PRESSURE DISTRIBUTION ON UNDERGROUND STRUCTURAL CYLINDERS.
Rept. for 1 Mar 64-2 Apr 65,
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CIVIL ENGINEERING
Pagination or Media Count:
The objective of this study was to investigate the magnitude and distribution of radial contact pressures on a horizontally buried structural cylinder under the action of a uniform static overpressure applied on the soil surface. A computational procedure was developed for predicting these contact pressures and a parallel experimental phase, which constituted the major effort in this study, was conducted. The tests were designed to measure directly the radial pressure on the cylinder interface. The primary variables investigated were cylinder flexibility, cylinder compressibility, depth of sand cover, and magnitude of applied surface pressure. The approach taken in the analytical phase was to analyze an idealized representation of the soil-structure system by a closed mathematical formulation which assumed the soil to behave like a continuous, elastic medium. Simple modifications of the mathematical model were introduced to make it more realistically represent a structural cylinder buried in soil. The final distribution of stresses and displacements was computed in a step-wise linear fashion over the pressure range to account for the nonlinear stress-strain relationship for sand. The experimental and analytical results were compared to each other and to previous semi-empirical recommendations for the design of underground structures. It was concluded that the analytical formulation provides an extremely useful approach to the design of underground structural cylinders in general. Author
- Civil Engineering
- Structural Engineering and Building Technology