Graduate Thesis Or Dissertation
 

Numerical method for calculating construction pore pressures in embankments

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/j3860b01r

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  • A computer program was developed for estimating construction pore pressures in embankments without drainage at any location in the embankment at any time during construction. This program incorporated a modification of the Hilf-Brantz method of pore pressure calculation and a finite element method of stress computation. Previous methods of calculating construction pore pressures were improved upon (a) by using actual principal stresses, calculated in the program, to eliminate the assumption that the major principal stress in an embankment is equal to the overburden pressure and (b) by using the results of triaxial consolidation tests with volume change measurements performed at the total stress ratios anticipated in the embankment to eliminate the assumption of complete lateral restraint (one-dimensional consolidation) within the embankment. Significantly, the results of the triaxial consolidation test performed in this study showed that after saturation of a partially saturated soil by compression, the change in pore pressure was not equal to the change in the major principal stress, as implied by one-dimensional consolidation, but that it was related to the total stress ratio. The computer program developed for this thesis is intended to be a basic method for calculating construction pore pressures. It will require additional evaluation and modification for specific design applications. An automatic mesh generation routine has been incorporated into the program to facilitate its use by design personnel. Also, the program can be easily modified to allow for partial dissipation of pore pressures during construction and to use the effective stress strength parameters for calculating the factor of safety with respect to shear for each element in the embankment.
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