Abstract
Aiming in this research was to have a clear view about the behavior of Khasa-Chai Dam during the draw down action taking into consideration the newly built of this dam which was filling during the time of this article, the upstream slope was investigated by taking drawdown of the water from the reservoir. This dam is consists of the zoned embankment with a total length of (2.36 km) with an upstream slope (1v:3h) and downstream slope (1v:2h). Slope stability was investigated during the drawdown of the water from the reservoir by considering the water in the reservoir to be at maximum water level and by taking two cases during the rapid and slow drawdown. SLOPE/W which is a sub program from Geo-Slope software was used in association with SEEP/W software to find the factor of safety of the upstream slip surface during the drawdown conditions. It was noticed from the drawdown conditions that the phreatic line falls almost at the same position for both cases. Also for both cases the factor of safety of the upstream slip surface falls above the value of (1.0) and that is mean the upstream slope is in a safe condition when the water drawdown. The exit gradient and the rate of flow at the downstream face decrease with time as the water in the reservoir drawdown which means the factor of safety against boiling increases with time. Â
Highlights
The stability of any slope depends on its soil properties, geometry and the forces that subjected to the slope internally and externally
Two cases were studied here to find the effect of drawdown on the stability of KHASA-CHAI Dam upstream slope: a)The first case is the rapid drawdown by fast draw of the water from the reservoir when the dam is at maximum natural reservoir level. b) The second case is the slow drawdown by slow draw the water from the reservoir during a time sequence when the dam is at maximum natural reservoir level
The minimum factor of safety falls above the value of (1.0) which means the upstream slope will be in a safe condition during the slow drawdown sequences Figure 18
Summary
The stability of any slope depends on its soil properties, geometry and the forces that subjected to the slope internally and externally. The slow drawdown case was studied by totally pull the water from the reservoir, the water in the reservoir was taken to be at the level of (45.17 m) and the time required for the reservoir to draw was taken to be at a sequence and to be empty in (40 days). Studied the effect of rapid drawdown condition on Dau Tien This two action depends on the rate of draw down and on the hydraulic conductivity and the rate of compressibility of the slope materials. Two cases were studied here to find the effect of drawdown on the stability of KHASA-CHAI Dam upstream slope: a)The first case is the rapid drawdown by fast draw of the water from the reservoir when the dam is at maximum natural reservoir level. The rapid draw down condition usually happened when the slope that is used to retain water experience a sudden lowering of the water in the reservoir and the internal pore
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