Structural Stability Evaluation, Winnibigoshish Dam.
Abstract
A typical interior monolith of Winnibigoshish Dam was evaluated for adequacy in stability for five load cases: Normal operation; Normal operation with truck loading (H15-44); Normal operation with earthquake; Normal operation with ice; and High-water condition. By using the conventional stability analysis (rigid body assumptions), the approximate magnitude of loads which are on the foundation piles were determined; but, without knowing the supporting characteristics of the foundation material, an estimation of the adequacy of the structural stability was inconclusive. The supporting characteristics of the foundation material were determined by in situ testing using a pressuremeter to predict the horizontal supporting characteristics of the pile-soil system. Two NX core holes were drilled through typical monoliths to obtain access to the foundation material. One other hole was drilled to sample the supporting decking, beams, and piling. the pressuremeter tests were performed and in situ soils data obtained. The horizontal soil modulus was obtained as a variation with depth into the foundation material and with soil deformation for three test positions in each of the two test holes. The horizontal modulus of subgrade reaction was then used in a three-dimensional direct stiffness analysis to determine the forces and deflections 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 were determined.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1981
- Accession Number
- ADA107337
Entities
People
- Carl E. Pace