Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
권호 표지
DOI QR코드

DOI QR Code

Modification of Bearing Capacity Formula Considering Seam Tensile Strength of Geotextile in Soft Ground

연약지반에 포설된 Geotextile 봉합인장강도를 고려한 지지력 수정방정식

  • 김선학 (산이건설(주)) ;
  • 채유미 (동신대학교 토목환경공학과) ;
  • 김재홍 (동신대학교 토목환경공학과)
  • Received : 2019.10.14
  • Accepted : 2019.12.08
  • Published : 2019.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

With the increasing use of geotextile mats in dredging and reclaiming work and coastal construction, the assessment of bearing capacity in soft ground has become an important evaluation index for negligent accidents. The review of the allowable bearing capacity of soft ground consisting of inhomogeneous layers by laying geotextile mats and sand mat layers for soft ground improvement is generally compared with the equation of Meyerhof (1974) and Yamanouchi (1985). Mayerhof formula results in economic loss due to underestimation of bearing capacity, and Yamanouchi (1985) formula does not take into account negligent accidents for punching shear failure, so rather high bearing capacity is evaluated. It is considered that economic feasibility and stability will be ensured by proposing a modified formula to calculate the appropriate bearing capacity by applying the seam tensile strength of the geotextile mat to the design standard of soft ground improvement.

최근 증가되고 있는 준설 및 매립지반의 해안 공사에서 토목섬유매트 활용이 많아짐에 따라 연약지반의 지지력에 대한 산정은 안전성 평가를 위한 중요한 지표이다. 지반 개량을 위해 토목섬유매트와 복토층을 포설하여 이질층으로 구성된 연약지반의 허용지지력 검토는 일반적으로 Meyerhof(1974)와 Yamanouchi(1985) 방정식을 비교한다. Meyerhof(1974) 수식 결과는 허용지지력의 과소평가로 경제적인 손실을 초래하며, Yamanouchi(1985) 수식은 펀칭전단파괴에 대한 안전사고를 고려하지 않아 다소 큰 지지력을 평가한다. 토목섬유매트의 봉합인장강도를 설계기준에 적용하여 적절한 허용지지력을 산정하는 수정방정식을 제안함으로서 경제성과 안정성을 확보할 것으로 판단된다.

Keywords

References

  1. An, B.W., Lim, D.Y, Lee, K.Y., Chung, C.G., and Jeon, H.Y. (2009), "Interpretation on Geogrids Junction and Tensile Behaviors by Finite Element Analysis", Textile Science and Engineering, 46(4), 239-244.
  2. Ju, J.W., Seo, K.W., and Jang, M.H. (2007), "Bearing Capacity of Soft Ground Reinforced by Geosynthetics and Sand Mat", Korean Geosynthetics Society, 2007(1), 1-7.
  3. Jeon, H.Y., Yuu, J.J., and Chang, Y.C. (2008), "Seaming Behaviors Interpretation of Geotextile Tube", Fall Geotechnical Engineering Conference, 2008, 1593-1603.
  4. Kim, J.M. (2003), "The Effect of Displacement Rate on Shear Characteristics of Geotextile-involved Geosynthetic Interfaces", Journal of Korean Geotechnical Society, 2003(19), 173-180.
  5. Kim, J.M. (2005), "Dynamic Frictional Properties of Geosynthetic Interfaces Involving Only Non-geotextiles", Journal of Korean Geotechnical Society, 2005(21), 81-90.
  6. Kim, S.I (2010), "Foundation Engineering", Kyobo book center, Seoul, pp.111-113.
  7. KAITA (2018), "Development of Sealing Technology and Efficient Installation Method for Increasing Joint Strength of Geotextile in Soft Ground", Korea Agency for Infrastructure Technology Advancement, R&D Report, 18RDRP-B076564-05, South Korea.
  8. Leshchinsky, D. (2004), "Design software for soft soils", Geotechnical Fabrics Report, March, 22(2), 18-23.
  9. Meyerhof, G.G. (1974), "Ultimate Bearing Capacity of Footings on Sand Layer Overlying Clay", Canadian Geotechnical Journal, 11(2), 224-229.
  10. Yamanouchil, T. (1985), "Recent development in the used synthetic geofabrics and geogrids", Symposium on Recent Developments in Ground improvement techniques, Bangkok, 205-224.
  11. Yuu, J.J., Oh, Y.I., and Jeon, H.Y. (2007), "A Comprehensive Consideration on the Seam Strength of Geotextile Tubes: (1) Failure behaviors and the Required Strength", Korean Geosynthetics Society, 2007(11), 241-246.
  12. Yuu, J.J., Oh, Y.I., and Jeon, H.Y. (2008), "A Comprehensivie Consideration on the Seam Strength of Geotextile Tubes: (2) Basics of the Stitching Seam", Korean Geosynthetics Society, 2008(4), 215-210.