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Numerical Modeling of Deep Excavation Behavior and It’s Comparision with Monitoring Data

Eghtesad, Amir Hossein | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51445 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jafarzade, Fardin
  7. Abstract:
  8. Evaluating the magnitude and distribution of ground movements adjacent to an excavation wall is an important part of the design process when excavating in an urban environment. In urban environment, this movement controlled by monitoring and the result of monitoring need to compared with analysis result. 2D analysis can’t explain Three dimesional effects in excavation. This effects caused by the relatively high stiffness at the corners of an excavation lead to smaller ground movements near the corners and larger ground movement towards the middle of the excavation excavation's wall. Plane strain Ratio (PSR) quantify the magnitude of 3D corner effect in excavation defined as the ratio of the maximum wall displacement (δ3D) of a section (also middle section of wall) in 3D analysis over the maximum wall displacement (δ2D) of the section in 2D analysis. The higher the PSR, the lesser is the corner effect, and when PSR is unity, the section is in plane strain condition. In this study, From FEM 4 case studies done on 2D and 3D analysis with 3D real excavation lengths (L) and hight (H) and subsequently compared the results to independent monitoring result. Result shows a low ratio of (L/h) would provide more significant corner effect and when the ratio is about 4.0, behaviour is plane strain and provided a summery chart on corner effect and relationship with L/H ratio
  9. Keywords:
  10. Excavation ; Monitoring ; Case Study ; Three Dimensional Analysis ; Plane Strain ; Corner Angle ; Corner Effect

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