Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Analysis of Ground Movement During Diaphragm Well Panel Constructions in Sedimentary Marine Deposit

해성점토층에 실시된 지중연속벽 시공에 의한 지반의 변위 분석

  • Lee Cheol-Ju (Civil Technical Team, Construction Division, Samsung Heavy Industries Co., Ltd.)
  • 이철주 (삼성중공업(주) 건설사업부 토목기술팀)
  • Published : 2005.04.01
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Abstract

The ground movements during three. full-scale trial diaphragm wall (DW) panel constructions were monitored and analysed. The DW panels were constructed in reclaimed fill where sedimentary marine deposit and residual weathered soils are being consolidated. The monitoring data showed exceptionally large lateral ground movements of up to 293 mm near a trench due to the DW panel constructions, which is about 0.8$\%$ D, where D is the maximum excavation depth. It was observed that deliberate holding period of the trench resulted in a significant increase in the lateral ground movements of about 50-225$\%$. A pre-treatment of the marine deposit by installing a single line of jet grout columns around the trench prior to the excavation was found to be a very effective way of reducing the ground movements. The measured ground settlements were compared with some relevant case histories. DW panel constructions in sedimentary marine deposit are likely to cause maximum ground surface settlement up to 0.225$\%$ D.

본 연구에서는3개소의 지중연속벽(D) 시험시공에 의해 유발된 지반의 변위에 대한 분석을 실시하였다. DW의 시공은 최근에 실시된 매립에 의해 압밀이 진행중인 압측성이 높은 해성점토층 및 풍화잔적토 지반에서 실시되었다. 수평변위의 계측결과는 DW시공에 의해 최대 293mm의 매우 큰 변위가 발생함을 보여주고 있는데, 이는 약 0.8$\%$ D(D=최대굴착고)에 해당되는 값이다. DW의 시공 도중 굴착면을 의도적으로 방치하는 경우, 지반 변위가 약 50-225$\%$ 증가하였다. DW 시공 이전에 해성점토층을 제트 그라우트로 보강하게 되면 지반변위가 매우 효과적으로 감소된 것으로 관측되었다. 본 연구에서 관측된 지표침하를 유사한 조건에서 실시된 DW 시공사례에서 측정된 지표침하의 양상과 간접 비교한 결과에 따르면, 해성짐토층에 DW을 시공하는 경우 최대 0.225$\%$ D의 지표침하가 발생하는 것으로 분석되었다.

Keywords

References

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