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Structural Stability Evaluation, Leech Lake Dam
A conventional stability analysis (rigid body assumptions) was conducted to determine the approximate magnitude of the loads acting on top of the piles supporting the monolith. It was necessary to conduct in situ tests to determine the strength characteristics of the foundation material. For this purpose a Menard pressuremeter was used to determine the in situ horizontal subgrade modulus. The horizontal modulus of subgrade reaction was used in a three-dimensional direct stiffness analysis to determine the forces and deflections at the top of the foundation piles. A beam on an elastic foundation analysis was performed and the pressure, moment, and deflection along the length of the most critically loaded pile was determined. The compressive forces, moments, and deflections predicted for the piles for all load cases were acceptable. However, the shear stresses and tensile forces in piles were predicted greater than allowable values; consequently, posttensioning of the monoliths to the foundation will be one solution to correct these deficiencies. Therefore, it is recommended that a slant-hole, soil anchor system to be used to induce compressive forces and to overcome the unfavorable tensile forces in certain piles, as well as to provide increased resistance to horizontal shearing forces.
Structural Stability Evaluation, Leech Lake Dam
A conventional stability analysis (rigid body assumptions) was conducted to determine the approximate magnitude of the loads acting on top of the piles supporting the monolith. It was necessary to conduct in situ tests to determine the strength characteristics of the foundation material. For this purpose a Menard pressuremeter was used to determine the in situ horizontal subgrade modulus. The horizontal modulus of subgrade reaction was used in a three-dimensional direct stiffness analysis to determine the forces and deflections at the top of the foundation piles. A beam on an elastic foundation analysis was performed and the pressure, moment, and deflection along the length of the most critically loaded pile was determined. The compressive forces, moments, and deflections predicted for the piles for all load cases were acceptable. However, the shear stresses and tensile forces in piles were predicted greater than allowable values; consequently, posttensioning of the monoliths to the foundation will be one solution to correct these deficiencies. Therefore, it is recommended that a slant-hole, soil anchor system to be used to induce compressive forces and to overcome the unfavorable tensile forces in certain piles, as well as to provide increased resistance to horizontal shearing forces.
Structural Stability Evaluation, Leech Lake Dam
C. E. Pace (author)
1981
75 pages
Report
No indication
English
Civil Engineering , Dams , Pile structures , Stability , Foundations(Structures) , Concrete , Loads(Forces) , Superstructures , Compressive properties , Strength(Mechanics) , Anchors(Structural) , Shear stresses , Tensile strength , Stiffness , Deflection , Structural analysis , Test and evaluation , Core sampling , Pressure measurement , Field tests , Deficiencies , Repair , Minnesota , Leech Lake Dam , Tensioning , Subgrades
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