Settlement predictions for normally consolidated alluvial silt Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/tx31qn07m

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  • Settlement of structures built on geologically recent compressible alluvium is a common cause of concern during design. Total settlement results from a combination of: 1) initial elastic settlement, 2) primary consolidation, and 3) secondary compression. The reliability of prediction of total settlement is affected by an understanding of these components and their interdependence. Conventional laboratory tests are used to evaluate primary consolidation. Methods which reliably predict secondary settlement on the basis of laboratory data are not well established in the literature. Preloading is a method to improve subsurface conditions and reduce the magnitude of final settlement beneath a structure. A preload fill is placed to precompress the site prior to construction so that settlements occurring after construction are tolerable. In the course of preparing development plans for a site located along the Columbia River, a preloading program had been established. Following a general review of the literature on the subject matter, this paper describes the site conditions and preload program and presents laboratory data and field settlement measurements for that project. The field measurements indicate that preloading can significantly reduce settlement of structures built on soft sandy silts and clayey silts which comprise the lower Columbia River alluvium. Secondary settlement is a significant portion of the settlement experienced on these soils and it can be controlled by preloading. The results of extensive conventional laboratory testing is correlated with the results of field measurements. A method is proposed to predict, on the basis of conventional laboratory tests, settlement on the alluvial soils deposited along the lower Columbia River.
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