Graduate Thesis Or Dissertation
 

Finite element analysis of culverts under embankments with time dependent and non-linear properties

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  • A computer program was developed for analyzing culverts under earth embankments constructed of compacted cohesive soil using the finite element method. The culvert-embankment system is represented as a two-dimensional plane strain problem. The plane of investigation is taken normal to the culvert axis. The soil-culvert interface is assumed to be perfectly rough, with no possibility of slippage. The analysis is divided into two separate parts, to determine culvert forces and deformations during construction and after construction. The culvert is analyzed for forces and deformations at the end of every construction step due to the gravity effects of the fill material. The construction pore pressure in the embankment is estimated by the Hilf method, and zero dissipation of pore pressure during embankment construction is assumed. It is assumed that the soil is saturated and drainage occurs in the vertical direction after the embankment construction is finished. The culvert forces and deformations are calculated at any time after construction by the modified finite element method, assuming that changes in the culvert-embankment system occur because of consolidation of the embankment. The nonlinear, stress-dependent properties of soil are included in the study by considering the nonlinear problem as piecewise linear during each construction step or time increment. The computer program can be used to analyze circular or elliptical culverts under homogeneous embankments placed on a rigid foundation. It has been found that for high fills the program requires considerable computer memory locations. For complete analysis of culverts after construction, running time for the program is large.
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