design and use of vertical drains to increase post construction consolidation rates
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design and use of vertical drains to increase post construction consolidation rates

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Published .
Written in English

Book details:

Edition Notes

Thesis (M.Sc.) - University of Surrey, 1995.

StatementSimon Hassall.
ContributionsUniversity of Surrey. Department of Civil Engineering.
ID Numbers
Open LibraryOL19356641M

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The important input parameter in Barron's theory is the coefficient of radial consolidation (c r) and a rational assessment of c r is necessary for the economic design of vertical drains.   A post-construction settlement limit of 50 mm in 40 years within the 6-m approach slab of the bridge abutment. A simple analytical method has been developed for the design of preloads to achieve a design limit on postconstruction settlement, depending on rates of consolidation, spacing of vertical drainage, and amount of surcharge.   Based on the findings, a design method for an optimum system of horizontal and vertical drains is proposed and design charts are presented for such a design. The consolidation behavior of clay with a system of horizontal drains and vertical cylindrical drains is . The increased use of prefabricated vertical (PV) drains, or "wick" drains, on nighway projects has illustrated the need for design and construction guidelines to assist the design engineer. Recognizing the need, the federal Highway Administration (FHWA) has funded research to develop this manual.

the stability of the embankment and the construction and post-construction consolidation and lateral spread that occurs. Construction sequence in closure and filters and drains must be incorporated into the design to Design Standards No. Embankment Dams. Calculation of Primary Consolidation Settlement Given: Saturated clay soil layer thickness = H, cross-sectional area = A, existing overburden pressure = po, increase in pressure = ∆p, Find: resulting primary consolidation settlement ρc Change in volume is ∆V =−ρcA, change in volume is equal to the change in volume of the voids (definition of settlement) and by the definition of the. @article{osti_, title = {Consolidation of tailings}, author = {Nelson, J D and Wardwell, R E and Abt, S R and Staub, W P}, abstractNote = {The integrity of cover systems placed on tailings impoundments will be affected by the potential for differential settlement of the tailings surface. Settlement of the sand fraction will occur relatively rapidly.   When a soil is subjected to an increase in effective stress, the porewater is squeezed out in a manner similar to water being squeezed from a sponge, and the basic concepts presented above govern the time rate of settlement of the surface of a clay layer. The following sections describe the theory of onedimensional consolidation.

  The analyses included vertical drains at approximately 2 m centres, but also considered consolidation without drains (and one case without creep). The settlement–time plots in Fig. 20 show that the long-term total settlement is independent of the time at which the surcharge is removed, but as might be expected the timing strongly influences. This paper presents the quantification of uncertainties in the prediction of settlements of embankments built on prefabricated vertical drains (PVDs) improved soft soil deposits based on data collected from two well-documented projects, located in Karakore, Ethiopia, and Ballina, Australia. For this purpose, settlement prediction biases and settlement distributions were statistically computed Author: Jemal Jibril Muhammed, Priyantha W. Jayawickrama, Stephen Ekwaro-Osire. However, the consolidation of the soils is time dependent, delaying construction projects making it a non-feasible alternative. The soils treated are Organic silt, Varved silts and clays, soft clay, Dredged material The design considerations which should be made are bearing capacity, Slope stability, Degree of . Written by a group of international contributors, Ground Improvement Case Histories:Embankments with Special Reference to Soil Consolidation and Other Physical Methods, employs the use of case-histories to illustrate and apply equations, numerical methods and technology to undertake even the most complicated ground improvement projects. In this book, each case-history provides an overview of.