Evaluation of the Static and Pseudo-Static Stability and Effectiveness of an Improvement Technique for Slopes of the Van
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-0780-0
Geotechnical Engineering
Evaluation of the Static and Pseudo-Static Stability and Effectiveness of an Improvement Technique for Slopes of the Vanyar Dam Reservoir Amirhossein Ahbab
a
, Tohid Akhlaghi
a
, Mir Jafar Sadegh Safari
b
, and Eyubhan Avci
c
Dept. of Civil Engineering, Tabriz University, Tabriz 5166616471, Iran Dept. of Civil Engineering, Yaşar University, Izmir 35100, Turkey c Dept. of Civil Engineering, Bursa Technical University, Bursa 16310, Turkey a
b
ARTICLE HISTORY
ABSTRACT
Received 10 May 2020 Revised 27 July 2020 Accepted 10 September 2020 Published Online 27 November 2020
Excavation on the inclined surfaces on the dam reservoir and rising water level may also affect the slope stability of the inclined surfaces in the dam reservoir under static and dynamic conditions. In this study, it is aimed to present a three-dimensional (3D) model to analyze slope stability of access road to the dam’s crest and calculates the value of FOS in process of instructing and exploitation of dam and estimating the possibility of landslide occurrence during excavations and impounding of the dam. To this end, analysis of the slope stability has been implemented based on the information obtained from the field inspections, investigations, geological surveys, manual and mechanical borings in laboratory and field experiments. For acquiring the value of factor of safety (FOS), an explicit-finite-difference code is implemented. Effects of excavations in different levels of slope and fluctuation of water table in instability of the slope have been analyzed. The outcomes reveal that through increasing the level of water, FOS is decreased and large amounts of soil were entered in the dam’s reservoir, blocking the entrance of the drainage valve and disrupt access way to the dam crest. Therefore, piles in the different distance have been used for controlling the slope stability and the best distribution of piles based on acceptable values for factor of safety in different regulations have been determined. It was observed that the excavation on the slope and increment of the water level in the dam reservoir influence the slope stability.
KEYWORDS Dams Finite difference Landslide Pile Slope stability Static analyze
1. Introduction Landslides are a natural disaster which causes death of people, livestock and destruction of industrial, residential sites, deforestation and loss of agricultural lands (Chacon et al., 2006). In the last century, landslides approximately have killed 6,000 people in Europe (Nadim et al., 2006). This phenomenon is really important, especially in surrounding of dams, because a huge volume of soil and materials are entered into the reservoir of the dam and it not only reduces the active capacity of dams, but also increases the possibility of terrible waves which can lead to a large destruction. The mechanisms of natural slope failures commonly involve an intricate interaction between hydrological and geote
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