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Dynamic and Static Behavior of Soil Nail Wall and Stepped Soil Nail Wall

Borghei, Amin | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46123 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ahmadi, Mohammad Mehdi
  7. Abstract:
  8. Soil nailing is a method of in situ reinforcement utilizing passive inclusions. It can be used to retain excavations and stabilize slopes by creating in situ, reinforced, soil retaining structures. This method has been used widely in recent years. Construction of a soil nail wall is performed in vertical steps, with construction starting at the top of the excavation and proceeding down. Once an excavated step is reinforced with soil nails, a permanent or temporary facing is then applied to retain the soil. Stepped soil nail wall is formed by setting a platform in the middle part of a typical soil nail wall.In this Thesis, behavior of a soil nail wall and a stepped soil nail wall are studied in static and dynamic conditions, therefore, numerical models of these walls have been created and analyzed in a wide variety of situations.Goals of the research arestudying the Influence of the length of nails on behavior of a soil nail wall and calculating the optimum length, investigating the effect of the depth and width of a step on behavior of a stepped soil nail wall in static and dynamic conditions, and analyzing the dynamic behavior of both walls, to name but a few.The results of research indicate that if the length of nails increases, deformation of the wall decreases, but when the length of nails is bigger than the optimum length, lengthening the length of nails cannot noticeably reduce the deformation of the wall. The optimum depths of step in a stepped soil nail wall in static and dynamic conditions are 0.5 and 0.6 times of the wall height, respectively. In addition, the optimum widths of step in both conditions are 0.1 and 0.2 times of the wall height, respectively. As angle of internal friction and cohesion of soil rise, "stable phase of acceleration" and "critical amplitude of acceleration" of both walls increase. The results of this research can be used for better designing of these walls
  9. Keywords:
  10. Numerical Analysis ; Soil-Naile Walls ; Acceleration Critical Amplitude ; Stepped Soil Nail Wall ; Optimum Step Depth ; Acceleretion Stable Phase

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