Seismic Performance of Deep Excavations Restrained by Anchorage System Using Quasi Static Approach

Document Type : Geotechnical Earthquake Engineering

Authors

Amirkabir University of Technology, Tehran

Abstract

Soft grounds amplify the earthquake motions and the peak ground acceleration increases when passing through them. Thus, the response of structures constructed on such sites would be more severe than others. The deep excavations are one of the most vulnerable geotechnical structures during earthquakes particularly when performed in soft grounds. Hence, they have to be stabilized and restrained for these circumstances. Using the anchorage system is one of the most common methods to stabilize such excavations. The influence of different factors such as soil characteristics, and anchors' geometry and properties on seismic response of so-called restrained deep excavation is an important issue that needs to be focused on. In the present paper, the results of quasi-static finite element analyses of deep excavations performed in soft and stiff grounds during earthquake loadings have been presented, compared and discussed. The results show that considering adequate values for the anchor parameters (such as; angle, length and distance between the anchors and the amount of pre-stress force in them) leads to accurateand satisfactory design safety and deformation controls of the excavation

Keywords

References

1. Bayoumi, A., Bobet, A., and Lee, J. (2008)
Pullout capacity of a reinforced soil in drained
and undrained conditions. Finite Elements in
Analysis and Design, 44, 525-536.
2. Blanco-Fernandez, E., Castro-Fresno, D., Del Coz
Diaz, J.J. and Diaz, J. (2013) Field measurements
of anchored flexible systems for slope
stabilization: Evidence of passive behavior.
Engineering Geology, 153, 95-104.
3. Fellenius, W. (1936) Calculation of stability of
earth dams. Transactions, 2nd International
Congress on Large Dams. Int. Committee on
Large Dams, 445-462.
4. Jian, Y.S. (1990) Slope Analysis Using Boundary
Elements. New York, Springer-Verlang
Publisher.
5. Matsui, T. and San, K. (1992) Finite element
slope Stability analysis by shear strength reduction
technique. Soils and Foundations, 59-70.
6. Bolton, M.D. (1986) The strength and dilatancy
of sands. Geotechnique, 36(1), 65-78.
7. Lees, A. (2016) Geotechnical Finite Element
Analysis. ICE Publishing, London.
8. Maleki, M., Shamloo, S., and Kazemi, A.R. (2018)
A case study of effective factors on the displacement
of the trench wall by anchorage
system. 6th National Congress on Civil Engineering,
Architecture and Urban Development,
Tehran, Iran.
9. Maleki, M. and Nabizadeh, A. (2019) Investigation
of seismic behavior in restrained deep
excavation by the nailing system by finite element
method. 3rd International Conference on
Applied Researches in Structural Engineering
and Construction Management , Sharif
University of Technology, Tehran, Iran.

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