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Classification of Ground Subsidence Factors for Prediction of Ground Subsidence Risk (GSR)

굴착공사 중 지반함몰 위험예측을 위한 지반함몰인자 분류

  • Park, Jin Young (Korea National Oil Corporation) ;
  • Jang, Eugene (Department of Geotechnical Disaster Prevention Engineering, Daejeon University) ;
  • Kim, Hak Joon (Department of Geotechnical Disaster Prevention Engineering, Daejeon University) ;
  • Ihm, Myeong Hyeok (Department of Geotechnical Disaster Prevention Engineering, Daejeon University)
  • 박진영 (한국석유공사) ;
  • 장유진 (대전대학교 건설안전방재공학과) ;
  • 김학준 (대전대학교 건설안전방재공학과) ;
  • 임명혁 (대전대학교 건설안전방재공학과)
  • Received : 2017.05.30
  • Accepted : 2017.06.19
  • Published : 2017.06.30

Abstract

The geological factors for causing ground subsidence are very diverse. It can be affected by any geological or extrinsic influences, and even within the same geological factor, the soil depression impact factor can be determined by different physical properties. As a result of reviewing a large number of papers and case histories, it can be seen that there are seven categories of ground subsidence factors. The depth and thickness of the overburden can affect the subsidence depending on the existence of the cavity, whereas the depth and orientation of the boundary between soil and rock are dominant factors in the ground composed of soil and rock. In case of soil layers, more various influencing factors exist such as type of soil, shear strength, relative density and degree of compaction, dry unit weight, water content, and liquid limit. The type of rock, distance from the main fracture and RQD can be influential factors in the bedrock. When approaching from the hydrogeological point of view, the rainfall intensity, the distance and the depth from the main channel, the coefficient of permeability and fluctuation of ground water level can influence to ground subsidence. It is also possible that the ground subsidence can be affected by external factors such as the depth of excavation and distance from the earth retaining wall, groundwater treatment methods at excavation work, and existence of artificial facilities such as sewer pipes. It is estimated that to evaluate the ground subsidence factor during the construction of underground structures in urban areas will be essential. It is expected that ground subsidence factors examined in this study will contribute for the reliable evaluation of the ground subsidence risk.

지반 함몰 위험성에 대한 지질학적 인자는 매우 다양하다. 어떠한 지질학적 요인 또는 외부적인 영향에 의해 영향을 받을 수 있으며 동일한 지질학적 요인 내에서도 여러 가지 다른 물성값에 의해 지반함몰 영향인자가 결정될 수 있다. 다수의 논문 및 연구사례를 검토 한 결과 크게 7가지 범주의 지반함몰 요인이 있음을 알 수 있었다. 공동의 존재 여부에 따라 상재하중의 심도 및 두께가 지반침하에 영향을 줄 수 있고, 토사와 암반으로 구성된 지반에서는 그 경계면의 심도와 배향이 지배적 요소이다. 이 중 토사지반에서는 좀 더 다양한 영향인자로 구성이 되어있는데 토사의 종류, 전단강도, 상대밀도 및 다짐도, 건조단위중량, 함수비, 액성한계가 그것이다. 암반지반에서는 암석의 종류와 주 단열과의 거리 및 RQD가 영향인자로 구성될 수 있으며 수리지질학적 측면에서 접근했을 경우 강우 강도, 하천과의 거리와 심도, 투수계수 및 지하수위 변동이 영향을 줄 수 있다. 외부적인 요소도 지반함몰에 영향을 줄 수 있는데 굴착심도와 흙막이 벽과의 거리, 굴착공사 시 지하수 처리공법, 하수관로 등 인공시설물 존재 유무 등이 이에 해당된다. 최근 도심지의 지하구조물 건설에서 지반함몰 요소를 평가하는 것은 필수적일 것으로 예상된다. 본 연구에서 분석한 지반함몰 영향인자가 지반함몰위험 평가에 도움이 되기를 기대한다.

Keywords

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