Reliability level of the buried main pipelines linear part = Рівень надійності лінійної частини підземних магістральних трубопроводів

Abstract

This paper discuss loads and influences, which cause hoop and longitudinal stresses in the walls of the main pipeline linear part. Engineering-geological conditions, where is reasonable account differential settlements and respective longitudinal stresses, are substantiate. Natural and water saturated condition of the loessial loam bilinear models are improved. Stress strain state of the pipeline in the condition of soil local soaking is obtained. Probability density function and other statistics of the input random variables, such as operating pressure, temperature difference, deformation modulus of water saturated soil are developed Probabilistic parameters of the output random variables are obtained with help of Monte Carlo Simulation method. Such output random variables are differential settlements, hoop and longitudinal stresses. Pipeline reliability level is determined in the random variables technique, with help of linearization method.