Use of passive anchors in increasing the stability safety factor of downstream slope of spillway in Shahriar Storage Dam

Ali Nemati Hayati, Mohammad Mehdi Ahmadi, Aliakbar Kashighandi, Mehdi Hajjar, Mehdi Dadashi

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Mining and Rock Mechanics

ABSTRACT: A hanging block in the right flank under the spillway of Shahriar Dam, Mianeh, Iran with minimal factor of safety of 1.37 is addressed in the present study. The safety factor is less than the admissible according to design specifications. The following paper aims at presenting a solution to increase the existing safety factor to the allowable limit by installation of passive rock bolts without berm removing. The latter is not only cumbersome due to topological conditions, but also may be detrimental to the spillway structural concrete and rock-mass foundation. After plain failure analyses, it is found that passive anchors not only provide the required safety factor, but also are much more feasible considering construction limitations.

RÉSUMÉ: Un bloc de suspension dans le flanc droit en vertu de l'évacuateur de crues du barrage de Shahriar, Mianeh, l'Iran avec le facteur minimal de sécurité de 1,37 est abordé dans la présente étude. Le facteur de sécurité est inférieure à la recevable selon les spécifications de conception. Le document qui suit vise à présenter une solution pour augmenter le facteur de sécurité en vigueur à la limite permise par l'installation de boulons d'ancrage passif sans berme enlever. Ce dernier est non seulement lourde en raison de conditions topologiques, mais aussi peut être préjudiciable à l'évacuateur de crues en béton de structure et de fondation rocheuse de masse. Après des analyses de défaillance plaine, il est constaté que les ancres passive est non seulement le facteur de sécurité requis, mais ils sont aussi beaucoup plus facile tenant compte des limites de construction.

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Cite this article:
Ali Nemati Hayati; Mohammad Mehdi Ahmadi; Aliakbar Kashighandi; Mehdi Hajjar; Mehdi Dadashi (2011) Use of passive anchors in increasing the stability safety factor of downstream slope of spillway in Shahriar Storage Dam in GEO2011. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO11Paper427,author = Ali Nemati Hayati; Mohammad Mehdi Ahmadi; Aliakbar Kashighandi; Mehdi Hajjar; Mehdi Dadashi ,title = Use of passive anchors in increasing the stability safety factor of downstream slope of spillway in Shahriar Storage Dam,year = 2011}