BUCKLING OF THIN-WALLED CYLINDRICAL SHELLS IN SOIL
The report covers work carried out in the Cambridge University Engineering Department under a Transport and Road Research Laboratory sponsored Research Contract to study the behaviour of buried pipes. The work consists of a theoretical derivation of the buckling equations of a thin-walled cylindrical shell supported by an elastic medium. A buckling pressure is predicted that is a function of the one-third power of shell stiffness parameter and a two-third power of soil-stiffness. Consideration is given to how a proper elastic modulus for the soil should be chosen and the influence of that choice upon theoretical predictions. Comparison with experimental evidence shows that the proposed theory predicts the trend of the data but is inaccurate in magnitude. However, such errors can be explained by the lack of detailed information reported in the literature on the actual state of stress in the soil in relation to the test results. Without this information the choice of parameters is uncertain and may to some extent account for the difference between theory and experimental results. A design formulate is suggested which is obtained by empirically relating an oedometer test secant modulus to an apparent minimum tangent modulus for sand. Future work must be directed toward a proper evaluation of stress state in soil surrounding a shell and the appropriate constitutive law for soil characterization.
Transport and Road Research Laboratory (TRRL)Wokingham, Berkshire United Kingdom
- Cheney, J A
- Publication Date: 1976
- Features: Appendices; Figures; References; Tables;
- Pagination: 17 p.
- TRT Terms: Buckling; Cylinders (Geometry); Forecasting; Modulus of elasticity; Oedometers; Pipe; Shells (Structural forms); Soils; Stiffness; Stresses; Theory; Thin walls; Underground structures
- Uncontrolled Terms: Cylindrical shells
- Old TRIS Terms: Thin walled theory; Underground
- Subject Areas: Bridges and other structures; Geotechnology; Highways;
- Accession Number: 00152536
- Record Type: Publication
- Report/Paper Numbers: Report No. 204
- Files: TRIS, ATRI
- Created Date: May 31 1977 12:00AM