Evaluation of Stability of Spillway Gable Roof of Nazlu Dam via Slide Software

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Evaluation of Stability of Spillway Gable Roof of Nazlu Dam via Slide Software

Original Article, D42
Davoudi S, Siosemarde M, Merufinia E.
J. Civil Eng. Urban. 4(3): 274-281. 2014

ABSTRACT: The most prominent issue in the civil projects such as construction of dams is providing stable steeps of rocks and stones. Such studies aim at providing a gable roof’s stability coefficient in order to provide stability as well as an economical solution. This survey wills analysis the gable roof’s stability overlooking to the overflow body of Nazlu dam. According to results of exploratory boreholes related to the bed and results of investigation of particles existing on the gable roof, it can be deduced that crunch levels of gable roof's stones, their oxidation, continuation rate (the extent or duration of discontinuities), level spacing (the amount of vertical spacing between adjacent discontinuities of a joint sets), and patency rate (amount of vertical spacing between adjacent walls of a discontinuity) is variable between minor to moderate cases, minor to moderate cases,1 to 10 mm , 0.2 to 1, 2 to 10 mm, respectively. Filling-in rate of the stones is made of CaCo3 and sometimes calcic or clay. The shale part of the gable roof is severely crunched which indicates its instability. The result of instability analysis linked to the gable roof via the slide software (Version 6.0) on the three cutting section AA' (initial section of overflow part), BB'(median section of overflow part) and CC' (terminal section of overflow part) showed that most suitable stable steep will be AA', BB' cutting section between 45 to 60 degree and CC' between 40 to 45 degree. To create such steeps the need of extreme stone lifting is incontrovertible. But instead the desired steep will be provided and those lifted material will be used in the body construction of the dam.
Keywords: Limit Equilibrium Methods, Nazlu Dam, RDQ Index, Stability of Slope

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