[논문]준설점토가 상부에 매립된 대심도 연약지반 계측관리

정나영; 강승찬; 김태형

doi:10.7843/kgs.2022.38.12.67

준설점토가 상부에 매립된 대심도 연약지반 계측관리
Instrumentation Management of the Deep Soft Ground with Dredged Clay Reclaimed in the Upper 원문보기

韓國地盤工學會論文集 = Journal of the Korean geotechnical society, v.38 no.12, 2022년, pp.67 - 78

정나영 (한국해양대학교) , 강승찬 ((주)광림엔지니어링) , 김태형 (한국해양대학교 건설공학전공)

초록
AI-Helper

본 연구에서는 준설점토가 상부에 매립된 해안가 대심도 연약지반의 계측결과를 분석하고 현재의 시방기준과 비교하여 그 결과를 바탕으로 대심도 연약지반 개량공사에 사용되는 각 계측별 계측기 선정, 설치, 데이터 정리 및 분석에 대하여 적합한 안을 제안하였다. 간극수압계의 경우, 연약지반 현장 여건을 고려하여 예상 가능한 측정 범위의 1.5배 이상 정도의 계측 범위가 가능한 게이지를 적용하는 것이 바람직하다. 수평배수층에 설치되는 지하수위계는 성토 중 지하수위의 변화, 집수정 및 수평배수층의 성능을 확인하는 것으로 성토 중에는 지하수위가 수평배수층 내부에 존재하도록 관리하는 것이 중요하다. 대심도 연약지반에서 지중경사계의 설치심도는 N치가 40 이상인 풍화암 또는 연약지반 하부의 자갈층에 설치하면 충분하다. 층별침하계는 스크류타입을 설치하는 것이 바람직해 보인다. 그러나 스크류타입 게이지가 자중에 의한 침하가 발생하지 않아야 한다. 폐합 또는 결합측량시 수준측량의 허용오차는 침하가 크게 발생하는 준설매립지임을 고려하면 $\sqrt[10]{L}mm$(L은 편도거리(km)) 정도로 관리하면 충분하다.

Abstract ▼ AI-Helper

In this study, the measurement results of the coastal deep soft ground buried in the upper part of the dredged clay were analyzed and compared with the current specification standards. Based on the results, a suitable proposal was suggested for the selection, installation, data arrangement, and analysis of each instrument used in the deep soft ground improvement construction. The pore water pressure meter has a range of 1.5 times or more of the expected measurement range, considering the field conditions of the soft ground. The groundwater level meter installed in the horizontal drainage layer checks the change in the groundwater level during the embanking as well as the performance of the catchment well and the horizontal drainage layer. Therefore, it is important to manage so that the groundwater level exists inside the horizontal drainage layer during embanking. It is enough to install the inclinometer in the gravel layer below the soft ground or weathered rock with an N value of 40 or more for the deep soft ground. It seems desirable to install a screw type for differential settlement meter. However, the screw type should not settle due to its own weight. Considering that it is a dredged landfill where subsidence occurs significantly, it is sufficient to manage the tolerance of leveling at about 10 mm (L is the one-way distance (km)).

주제어

표/그림 (12)

그림 Fig. 1. Examples of pore water pressure measurement
표 Table 1. Type and measurement range of pore water pressure gauges applied to each site of Busan Port New Port
그림 Fig. 2. Groundwater level mesurement results in the upper and lower sand layers of soft ground (○○ site)
그림 Fig. 3. Groundwater level measurement results at upper permeable layer of the clay layer (Ungdong hinterland)
그림 Fig. 4. Groundwater level measurement results at lower permeable layer of the clay layer (○○ site)
그림 Fig. 5. Cases of groundwater level management during soft ground improvement (Ungdong hinterland)
그림 Fig. 6. Cross-sectional view of the installation of a inclinometer during soft ground improvement
그림 Fig. 7. Comparison of settlements of surface settlement plate and differential settlement meter (magnetic type) installed at the same point
그림 Fig. 8. Causes of under settlement in the differential settlement meter (magnetic type)
표 Table 2. Type of multi-layer settlement gauges applied to each site of Busan Port New Port
그림 Fig. 9. The magnitude of the final settlement prediction range according to the error (Kang, 2012)
표 Table 3. Leveling tolerances

참고문헌 (23)

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상세보기
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