Behavior of a circular cell bulkhead during construction Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/tt44pq805

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  • A single cell in a 12 cell bulkhead was instrumented to observe its behavior and confirm design assumptions during construction. Vibrating wire strain gages were employed to measure horizontal strains in sheetpiling webs. These were converted to interlock force at eight locations and three elevations around the cell. The deformed shape of the cell was detected by using an inclinometer. Movements of the cell both vertically and horizontally were observed using surveying methods. In addition, the position of the phreatic line inside cell was noted. Difficulties with installation of instrumentation are described. Performance of the instruments successfully installed is discussed. The effect of each construction event is presented in the form of graphs which show the horizontal stress on sheetpiling surfaces, interlock forces and deformed shapes for sheetpiling and movements of the cell. Results of the study showed that the current method of analysis for this type of structure is adequate for calculation of maximum interlock forces. The coefficient of lateral earth pressure, K, to be used in interlock stability analysis, was shown to be about 0.45 compared to a value of 0.4 that was used in design. The settlement of the cell was greater than expected. The cell settled around ten inches by the end of the construction period. The observed settlements were attributed to wave action on sheetpiling and the weight of the cell fill and backfill, although no specific evidence separating their respective effects was available. The maximum movement of the cell above the dredgelin.e toward the river was about ten inches. The phreatic line inside the cell was horizontal at all times, and at the elevation of the adjacent river.
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