Yazar "Ahbab, Amirhossein" seçeneğine göre listele

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    Evaluation of the Static and Pseudo-Static Stability and Effectiveness of an Improvement Technique for Slopes of the Vanyar Dam Reservoir
    (Korean Society Of Civil Engineers-Ksce, 2021) Ahbab, Amirhossein; Akhlaghi, Tohid; Safari, Mir Jafar Sadegh; Avcı, Eyübhan
    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.
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    Prevention of Wind Erosion in Salty Lands of Urmia Lake with Butadiene Carboxylic Latex and Cement Grout
    (Springer Int Publ Ag, 2023) Ahbab, Amirhossein; Sardroud, Seyedeh Nahideh Eshaghi; Katebi, Hooshang; Avci, Eyubhan
    Known as one of the serious environmental problems, wind erosion can affect infrastructures, agricultural lands, human health and may create political problems between nations. By changing the climate in recent years and due to wind blowing in the area, the salt storms are generated in nearby salt lands. In this experimental study, the effectiveness of butadiene carboxylic latex emulsion and cement grout in preventing wind erosion in Urmia Lake region was investigated. The stabilized samples' resistance to wind erosion in an open-loop low-speed wind tunnel have been modeled based on the specific critical situation of study area (wind velocity of 30 m.s(-1)). The erosion rate decreased with the increment in the amount of cement grout sprayed on salt samples. Wind erosion rate decreased with increasing Butadiene carboxylic latex content in salt samples stabilized with butadiene carboxylic latex. It was observed that Butadiene carboxylic latex is more effective than cement grout in stabilizing salty lands against wind erosion. Wind erosion rate decreased by an average of 95% in stabilization with cement grout and 99% in stabilization with butadiene carboxylic latex. Experimental studies showed that both butadiene carboxylic latex and cement grout can be used to prevent wind erosion in Urmia Lake Salts.