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2016 Vol.32, Issue 10 Preview Page
Investigation of the Change of Soil Arch Structure in Model Particle Assembly Subjected to Displacing Trapdoor via Photoelastic Measurement Technique

트랩도어 하강이 일어나는 모형 입자 입상체에서 광탄성 측정 기법을 이용한 흙 아치 구조의 변화 조사

Sang-Young Shin1
,
Young-Hoon Jung2
,
Taesik Kim3*
신 상영1
,
정 영훈2
,
김 태식3*
1Member, Graduate Student, Dept. of Civil Eng., Kyung Hee Univ.
2Member, Associate Prof., Dept. of Civil Eng., Kyung Hee Univ.
3Member, Assistant Prof., Dept. of Civil Eng., Hongik Univ.
1정회원, 경희대학교 사회기반시스템공학과 석사과정
2정회원, 경희대학교 사회기반시스템공학과 부교수
3정회원, 홍익대학교 토목공학과 조교수
*교신저자. *Corresponding Author. 
31 October 2016. pp. 31-40
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Abstract

In order to investigate the change in soil arch structure developed within the soil subjected to trapdoor movement, various responses in the deformed particle assembly were observed via photoelastic measurement technique. The particle assembly was composed of the regularly stacked model particles coated by thin photoelastic material. Variation of the internal structure transmitting contact forces were observed by taking images showing the photoelastic responses and compared with the change in slip lines and pressures measured by load cells placed beneath the assembly. Initial soil arch structure established immediately after the trapdoor movement collapsed progressively and meanwhile a new extended structure was developed against further movement of the trapdoor. For the sufficient movement of the trapdoor, initially identical regions bounded by the soil arch structure and slip lines were separated and the region enclosed by slip lines became a part of the region loosing the transmitting contact forces identified by photoelastic measurement.

Keywords
Trapdoor test
Soil arch
Contact force
Photoelastic measurement
Particle assembly

트랩도어 하강이 일어나는 토체 내부에서 발생하는 흙 아치 구조의 변화를 관찰하기 위해서 광탄성 측정 기법을 이용하여 입상체의 다양한 거동을 관찰하였다. 광탄성 반응 재료로 코팅된 원주형 모형 입자를 적층하여 입상체를 구성하였다. 광탄성 기법을 이용하여 입상체 내부에서 발생하는 입자 간 접촉력 전달 구조의 변화를 촬영하여 관찰하였으며 이를 입상체 하부 로드셀에서 측정된 압력 변화 및 내부 활동면의 변화 양상과 비교 분석하였다. 트랩도어 하강 초기에 형성된 흙 아치 구조는 하강이 지속되면 붕괴되지만 다시 확장된 아치 구조가 새롭게 형성되었다. 트랩도어 하강 초기에 일치하였던 흙 아치 구조의 경계면과 활동면은 트랩도어 하강이 진행되면서 활동면이 포함된 영역이 접촉력을 잃은 영역 내부에 포함되었다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 32
  • No :10
  • Pages :31-40
  • Received Date : 2016-07-01
  • Revised Date : 2016-08-22
  • Accepted Date : 2016-09-13
  • DOI :https://doi.org/10.7843/kgs.2016.32.10.31
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