴착시 많이 시행하고 있는 역해석기법에 의하여 최종변위를 예측하고 계측자료와 비교 분석함으로써. 굴착도중 역해석 기법의 효율성을 극대화 시키고, 동일한 조건의 현장에서 경제적이고 효과적인 시공관리가 이루어 질 수 있도록 하고자 한다. 첫 번째 단계로 역해석 기법을 적용한 현장을 사례로 제시하고 시공과 계측이 완료된 3군데의 다른 현장에 역해석 기법을 적용하였다. 두 곳 현장에서는 만족할 만한 결과를 도출하였으나 한 군데 현장에서는 해석치와 계측치와의 많은 차이를 보였다. 분석결과는, 역해석 조건과 굴착시공조건을 최대한 일치시켜야 하고, 지하연속벽이 강성의 연속벽체라 할지라도 RANKINE 토압조건과 상이하게 굴착하부의 변위가 크게 발생되는 조건에서는 토압의 전이현상으로 토압의 균등화가 이루어지기 때문에 삼각형 형태의 RANKINE 토압 적용성에 대한 신중한 제고가 필요하다. 그리고 토질정수 재산정시 풍화대의 점착력과 지하수위의 경험적 고려가 필요한 것으로 판단된다.

Keywords

References

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