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2025 Vol.41, Issue 4 Preview Page
Effect of Fine Content and Temperature on the Direct Shear Behavior of Weathered Granite Soil

온도 및 세립분 함량에 따른 화강풍화토의 직접전단 거동 특성

Ju-Won Ryu1
,
Hanh Nguyen-Cong2
,
Yong-Chai Chang3
,
Young-Sang Kim4*
류 주원1
,
응우옌콩 한2
,
장 용채3
,
김 영상4*
1Member, Graduate Student, Dept. of Architecture and Civil Engineering, Chonnam National Univ.
2Member, Graduate Student, Dept. of Architecture and Civil Engineering, Chonnam National Univ.
3Member, Prof., Dept. of Ocean Civil Engineering, Mokpo National Maritime Univ.
4Member, Prof., Dept. of Civil Engineering, Chonnam National Univ.
1정회원, 전남대학교 일반대학원 건축토목공학과
2정회원, 전남대학교 일반대학원 건축토목공학과
3정회원, 국립목포해양대학교 해양건설공학과 교수
4정회원, 전남대학교 토목공학과 교수
*Corresponding Author
31 August 2025. pp. 185-201
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Abstract

This study investigates the effects of fine content and temperature variations caused by the operation of energy geostructures on the shear strength and volumetric change of weathered granite soil (WGS) under direct shear testing. A series of thermomechanical direct shear tests were performed by varying fines content (5%, 15%, 25%), moisture condition (dry, saturated), and temperature (20°C, 40°C, 60°C). A custom-designed thermal direct shear box, equipped with a water circulation system, was used to simulate realistic heat transfer mechanisms of ground heat exchangers. The experimental results showed that under dry conditions, temperature changes had negligible effects on shear strength, volumetric behavior, and internal friction angle. In contrast, under saturated conditions, increasing temperature significantly increased shear strength, dilative behavior, and internal friction angle. Furthermore, the internal friction angle tended to decrease with increasing fines content. Moreover, this study provides practical insights into the thermomechanical behavior of WGS under various field-relevant conditions and offers a design basis for energy geostructures applicable to domestic ground conditions.

Keywords
Direct shear test
Energy geo-structures
Shear strength characteristics
Thermal consolidation
Thermo-mechanical behavior
Weathered granite soil

본 연구에서는 에너지 지반구조물의 운영 시 인접한 지반 내에 발생시키는 온도 변화가 화강풍화토의 전단강도 및 전단 시 체적 거동 특성에 미치는 영향을 규명하고자 하였다. 이를 위해 세립분 함량(5%, 15%, 25%) 및 습윤 조건(건조, 포화), 온도(20°C, 40°C, 60°C)를 변수로 설정하고, 실제 에너지 지반구조물 내의 열전달 조건을 모사할 수 있도록 새롭게 제작한 물 순환식 온도 조절 직접전단박스를 이용하여 광주광역시 지역의 화강풍화토에 대한 열-역학적 직접전단시험을 수행하였다. 실험 결과, 건조 상태에서는 온도 변화가 화강풍화토의 전단강도 및 전단 시 체적 거동, 내부마찰각에 미치는 영향이 미미하였다. 반면, 포화 상태에서는 온도 상승에 따라 전단강도, 전단 시 체적 그리고 내부마찰각이 모두 증가하는 경향이 뚜렷하게 나타났다. 또한, 내부마찰각은 세립분 함량 증가에 따라 전반적으로 감소하는 경향을 보였다. 본 연구는 다양한 세립분 함량과 온도 조건을 동시에 고려한 화강풍화토의 전단 특성 평가를 통해, 국내 실정에 적합한 에너지 지반구조물 설계를 위한 기초 자료를 제공하고자 하였다.

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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 : 41
  • No :4
  • Pages :185-201
  • Received Date : 2025-08-04
  • Revised Date : 2025-08-15
  • Accepted Date : 2025-08-15
  • DOI :https://doi.org/10.7843/kgs.2025.41.4.185
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