Vynnykov P. Reliability level of the buried main pipeline liniar part on stochastic soil basis

Object – deformation process of the system “buried main pipeline linear part – stochastic basis”; aim – estimation of the reliability level of the buried main pipeline linear part by hoop and longitudinal stresses criteria, on which makes impact stochastic base deformations, internal operating pressure and temperature differences; methods – fields and laboratory tests of soil deformational properties impact estimation; processing of the experimental data of the loads and impacts on the pipeline in the probabilistic techniques of random variables and stochastic functions; use of the analytical and numerical methods for calculation of the longitudinal and hoop stresses in the pipeline walls; probabilistic numerical modelling for estimation of the “buried main pipeline linear part – stochastic basis” system reliability level; novelty – for the first time calculated values of the reliability level of the buried main pipeline linear part reliability, which laid into stochastic base without special properties; design scheme of the “buried main pipeline linear part – collapsible basis” system was improved and calculated values longitudinal stresses into pipeline walls, which caused by system elements deformation; new statistics and distribution laws for loads and influences on the pipeline was obtained, which caused by change of the physical-mechanical properties of the soil base; for the first time implemented multi parametric finite element analysis of the system “buried main pipeline linear part – collapsible basis” with help of Monte-Carlo simulation; for the first time obtained reliability level by the longitudinal stresses criterion of the buried main pipeline linear part where occurs stresses due to deformation of the system elements; results – created methodic for longitudinal stresses calculation, which caused due to uneven soil deformations. It can be used for estimation pipeline strength according to national norms in area of pipeline design. Estimation of the pipeline reliability laid in the complex soil conditions can be used for pipeline calculating pipeline reliability according to national norms in building constructions reliability area. Improved methodic for pipeline reliability calculation allows to design constructions with precalculated reliability level, and it can be used for design of the main pipelines and building objects on stochastic soil base; field – construction