Analysis and monitoring of behavior Rockfill dam ten years after end of construction ,Case study- Madani dam

Abstract

The purpose of research is to compare monitoring results with those result of numerical analysis and to present plan for the first reservoir impounding of the Rockfill dam ten years after end of constructing the dam body. The stability of dam body has been examined using the results of numerical analysis and the values obtained from the sensors installed in the dam. The correctness and accuracy of the geotechnical parameters of the dam body materials were confirmed by comparing the results of numerical analysis and monitoring based on back analysis. The linear correlation coefficients between the data obtained from the sensors and the numerical analysis results for the items of settlement, pore water pressure and total stress are 84, 67 and 99 %, respectively. The compatibility between the numerical analysis results, design assumptions, and instrumentation results were examined. The value of the arching ratio obtained from the results of instrumentation and numerical analysis in the core of the dam is 0.47 and 0.35, respectively, which indicates the safety of the dam. Ultimately, numerical sensitivity analyses was carried out for presente special impounding program for dam with controlling simultaneous two items the pore water pressure and effective stress changes in the clay core, with ten years passed since the completion of construction dam body.