Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
권호 표지
DOI QR코드

DOI QR Code

Estimation of Ultimate Lateral Load Capacity Using CPT Results Considering Lateral Soil Pressure Distribution

수평토압분포를 고려한 CPT 기반의 말뚝극한수평지지력 산정

  • Published : 2009.02.28
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, estimation methodology for the pile of ultimation lateral resistance, pu, and ultimate lateral capacity, Pu, is based on the CPT cone resistance $q_c$. Preexistent methodologies for ultimate lateral resistance and ultimate lateral capacity have been generally represented with relative density, vertical effective stresses, and various $K_0$ values which are important for analyzing sandy soil. These methodologies, however, did not consider the horizontal effective stress and the effects of construction site conditions. Therefore, CPT-based methodology for the estimation of the ultimate lateral pile load capacity Hu was proposed. Calibration chamber test results were analyzed and compared with calculated results. The proposed estimation methodology for the pile of $p_u$ can be effectively utilized as alternative to preexistent methods.

본 연구에서는 대표적인 원위치현장시험인 CPT의 콘관입치 $q_c$ 값을 이용하여 말뚝의 극한수평단위지지력과 극한수평지지력을 산정하는 예측식들을 제안하고, 검증하였다. 일반적으로 기존 극한수평단위지지력과 극한수평지지력은 사질토지반에서 중요한 요소인 상대밀도, 연직응력, 그리고 다양한 토압계수들에 대한 함수로 표현하여 왔다. 하지만 이들은 수평음력에 대한 영향을 고려하지 않았으며, 말뚝 주변지반이 단 일층으로 구성되어 있다고 가정하여 실제 현장에서의 영향을 고려하지 않았다. 따라서 본 연구에서는 이에 대한 영향을 고려할 수 있는 CPT 결과를 이용한 극한수평단위지지력 산정식과 극한수평지지력을 산정하는 방법을 제안하였다. 이는 순수사질토에 대상으로 하고 있으며, 그에 대한 해석을 위해 적합한 대상지반을 대상으로 제안된 산정식의 신뢰성을 확보하였다.

Keywords

References

  1. 김민기, 경두현, 홍정무, 이준환 (2008), "사질토지반에서 콘관입 저항치 qc에 의한 단말뚝의 극한수평단위지지력 평가", 한국지반공학회논문집(11월 게재확정)
  2. 이준환, 백규호, 김대홍, 김민기, 황성욱 (2007), "응력상태를 고려한 사질토지반에 관입된 말뚝의 극한수평지지력 분석 및 평가", 한국지반공학회논문집, 제23권, 제4호, pp.161-167
  3. Barton, Y. O. (1982), "Laterally loaded model piles in sand: Centrifuge tests and finite element analyses", Ph.D. Thesis, University of Cambridge
  4. Brinch Hansen, J. (1961), "The ultimate resistance of rigid piles against transversal forces", Danish Geotechnical Institute, Copenhagen, Bulletin No.12, pp.5-9
  5. Broms, B. B. (1964), "Lateral resistance of piles in cohesive soils", Journal of Soil Mechanics and Foundation Division, ASCE, Vol.90, No.2, pp.27-64
  6. Chari, T. R., and Meyerhof, G. G. (1983), "Ultimate capacity of rigid piles under inclined load in sand", Canadian Geotechnical J., 18(2), pp.849-854
  7. Fleming, W. G., Weltman, A. J, Randolph, M. F., and Elson, W.K.(1992), "Piling Engineering", 2nd ed. John Wiley and Sons, Inc
  8. Jaky, J. (1944), "The coefficient of earth pressure at rest", Journal of the Society of Hungarian Archtects and Engineers, pp.355-358
  9. Kyle, M. R., Ryan, J. O., Jeffery, J. E., Derek, H.J., Kimball, G. O., and Brian, H. G. (2006), "Pile spacing effects on lateral pile group behavior: Load tests", Journal of Geotechnical and Geoenvironmental Engineering, Vol.132, No.10, pp.1262-1271 https://doi.org/10.1061/(ASCE)1090-0241(2006)132:10(1262)
  10. Meyerhof, G. G., and Sastry, V.V.R.N. (1985). "Bearing capacity of rigid piles under eccentric and included loads", Canadian Geotechnical J., 22(3), pp.267-275 https://doi.org/10.1139/t85-040
  11. Meyerhof, G. G., and Sastry, V.V.R.N. (1987), "Full-displacement pressuremeter method for rigid piles under lateral loads and moments", Canadian Geotechnical J., 24(4), pp.471-478 https://doi.org/10.1139/t87-063
  12. Mitchell, J. K. (1993), "Fundmentals of soil behavior", John Wiley & Sons, Inc., New York, New York
  13. Park, Y. S. (2006), "Estimation of load bearing capacity of single pole foundation for transmission structure in sand", Univ. of Yonsei, Seoul
  14. Petrasovits, G., and Award, A. (1972), "Ultimate lateral resistance of a rigid pile in cohesionless soil", Proc. Of 5th European Conf. on SMFE, Vol.3, pp.407-412
  15. Prasad, Y. V. S., and Chari, T. R. (1999), "Lateral capacity of model rigid piles in cohesionless soils", Soils and Foundations, Vol.39, No.2, pp.21-29 https://doi.org/10.3208/sandf.39.2_21
  16. Reese, L. C., Cox, W. R., and Koop, F. D. (1974), "Analysis of laterally loaded piles in sand", Proc. of 6th Offshore Technology Conf. Vol.2, pp.473-483 https://doi.org/10.4043/2080-MS
  17. Salgado, R. (1993), "Analysis of penetration resistance in sands", Ph.D. thesis, Univ. of California, Berkeley, California
  18. Salgado, R., Mitchell, J. K., and Jamiolkowski, M. (1997), "Cavity Expansion and penetration resistance in sand", Journal of Geotechnical and Geoenvironmental Eng., ASCE, Vol.123, No.4, pp.344-354 https://doi.org/10.1061/(ASCE)1090-0241(1997)123:4(344)
  19. Sherif, M. A., Fang, Y. S., and Sherif, R. I. (1984), "KA and K0 behind rotating and Non-yielding walls", Journal of Geotechnical Engineering, ASCE, Vol.110, No.GT1, pp.41-56 https://doi.org/10.1061/(ASCE)0733-9410(1984)110:1(41)
  20. Vesic, A. S. (1972), "Expansion of cavities in infinite soil mass", Journal of the Soil Mechanics and Foundarions Division, Proc. the American Society of Civil Engineers, Vol.98, No.SM3, pp.265-290
  21. Zhang, L., Silva, F., and Grismala, R. (2005), "Ultimate lateral resistance to pile in cohesionless soils", Journal of Geotechnical and Geoenvironmental Eng., ASCE, Vol.131, No.1, pp.78-83 https://doi.org/10.1061/(ASCE)1090-0241(2005)131:1(78)