Page - 860 - in Book of Full Papers - Symposium Hydro Engineering

COMMISSION INTERNATIONALE DES GRANDS BARRAGES ------- VINGT-SIXIÈME CONGRÈS DES GRANDS BARRAGES Autriche, juillet 2018 ------- EFFECT OF DILATANCY ANGLE ON THE RELIABILITY ANALYSIS OF BEARING CAPACITY OF DAM FOUNDATION USING MONTE CARLO SIMULATION Mehraneh Maadi, Ali Noorzad Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University IRAN 1. INTRODUCTION Analysis and design of geotechnical structures continue to face many uncertainties, which make it difficult to choose the appropriate design parameters. In the conventional design, engineers are trying to cover the uncertainties involved with a relatively high safety factor. considering high safety factor leads to construction of conservative design of foundations so that in spite of high cost, due to ignoring the effect of uncertainty, engineering judgment should be very difficult. Selecting geotechnical parameters of soil, due to uncertainties in the field, has always been one of the most challenging issues in geotechnical engineering. Due to the uncertainties involved, it can be pointed out that considering constant parameters in soil analysis is not reasonable and the best solution to consider uncertainty in the soil is using probabilistic approach. Statistical parameters include the mean, coefficient of variation, and the density function of all parameters. The probabilistic analysis consists of methods that consider the effect of uncertainties on input parameters and determine the response regarding the uncertainty level. Some of these methods can be stated as reliability analysis method. Reliability analysis method makes it possible to quantify the uncertainties involved in the problem. It also determines safety factor according to the degree 860