Stability Comparison of the Left and right Bank Mass move of LowerSiahbisheh Dam Reservoir

Subject Areas :

ناصر Ebadati ¹ , مرجان Madanipour ² , S.H Mirzeinali yazdi ³

1 - استادیار دانشگاه آزاد اسلامی واحد اسلامشهر
2 - کارشناس ارشد زمین شناسی مهندسی دانشگاه آزاد اسلامی واحد تهران شمال
3 - کارشناس ارشد زمین شناسی دانشگاه آزاد اسلامی واحد تهران شمال

Received: 2016-08-26 Accepted : 2016-08-26 Published : 2014-03-21

Keywords: Stability, landslide, Siahbisheh, power plant's dam,

Abstract :

In this paper try to evaluate the factors effective in instability of the lower Siahbisheh dam wall in the dam leftand rghit bank in terms of the slope sliding potential and the solutions to stabilization of the dam wallconsidering the technical and economic considerations as well as the present limitations. With this aim in view,in the first step the field inspections were made and the important terrain features and tectonic elements wereidentified, and after collecting the existing set of subsurface information, in order to determining the depthexpansion of the sliding mass, the displacement of sliding mass was identified using data resulting from theexploratory soil borings (sondage) having been excavated during the dam project studies' procedures. Next, thegeomechanical parameters of the sliding mass were estimated with suitable accuracy for performing the stabilityanalysis and the final instability analyses of the study area were carried out along profiles. Ultimately, thestability analysis results in different conditions: reservoir rapid water drawdown loading, gravity load, theearthquake conditions and the presence of water pressure were evaluated. The results showed that in all sectionsduring loading of rapid drawdown of the reservoir water, the safety factors of the slope will be less than 1 whichis indicative of inevitable failure of the slope. Methods of soil excavation and embankment upstream anddownstream of the sliding mass and the sliding mass and consolidate choice was offered. Excavation andembankment operations performed in this way, at least according to the calculated maximum volume soil worksis left bank.