Earth Pressures on Conduits and Retaining WallsThe objective of this investigation was to improve current design procedures for predicting earth pressures on rigid (concrete) conduits and retaining walls of the type frequently built by the U.S. Army Corps of Engineers. A comprehensive literature review was made to determine the generally accepted design methods (in addition to those of the Corps of Engineers) for predicting earth pressures on rigid conduits and retaining walls. Finite-element computer studies were performed to investigate the nature of earth pressures on buried conduits. Analytical comparisons were made of the many theories available for predicting earth pressures on retaining walls. Several suggested improvements to present Corps of Engineers design methods resulted from this study. The recommended procedures were compared with earth pressure data from several Corps of Engineer projects. In general, the suggested changes resulted in more accurate predictions of earth pressures on rigid conduits and retaining walls than are calculated by the present methods. This investigation has indicated several areas of inadequate present knowledge that could warrant further field and/or analytical study. |
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Table des matières
СНАРТЕR | viii |
1 Сircular Сonduits | 1 |
FreeВосіy Diagram Ditch Condition Assumed in | 7 |
Droits d'auteur | |
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Expressions et termes fréquents
active pressures assumed pressures backfill circular conduits clay coefficient compaction concrete Corps of Engineers crown pressure culvert DeQueen Lake Dierks Lake earth pressures edual elements embankment condition embankment dams End of Construction fill heights finite-element analyses Finite-Element Results friction angle height of fill horizontal pressures Instrument Station interface invert load maximum Normal Pressure Normalized to Normal oblong conduits overburden pressure Passive Pressure percent pipe predicted Pressure at Crown pressure distributions Pressure Factor pressures See Fig Proc Quarter-Point Rankine ratio rectangular conduits Results with Values retaining walls Rock Foundation shallow soil foundation shallow trench shear stresses shown in Fig Side-Shear Stress slope Soil Foundation Depths soil pressures soil types Spangler Spring line springline square conduit stiffness structural studies theory thrust and shear unit weight vertical pressures wall friction wall movement West Point Dam АТ Вс Ра т т

