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Geomechanics and Engineering Volume 36, Number 6, March25 2024 , pages 527-543 DOI: https://doi.org/10.12989/gae.2024.36.6.527 |
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An experimental study on the behavior of the helical tiebacks in the flexible retaining walls |
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Majid Khanjani, Hamid Reza Saba, Seyed Hamid Lajevardi,
Seyed Mohammad Mirhosseini and Ehsanollah Zeighami
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| Abstract | ||
| In the implementation of most civil structures, especially underground, deep excavations with a vertical slope are required. Using flexible retaining walls is applied as one of the ways to stabilize vertical holes. Therefore, it is necessary to know the parameters affecting the performance of such walls in reducing their horizontal movement. In this research, by building a suitable laboratory model, the parameters of the amount of flexibility, the embedment depth of the wall, the type and number of tieback in the wall were investigated for 42 static laboratory models. The purpose of this research is to study the flexible retaining wall with helical tieback compared to simple tieback at different heights, which shows the best performance in terms of reducing horizontal displacement in proportion to increasing or decreasing flexibility. On the other hand, one of the parameters affecting the flexibility of the wall, which is its bending stiffness, was extracted by numerical software outputs and studied on the results such as relative flexibility, stiffness, safety and numerical stability of the wall.The results of this study show that among the parameters, in the first place, the effect of the type of tieback is inhibited and in the second place, the ratio of thickness to wall height is known as the most important parameter. the best performance for walls with the helical tiebacks in reducing their horizontal displacement can be economically, flexibly and stability assigned to a wall that tiebacks is in the range of H2t⁄ to H4t⁄ and its flexibility ratio is 2/3. | ||
| Key Words | ||
| flexible; helical tieback; simple tieback | ||
| Address | ||
| Majid Khanjani, Seyed Hamid Lajevardi,Seyed Mohammad Mirhosseini and Ehsanollah Zeighami: Department of Civil Engineering, Arak Branch, Islamic Azad University, Arak, Iran Hamid Reza Saba: Department of Civil Engineering, Arak Branch, Islamic Azad University, Arak, Iran; Department of Civil Engineering, Tafresh University, Tafresh, Iran | ||