Stability Analysis of Loess Slopes Based on Reliability Concepts
In engineering designs for cut slopes excavated in loess areas during highway construction, knowledge of the strength of the loess, including cohesion and friction angle, are essential, but these parameters are often very uncertain. Thus, the slope design needs to be based on field data rather than calculation. Field survey data on natural loess slopes could be used as a basis for cut slope design. This paper defines the natural limit state slope, and investigates the natural slopes in the field in Shaanxi province of China. Based on critical slopes, the reliability of loess slopes is calculated by the Monte Carlo method for various combination of loess strength parameters. The criterion of probability of failure is suggested for the loess slope design. Probability theory can be used to deal with the variation of soil properties in the loess slope design.
KeywordsLoess Slope Reliability Probability
This research work was aided by National natural science foundation of China (No.NSFC-40772181 and NSFC-40972182). The support of this agency is gratefully acknowledged.
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