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Physical Modeling of Group Pile Response to Liquefaction-Induced Lateral Spreading by Shaking Table Tests

Asefzadeh, Arian | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41450 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Haeri, Mohsen
  7. Abstract:
  8. In recent earthquakes piles have been severely damaged due to liquefaction-induced lateral spreading. Liquefaction causes lateral spreading in gently sloped saturated soft granular soils, leading to significant damage in structures and deep foundations. Although in recent years many studies have focused on different aspects of this phenomenon, the complex nature of the dynamic interaction between piles and liquefied soil is not yet fully understood. Thus more studies in this regard is inevitable. The present research focuses on the discussion and analysis of two large scale shaking table tests of 2x2 and 3x3 group piles. A three layer soil profile was used for the model, consisting of one liquefiable loose sand layer with a relative density of about 8% located between two non-liquefiable layers. The slope of the soil layers was about 7% and a sinusoidal input motion record with a 3 Hz frequency and a peak acceleration of 0.3g was used. The behavior of the soil and the piles was carefully recorded using a series of accelerometers, pore water pressure transducers, LVDTs and strain gauges. The results were analyzed, and among other results discussed in this research, indicated a decrease in acceleration levels in the liquefiable layer after liquefaction, a difference in between the pore water presser around the piles and in the free field of the model, the effect of non-liquefiable layers on the bending moments and soil pressure of the piles, and the effect of the relative velocity between the soil and the piles on the location of the maximum bending moment on the pile.
  9. Keywords:
  10. Liquefaction ; Pile Group ; Shaking Table ; Physical Model ; Soil Pressure ; Bending Moment ; Lateral Spread ; Excess Pore Water Pressure

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