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Abstract Waste is heterogeneous and its physico-mechanical parameters are characterized by extreme variability. Unit weight and shear strength of waste were measured by laboratory test on boring samples and the corresponding variation trend and probability characteristics were analyzed. Random parameters were generated according to the stratified and the overall probability characteristics. Reliability analyses were carried out using Monte Carlo method. The results show that as buried depth increases，effective cohesion of waste decreases whereas effective internal friction angle increases. There is a negative correlation between them. However，they are independent of each other in each waste layer. Standard deviation of safety factor obtained from reliability analyses considering stratified probability characteristics is smaller than that corresponding to overall probability characteristics. This illustrates that the variation trend and probability characteristics of waste parameters must be examined before a reliability analysis.
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Received: 21 November 2008
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