Sensitivity Analysis On The Axial Soil Reaction Due To Temperature Induced Pipe Movements

Abstract

Seen from an international perspective preinsulated bonded pipe systems dominate in heat distribution. These pipe systems are usually buried in sand and soil-pipe interaction hinders thermal strains, which make economic solutions for bow- and T-sections possible. For static design pipe-soil interaction must be known as accurate as possible. However, several parameters are influencing the quantity of the expected soil reaction. Main influencing factors are dependent on the used bedding material and geometry. Furthermore current research results made additional soil-phenomena evident, which are hardening effects and stress redistribution during operation. A new calculation approach for the axial soil reaction was developed in 2015 based on existing test results and numerical simulations. A sensitivity analyses were carried out to estimate the significance of relevant parameters and the existing calculation approaches. This paper identifies the significant parameters and suggests parameter sets for lowest and highest axial soil reaction. Two main boundary situations are taken into account a) first movement b) during operation.