한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제39권4호
  • /
  • Pages.19-29
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  • 2023
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  • 1229-2427(pISSN)
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  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
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풍화토-그라우트 인터페이스 전단 거동 특성에 대한 실험적 연구

Experimental Study on the Residual Soil-Grout Interface-shearing Behavior

  • 신규범 (서울대학교 BK21 인프라스피어 교육연구단 ) ;
  • 정충기 (서울대학교 건설환경공학부 ) ;
  • 김인현 (서울대학교 건설환경공학부 ) ;
  • 조범희 (서울대학교 건설환경공학부 )
  • Shin, Gyu-Beom (BK21, Education & Research Program for InfraSPHERE, Seoul National Univ.) ;
  • Chung, Choong-Ki (Dept. of Civil and Environmental Engineering, Seoul National Univ.) ;
  • Kim, Inhyun (Dept. of Civil and Environmental Engineering, Seoul National Univ.) ;
  • Jo, Bum-Hee (Dept. of Civil and Environmental Engineering, Seoul National Univ.)
  • 투고 : 2023.03.14
  • 심사 : 2023.03.21
  • 발행 : 2023.04.30
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초록

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.

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.

키워드

과제정보

본 연구는 한국연구재단(No. 2020R1A2C2010771) 및 서울대학교 공학연구원의 지원을 받아 수행된 연구입니다. 이에 깊은 감사를 드립니다.

참고문헌

  1. ASTM-D3080/D3080M (2011), Standard test method for direct shear test of soils under consolidated drained conditions, Annual Book of ASTM Standards, ASTM, West Conshohocken, PA. 
  2. Barley, A. D. (1997), The single bore multiple anchor system. In Ground anchorages and anchored structures: Proceedings of the international conference organized by the Institution of Civil Engineers and held in London, UK, on 20-21 March 1997 (pp. 65-75). Thomas Telford Publishing. 
  3. Briaud, J. L., III, W. F. P., and Weatherby, D. E. (1998), Should Grouted Anchors Have Short Tendon Bond Length?, Journal of geotechnical and geoenvironmental engineering, Vol.124, No.2, pp.110-119.  https://doi.org/10.1061/(ASCE)1090-0241(1998)124:2(110)
  4. British Standards Institution (2015), BS 8081: 2015: Code of practice for grouted anchors. 
  5. Chu, L. M. and Yin, J. H. (2005), Comparison of Interface Shear Strength of Soil Nails Measured by Both Direct Shear Box Tests and Pullout Tests, Journal of geotechnical and geoenvironmental engineering, Vol.131, No.9, pp.1097-1107.  https://doi.org/10.1061/(ASCE)1090-0241(2005)131:9(1097)
  6. Desai, C. S. and Zaman, M. (2013), Advanced geotechnical engineering: Soil-structure interaction using computer and material models. CRC Press. 
  7. Hossain, M. A. and Yin, J. H. (2012), Influence of Grouting Pressure on the behavior of an Unsaturated Soil-cement Interface, Journal of geotechnical and geoenvironmental engineering, Vol.138, No.2, pp.193-202.  https://doi.org/10.1061/(ASCE)GT.1943-5606.0000585
  8. Hossain, M. A. and Yin, J. H. (2014), Behavior of a Pressure-grouted Soil-cement Interface in Direct Shear Tests, International Journal of Geomechanics, Vol.14, No.1, pp.101-109.  https://doi.org/10.1061/(ASCE)GM.1943-5622.0000301
  9. Hossain, M. A. and Yin, J. H. (2015), Dilatancy and Strength of an Unsaturated Soil-cement Interface in Direct Shear Tests, International journal of Geomechanics, Vol.15, No.5, 04014081. 
  10. Jeong, H. S., Han, K. S., and Lee, Y. S. (2017), Numerical Study on the Skin Friction Characteristics of Tension Type Ground Anchors in Weathered Soil, Journal of the Korean Geotechnical Society, Vol.33, No.1, pp.39-56.  https://doi.org/10.7843/KGS.2017.33.1.39
  11. Kim, B. C., Jeong, S. S., and Ko, J. Y. (2015), Proposed Reduction Factor of Cyclic p-y Curves for Drilled Shafts in Weathered Soil, Journal of the Korean Geotechnical Society, Vol.31, No.2, pp.47-63.  https://doi.org/10.7843/KGS.2015.31.2.47
  12. Kim, N. K. (2001), Load Transfer of Tension and Compression Anchors in Weathered Soil, Journal of the Korean Geotechnical Society, Vol.17, No.3, pp.59-68. 
  13. Kishida, H. and Uesugi, M. (1987), Tests of the Interface between Sand and Steel in the Simple Shear Apparatus, Geotechnique, Vol.37, No.1, pp.45-52.  https://doi.org/10.1680/geot.1987.37.1.45
  14. Ministry of Land, Infrastructure and Transport (2021), Ground Anchor Design.Construction and Maintenance Manual, In Korean.
  15. Moayed, R. Z., Hosseinali, M., Shirkhorshidi, S. M., and Sheibani, J. (2019), Experimental Investigation and Constitutive Modeling of Grout-sand Interface, International Journal of Geomechanics, Vol.19, No.5, 04019024. 
  16. Ostermayer, H. and Scheele, F. (1978), Research on Ground Anchors in Non-cohesive Soils, Revue Francaise de Geotechnique, (3), pp.92-97. 
  17. Park C. (1995), Charateristic of weathered residual soil. 
  18. Sabatini, P. J., Pass, D. G., and Bachus, R. C. (1999), Geotechnical engineering circular no. 4: Ground anchors and anchored systems. (No. FHWA-IF-99-015). 
  19. Subba Rao, K. S., Allam, M. M., and Robinson, R. G. (2000), Drained Shear Strength of Fine-grained Soil-solid Surface Interfaces, Proceedings of the Institution of Civil Engineers-Geotechnical Engineering, Vol.143, No.2, pp.75-81.  https://doi.org/10.1680/geng.2000.143.2.75
  20. Toufigh, V., Masoud Shirkhorshidi, S., and Hosseinali, M. (2017), Experimental Investigation and Constitutive Modeling of Polymer Concrete and Sand Interface, International Journal of Geomechanics, No.17, No.1, 04016043. 
  21. Vukotic, G., Gonzalez Galindo, J., and Soriano, A. (2013), The Influence of Bond Stress Distribution on Ground Anchor Fixed Length Design. Field Trial Results and Proposal for Design Methodology. In Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, France (pp.2-6). 
  22. Zhu, S., Chen, C., Mao, F., and Cai, H. (2021), Application of Disturbed State Concept for Load-transfer Modeling of Recoverable Anchors in Layer Soils, Computers and Geotechnics, 137, 104292.