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Research Article

A Study for Characterization on Shallow Behavior of Soil Slope by Flume Experiments

토조실험 장치를 이용한 토사비탈면 표층거동 특성 연구

Jae-wook Suk1
,
Sung-Yong Park2*
,
Geon-ha Na2
,
Hyo-Sub Kang1
석 재욱1
,
박 성용2*
,
나 건하2
,
강 효섭1
1Disaster Prevention Research Division, National Disaster Management Research Institute, Senior Researcher
2Disaster Prevention Research Division, National Disaster Management Research Institute, Researcher
1국립재난안전연구원 방재연구실 지반재난실험팀, 시설연구사
2국립재난안전연구원 방재연구실 지반재난실험팀, 연구원
* Corresponding Author
30 September 2018. pp. 489-499
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Abstract

A flume experiments was used to study the characteristics of the surface displacements and volumetric water contents (VWC) during torrential rain. The surface displacement and VWC of the granite weathered soil were measured for rainfall intensity (100, 200 mm/hr) and initial ground condition (VWC 7, 14, 26%). The test processes were also recorded by video cameras. According to the test results, The shallow failure is classified into three types: retrogressive failure, progressive failure and defined failure. In the case of retrogressive failure and progressive failure, relatively large damage could occur due to the feature that soil is deposited to the bottom of the slope. the shallow failure occurred when the VWC reached a certain value regardless of the initial soil condition. It was found that the shallow failure can be predicted through the increase patton of the VWC under the condition of the ground dry condition (VWC 7%) and the natural condition (VWC 14%). For high rainfall intensity, progressive failure predominated, and rainfall intensity above a certain level did not affect wetting front transition.

Keywords
steep slope
flume test
shallow failure
surface displacement
water volumetric content

본 연구에서는 급경사지 모형토조 실험을 통해 집중강우에 의한 표층거동 특성 및 체적함수비 변화 특성을 분석하였다. 화강암 풍화토를 대상으로 강우강도(100, 200 mm/hr) 및 초기 지반상태(VWC 7, 14, 26%) 조건에 대한 지표변위 및 체적함수비를 측정하고 영상분석을 위해 실험 전 과정을 비디오 카메라로 촬영하였다. 실험결과 표층붕괴는 후퇴성 붕괴, 전진형 붕괴, 국지적 붕괴의 세가지 형태가 주를 이루며, 후퇴성 붕괴와 전진형 붕괴의 경우 토사가 비탈면 하부까지 퇴적되는 특징으로 인해 상대적으로 큰 피해가 발생할 수 있는 것으로 나타났다. 체적함수비는 초기 조건에 관계없이 일정한 값에서 붕괴가 발생하였으며 건기 시의 지반 조건과 자연상태 조건에서는 체적함수비 증가양상을 통해 표층붕괴를 예측가능한 것으로 나타났다. 강우강도가 큰 경우에 전진형 붕괴가 우세하였으며, 일정 수준이상의 강우강도는 습윤전선 전이에 영향을 미치지 않은 것으로 나타났다.

키워드
급경사지
토조실험
표층붕괴
표면변위
체적함수비
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 28
  • No :3
  • Pages :489-499
  • Received Date : 2018-09-06
  • Revised Date : 2018-09-11
  • Accepted Date : 2018-09-17
  • DOI :https://doi.org/10.9720/kseg.2018.3.489
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