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Study on Soil Slope Reliability Based on Random Field Theory

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Tutor: LiZongKun
School: Zhengzhou University
Course: Hydraulic Structure Engineering
Keywords: Slope stability,Reliability,With the airport,Fluctuation range,Correlation funct
CLC: TU43
Type: Master's thesis
Year:  2011
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Abstract:
The slope stability analysis is a classic problem, but also evaluate the embankment dam engineering safety in geotechnical engineering is a very important part. The a conventional fixed value of the safety factor design method failed to give full consideration to the geotextile in the work of the many uncertain factors, rather than the uncertainties in the actual role of significant can not be ignored. Therefore has important practical significance to the introduction of random field theory and reliability analysis in slope stability analysis. This article focuses on soil slope stability reliability theory and soil space with the study of the application of the airport, the system summarizes the basic methods of reliability design, analysis of the sources of uncertainty of soil and reliability of the calculated result. The C language checking point method reliability of slope stability calculation program, and apply this procedure to the cross-correlation of soil parameters, variability reliable indicator of the slope and crashed probability obtained in the same safety factor reliable indicators, the statistical properties of the soil parameters on the slope reliability were studied: 1, when the parameters were negatively correlated, a reliable indicator of absolute value increases as the correlation coefficient increases; When the parameters were positively correlated with the correlation coefficient absolute value decreases; negatively related to slope stability for favorable parameters. Engineering practice, mostly soil c and ¦Õ negative correlation, therefore, not considered in the calculation parameters makes calculations safer. 2, the variability of the parameters of the adverse soil slope stability. The safety factor, the greater the coefficient of variation of less reliable indicator, the greater the probability of failure. 3, the case of the same safety factor, when the coefficient of variation of amplitude at the same time, with ¦Õ the rate of change of the reliability index and crashed probability greater, a reliable indicator of the pair ¦Õ variability is particularly sensitive. The introduction of random field theory to study the parameter space of the soil since the correlation with the variability of the impact on the reliability of the method of calculation of the cross-section of the one-dimensional, two-dimensional random simulation slope and statistical parameters of this method for example correct, and then calculate out to consider the spatial variability of soil slope reliable indicator. Reliable indicator derived taking into account the spatial variability of soil increased significantly. Based on the theory reliability analysis with the airport directly calculate a reliable indicator of the slope and crashed probability, more reasonable and intuitive than the security status of the safety factor design method. Reasonable assurance as to the range of spatial fluctuations of the soil and the autocorrelation function of the reliability analysis is of great significance, but the study of the theory in this regard is not perfect, needs further study.
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