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2023 Vol.39, Issue 4 Preview Page
Experimental Study on the Residual Soil-Grout Interface-shearing Behavior

풍화토-그라우트 인터페이스 전단 거동 특성에 대한 실험적 연구

Gyu-Beom Shin1
,
Choong-Ki Chung2
,
Inhyun Kim3
,
Bum-Hee Jo4*
신 규범1
,
정 충기2
,
김 인현3
,
조 범희4*
1Member, Researcher, BK21, Education & Research Program for InfraSPHERE, Seoul National Univ.
2Member, Prof., Dept. of Civil and Environmental Engineering, Seoul National Univ.
3Member, Ph. D Student, Dept. of Civil and Environmental Engineering, Seoul National Univ.
4Member, Ph. D Student, Dept. of Civil and Environmental Engineering, Seoul National Univ.
1정회원, 서울대학교 BK21 인프라스피어 교육연구단 연수연구원
2정회원, 서울대학교 건설환경공학부 교수
3정회원, 서울대학교 건설환경공학부 박사과정
4정회원, 서울대학교 건설환경공학부 박사과정
*Corresponding Author
30 April 2023. pp. 19-29
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Abstract

This research proposes a direct shear test method to evaluate the behavior of the soil-grout interface. The proposed test method was employed to conduct direct shear tests on two types of specimens: residual soil and residual soil-grout. The evaluation of the shear stress-slip curve indicated that the residual shear strength of residual soil-grout was similar to that of residual soil. It was further confirmed that residual soil determines the behavior of the critical state of the residual soil-grout interface. However, a remarkable increase in the maximum shear strength at the residual soil-grout interface was observed. The increase rate of the maximum shear strength was higher in loose soil due to the increased thickness of the interface layer where residual soil particles and grout particles are mixed.

Keywords
Direct shear test
Soil-grout interface
Residual soil
Shear strength

본 연구에는 지반-그라우트 인터페이스 거동을 평가하기 위한 직접전단시험 장비를 제작하였으며, 제작된 시험 장비를 통해 풍화토, 풍화토-그라우트 두 종류의 시료에 대해 직접전단시험을 수행하였다. 전단응력-슬립 곡선 평가 결과 풍화토-그라우트의 잔류 전단 강도는 단일 풍화토의 잔류 전단 강도와 유사한 값을 나타냈으며, 풍화토-그라우트 인터페이스의 한계 상태 거동은 풍화토에 의해 결정된다는 것을 확인했다. 그러나, 최대 전단 강도의 경우 풍화토-그라우트 인터페이스에서 매우 크게 증가하는 것으로 나타났다. 최대 전단 강도의 증가율은 느슨한 지반에서 더 크게 발생하는 것으로 나타났으며, 이는 풍화토 입자와 그라우트 입자가 섞여 있는 인터페이스 레이어의 두께가 증가했기 때문으로 보인다.

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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 : 39
  • No :4
  • Pages :19-29
  • Received Date : 2023-03-14
  • Revised Date : 2023-03-20
  • Accepted Date : 2023-03-21
  • DOI :https://doi.org/10.7843/kgs.2023.39.4.19
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