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Research on Fuzzy Risk Analysis Method of Gravity Dam Foundation Instability

Author: PengHuiHui
Tutor: MaZhenYueï¼›WangGang
School: Dalian University of Technology
Course: Water Resources and Hydropower Engineering
Keywords: Gravity Stability against sliding Risk Analysis Sensitivity analysis Fuzzy Risk
CLC: TV223
Type: Master's thesis
Year: 2011
Downloads: 83
Quote: 2
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Abstract


Gravity dam safety evaluation system, its stability against sliding is very important the gravity sliding stability analysis is generally by rigid body balance method to calculate the safety factor to evaluate, but in the actual project, conventional safety factor method does not take into account the uncertainty of the various parameters of variables that affect the safety factor, and evaluation of the stability of \The main contents include: First, the article describes the calculation of dam stability against sliding rigid body limit equilibrium method, finite element method and the partial coefficient method and its application to practical engineering examples, to get the same conclusion. Based on this study, the uncertainty of the dam instability, and raised the question of dam instability risk analysis. Secondly, based on risk analysis in the presence of random uncertainty gravity dam foundation instability random risk analysis, and the analysis of each variable and sensitivity study. With engineering examples drawn, without considering the coefficient of friction and cohesion negative correlation causes the risk-free rate calculated value is high, that conservative calculation results can be obtained; sensitivity analysis of the design variables on the reliability index and risk-sensitive factor, such as the coefficient of friction, cohesion and upstream water level, as well as other non-sensitive factor, obtained by the analysis of gravity dam foundation stability more important factors to provide guidance for the design and construction of the gravity, non-sensitive factor by setting processing can also greatly simplify the calculation of fuzzy risk. Focus of this article is based on gravity dam foundation stability against sliding of each factor randomness, fuzziness and ambiguity of the instability criterion, the introduction of fuzzy mathematics theory, three cases of fuzzy risk calculation model, and described in detail commonly used model for solving method - alpha Level Set method. Based safety factor fuzzy random limit state equation and improved fuzzy approach the corresponding fuzzy risk rate calculation and Research: easy to calculate the alpha level cut set of design parameters of the fuzzy failure criteria fuzzy, drop the semi-trapezoidal membership functions, fuzzy search in the calculation of design parameters and failure criteria fuzzy interval the same degree of impact on the risk-free rate, the risk-free rate and interval calculated as the final fuzzy risk evaluation. Projects calculation: This method parameters and failure criteria are a Level Set Method fuzzy risk rate more reasonable interval-valued fuzzy risk analysis calculated the dam safety conclusion is also consistent with the certainty of the existing norms .

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CLC: > Industrial Technology > Hydraulic Engineering > Hydraulic investigation of hydraulic design > Foundation and its reinforcement
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