The Behavior of Supporting Structures with Pretension Anchors by Geotechnical Softwares

, M.Sc. Thesis Sharif University of Technology Ahmadi, Alireza (Author) ; Ahmadi, Mohammad Mehdi (Supervisor)

Abstract

In recent years, due to urban expansion and population growth, number of floors and excavations depth has increased. Stabilization of excavations is one of the most important issues in geotechnical engineering. Today, one of the most widely used methods that is used in deep excavations is brace soil by steels and pretension them. In this thesis tries to evaluate static behavior of flexible supporting structures with pretension anchors by using PLAXIS2D, FLAC3D and GEOSTUDIO softwares. The objective of this modeling is better understanding the static behavior of walls, comparing the two and three dimensional modeling and the effect of corners of excavation on deformation. The results shows...

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

, M.Sc. Thesis Sharif University of Technology Eghtesad, Amir Hossein (Author) ; Jafarzade, Fardin (Supervisor)

Abstract

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...

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

, M.Sc. Thesis Sharif University of Technology Mehdizadeh, Mehdi (Author) ; Ahmadi, Mohammad Mehdi (Supervisor)

Abstract

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...