PROGRESSIVE FAILURE OF PERIMETER LOESS BANKS OF GOLESTAN- II RESERVOIR DAM

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GHIASIAN H.; HAYATI H.

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Paper Information

Journal: INTERNATIONAL JOURNAL OF INDUSTRIAL ENGINEERING AND PRODUCTION MANAGEMENT (IJIE) (INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE) (PERSIAN) Year:2006 | Volume:17 | Issue:4 Page(s): 67-77

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Title

PROGRESSIVE FAILURE OF PERIMETER LOESS BANKS OF GOLESTAN- II RESERVOIR DAM

Author(s)

GHIASIAN H. | HAYATI H. | Issue Writer Certificate

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Abstract

Construction of a reservoir may affect the stability of perimeter areas and stimulate sliding of potentially unstable slopes. In this thesis, the issue is first studied and important aspects of the problem and available treatments (including stabilization methods) are extensively reviewed. Next, the study is focused on Golestan II Dam as a case study. As the dam site is covered with collapsible windy deposits namely Loess, the behavior of such soils needs to be scrutinized. Loess is ~ery sensitive to changes of water content, and the stability of loessial slopes decreases dramatically after submergence or saturation. The required soil strength parameters used in the slope stability analysis are obtained from the results reported by the consultant. Some laboratory testing has also been performed by the author to verify the above results. Deterministic and probabilistic stability analysis is performed for two methods of GLE and Modified Bishop. In the probabilistic analysis, some logical values for mean and variation values are assumed for friction angle and cohesion of soil as input data, and failure probability and mean probabilistic safety factors are computed. The total likely volume of sliding mass for all surrounding slopes of at the maximum reservoir capacity of 2nd Golestan Dam is estimated to be 4 percent of the capacity, which means 1,800,000 m3. It is concluded that the sliding could spread in whole shorelines but would not be massive or catastrophic. It is proposed to put some restriction on land use around the reservoir and establish a monitoring program in order to mitigate the sliding hazard.

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