Instrumentation, Monitoring and Modelling of the Masjed-E-Soleiman Dam Infrastructure Project

S. Kakhi, N. Vlachopoulos

In the proceedings of: GeoRegina 2014: 67th Canadian Geotechnical Conference

Session: Instrumentation and Monitoring

ABSTRACT: This paper presents aspects of the Construction, Monitoring, Instrumentation, Monitoring and Modeling of the Masjed-E-Soleiman Dam. This marvel of hydro-electric dam infrastructure with a central clay core and a maximum height of 176 m, was constructed on the Karun River, Khuzestan, Iran. It consists of a 480 m long crest and the total volume of the clay dam body measures 13,000,000 m3. This paper summarizes the main construction and monitoring considerations for the dam itself as well as relevant factors associated with dam design and performance. The monitoring plan for the dam was intended to assist in the evaluation of the performance relating to seepage and leakage, and deformation due to slope instability, settlement, consolidation of fill, consolidation of foundation strata, secondary consolidation of fill and foundation, volume change in clay, changes in reservoir levels and seismic disturbance. Further, this paper summarizes the total stresses and pore water pressure in the clay core of the dam during the construction up until the end of construction, just prior to the filling of the reservoir through the use of monitoring data captured in-situ. These monitoring results have been amassed and consolidated in this report and were used as validation data for a finite element model that was created for this purpose. As such, the numerical model developed can be used to predict long time behavior and progress of consolidation of the dam's core. Moreover, it can be used to model the long-term deformations resulting from the consolidation progress. RÉSUMÉ Cet article présente les aspects de la construction, de la surveillance, de l'instrumentation et de la modélisation du barrage de Masjed -E- Soleiman. Ce merveilleux barrage hydro- électrique, possédant un noyau d'argile et une hauteur maximale de 176 m, a été construit sur le fleuve Karun, Khuzestan, Iran. Sa crête est d'une longueur de 480 m et le volume total du corps d'argile mesure 13,000,000 m3. Ce document résume les considérations principales entourant la construction et la surveillance du barrage ainsi que les facteurs pertinents liés à la conception et la performance du barrage. Le plan de surveillance pour le barrage a été conçu pour aider à l'évaluation de la performance relative aux infiltrations et aux fuites, et la déformation due à l'instabilité des pentes, le tassement, la consolidation du remplissage, la consolidation de la fondation, la consolidation secondaire du remplissage et de la fondation, le changement de volume dans l'argile, les changements dans les niveaux des réservoirs et les perturbations sismiques. En outre, le document résume les contraintes totales et la pression interstitielle de l'eau dans le noyau d'argile du barrage lors de la durée totale de la construction, juste qu'au remplissage du réservoir grâce à l'utilisation de données de surveillance in-situ. Ces résultats ont été amassés et consolidés dans ce rapport et ont été utilisés comme données de validation d'un modèle d'éléments finis qui a été créé à cet effet. En tant que tel, le modèle numérique développé peut être utilisé pour prédire le comportement à long terme et les progrès de la consolidation du noyau du barrage. Il peut également être utilisé pour modéliser les déformations à long terme résultant de la progression de la consolidation. 1 INTRODUCTION Over the past few years a significant advance that has been one of the important phenomenon in the studying behaviour and stability of embankment dams is the analysis of development and attenuation of pore pressure and total stress at the core of the dams. The development of excess pore pressure at the core results in reduction of effective stress, which leads to instability of the dam and long-term consolidation. In this paper the totalstress and pore pressure inside the core of Masjed-E-Soleiman Dam were analyzed using the GEOSTUDIO (2007) Finite Element Modeling (FEM) package. In order to verify the result of the analysis, the instrumentation results of the Masjed-E-Soleiman Dam were used and compared with the numerical simulation and analysis runs. The analysis consisted of an evaluation of the effective stress as well as settlement / consolidation analysis up until the end of construction. This study mainly focused on the behaviour of the dam within the maximum cross section (at Chainage 260/ Elevation 230,270 and 310) during construction. Analyses at the impounding stage, long-term behaviour and dynamic behaviour demands independent studies.

RÉSUMÉ: umentation, Monitoring and Modelling of the

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S. Kakhi; N. Vlachopoulos (2014) Instrumentation, Monitoring and Modelling of the Masjed-E-Soleiman Dam Infrastructure Project in GEO2014. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GeoRegina14Paper369,author = S. Kakhi; N. Vlachopoulos,title = Instrumentation, Monitoring and Modelling of the Masjed-E-Soleiman Dam Infrastructure Project,year = 2014}