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Studying the Effects of Liquefaction Induced Lateral Spreading on Piles and Evaluation of a Remedial Measure Against Pile Damaging Due to These Effects with Shake Table Tests Using Laminar Shear Box

Rajabigol, Morteza | 2023

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 56160 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Haeri, Mohsen; Kavand, Ali
  7. Abstract:
  8. Liquefaction-induced lateral spreading is one of the most challenging problems in geotechnical earthquake engineering. This phenomenon may impose severe damages on deep foundations in large earthquakes. In this study, six physical modeling are designed, built and tested to investigate the effects of lateral spreading on deep foundations and also assess one mitigation method. The experiments were conducted using 1g shake table of Sharif university of technology. In this respect, a large laminar shear box with outer dimensions of 420, 240 and 180 cm was designed and constructed. The laminar shear box consisted of 23 steel laminates with inner dimensions of 306×172 cm. Four experiments were carried out to investigated the behavior of single, 2×2, 3×3 and 3×5 piles. Two experiments were conducted to assess stone columns technique (loose and dense) against lateral spreading effects on two 2×2 pile groups. The physical models were fully instrumented at free field (far from the piles) and near the piles with various transducers, e.g. acceleration, displacement and pore water pressure. The piles were also instrumented with pair strain gauges at different sections to measure pure bending moment. The base input motion including sinusoidal cycles with amplitude of 0.3 g and frequency of 3 Hz parallel to the ground slope. The results including acceleration and displacement of the soil and the pile caps, pore water pressure at free field and near the piles, monotonic and total bending moments of the piles, lateral force and soil pressure on the piles are presented and discussed in this dissertation. The soil pressures on the piles obtained in the experiments were compared to Japan Road Association (2002) guildline. Also the effects of several parameters, e.g. boundary condition (container), situation of the piles in the group, the existence of the superstructure weight and the non-liquefiable crust layer on the response of the piles to lateral spreading were investigated. The efficacy of the stone column technique against lateral spreading were investigated and discussed
  9. Keywords:
  10. Lateral Spread ; Liquefaction ; Laminar Shear Box ; Stone Column ; Pile Group ; Shaking Table Test ; Liquefaction-Induced Lateral Spreading

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