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In practice, numerical simulations of soil nail walls are often carried out to assess the performance and stability. In the present study,

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Reliability analysis of the buried flexible pipe-soil system is performed from three different failure criteria: ͑1͒ deflection; ͑2͒ buckling; and ͑3͒ wall thrust. The response surface methodology is used to establish approximate functional relationships between input variables and output responses and reliability analysis is performed using first-order reliability method approach. The available analytical solutions as well as the results of the numerical analysis are used in the reliability analysis and results are discussed. A comparison of results of the reliability analysis of the buried pipe-soil system in the light of available deterministic solutions indicated that the probabilistic approach, which considers variability in the input parameters provides a means of understanding of the performance of the buried pipe-soil system.