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Study the Effect of Staged Construction and Behavior of Concave Corner of Excavation Stabilized by Soldier Piles with Pretensioned Anchor by 3D Numerical Modeling

Mehdizadeh, Mehdi | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52320 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ahmadi, Mohammad Mehdi
  7. Abstract:
  8. In recent years, due to the development of cities and population growth, the number of underground floors and the depth of excavations have increased. Sustainability of excavation and control of deformation due to excavation process has always been considered as one of the important issues in geotechnical engineering. One of the most commonly used systems for deep excavation, especially in urban areas, is the soldier pile wall with tiebacks. This system consists of anchoring on soldier piles that are performed at horizontal distances around the excavation range. The cables have two parts. Unbond and bond length that, when pretensioned, have the task of transfering load out of the wedge of failure. Shotcrete or wooden plates are used between the piles to help local stability of the soil. In this thesis, we try to evaluate the static behavior of flexible retaining wall with pretensioned anchors using FLAC3D software. The purpose of this modeling is to better understand the static behavior of the excavation and to study the effect of corner on the reduction of deformation. Results show that increasing the friction, the modulus of elasticity, cohesion, the ratio of unloading modulus to loading modulus, increasing the stiffness and depth of embedment of the pile and increasing the pretension force of the cable leads to a decrease in the displacement of the wall. Also, useing the middle section design for the corner of excavation, the settlement and the displacement take place in the corner will be less than the midpoint of the excavation. For optimization the designer can use less stiffness and embedment depth for the pile, less unbond and bond length, and less pretension force for the cable
  9. Keywords:
  10. Soldier Pile Wall with Tieback Method ; Anchorage Method ; Three Dimensional Modeling ; FLAC Software ; Excavation Corner ; Excavation

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