DOI QR코드

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Time dependent behavior of piled raft foundation in clayey soil

  • Fattah, Mohammed Y. (Building and Construction Engineering Department, University of Technology) ;
  • Al-Mosawi, Mosa J. (College of Engineering, Civil Engineering Department, University of Baghdad) ;
  • Al-Zayadi, Abbas A.O. (College of Engineering, Civil Engineering Department, University of Baghdad)
  • 투고 : 2012.02.25
  • 심사 : 2012.10.06
  • 발행 : 2013.02.25

초록

Settlement of the piled raft can be estimated even after years of completing the construction of any structure over the foundation. This study is devoted to carry out numerical analysis by the finite element method of the consolidation settlement of piled rafts over clayey soils and detecting the dissipation of excess pore water pressure and its effect on bearing capacity of piled raft foundations. The ABAQUS computer program is used as a finite element tool and the soil is represented by the modified Drucker-Prager/cap model. Five different configurations of pile groups are simulated in the finite element analysis. It was found that the settlement beneath the piled raft foundation resulted from the dissipation of excess pore water pressure considerably affects the final settlement of the foundation, and enough attention should be paid to settlement variation with time. The settlement behavior of unpiled raft shows bowl shaped settlement profile with maximum at the center. The degree of curvature of the raft under vertical load increases with the decrease of the raft thickness. For the same vertical load, the differential settlement of raft of ($10{\times}10m$) size decreases by more than 90% when the raft thickness increased from 0.75 m to 1.5 m. The average load carried by piles depends on the number of piles in the group. The groups of ($2{\times}1$, $3{\times}1$, $2{\times}2$, $3{\times}2$, and $3{\times}3$) piles were found to carry about 24%, 32%, 42%, 58%, and 79% of the total vertical load. The distribution of load between piles becomes more uniform with the increase of raft thickness.

키워드

참고문헌

  1. ABAQUS Theory Manual, version, (2008), Hibbitt, Karlsson & Sorenson, Inc.
  2. Al- Saady, N.H. (1989), "Analysis of an A-6 soil during construction of a road embankment", M.Sc. thesis, University of Baghdad, Iraq.
  3. Al-Zayadi, A.A.O. (2010), "Three-dimensional analysis of piled-raft foundation", Ph.D. Thesis, University of Baghdad, Iraq.
  4. Chow H. (2007), "Analysis of piled-raft foundation with piles of different lengths and diameters", Ph.D. Thesis, School of Civil Engineering, the University of Sydney.
  5. Russo, G. and Viggiani, C. (1998), "Factors controlling soil-structure interaction for piled Rafts", Darmstadt Geotechnics, Darmstadt University of Technology, 4, 297-322.
  6. Small, J.C. and Liu, L.S. (2008), "Time-settlement behaviour of piled raft foundations using infinite elements", Comput. Geotech., 35, 187-195. https://doi.org/10.1016/j.compgeo.2007.04.004

피인용 문헌

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  2. Optimum pile arrangement in piled raft foundation by using simplified settlement analysis and adaptive step-length algorithm vol.5, pp.6, 2013, https://doi.org/10.12989/gae.2013.5.6.519
  3. A simulation-based determination of cap parameters of the modified Drucker–Prager cap model by considering specimen barreling during conventional triaxial testing vol.100, 2015, https://doi.org/10.1016/j.commatsci.2014.10.024
  4. Artificial intelligence design charts for predicting friction capacity of driven pile in clay pp.1433-3058, 2019, https://doi.org/10.1007/s00521-018-3555-5
  5. Design and Improvement of foundation soil for high-rise construction vol.170, pp.None, 2013, https://doi.org/10.1051/matecconf/201817003001
  6. Assessment the effect of pile intervals on settlement and bending moment raft analysis of piled raft foundations vol.16, pp.2, 2013, https://doi.org/10.12989/gae.2018.16.2.187
  7. Numerical and Theoretical Study on the Settlement of Capped Piles Composite Foundation under Embankment vol.2020, pp.None, 2013, https://doi.org/10.1155/2020/3978780
  8. Long-term behavior of piled raft foundation models supported by jacked-in piles on saturated clay vol.60, pp.1, 2013, https://doi.org/10.1016/j.sandf.2020.02.005
  9. Ratio of long-term settlement to immediate settlement for piled raft on soft clay vol.173, pp.4, 2013, https://doi.org/10.1680/jgrim.18.00048
  10. Measurements and analysis of load sharing between piles and raft in a pile foundation in clay vol.24, pp.6, 2021, https://doi.org/10.12989/gae.2021.24.6.559
  11. Prediction of Piled Raft Settlement Using Soil Subgrade Modulus in Consolidating Clays vol.26, pp.4, 2013, https://doi.org/10.1061/(asce)sc.1943-5576.0000608