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The Behaviour of Ground Anchorages in a Tidal Environment.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	The Behaviour of Ground Anchorages in a Tidal Environment./
作者:	Carey, John Michael.
面頁冊數:	1 online resource (447 pages)
附註:	Source: Dissertations Abstracts International, Volume: 80-03, Section: C.
Contained By:	Dissertations Abstracts International80-03C.
標題:	Civil engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9780438496163

The Behaviour of Ground Anchorages in a Tidal Environment.
Carey, John Michael.

The Behaviour of Ground Anchorages in a Tidal Environment. - 1 online resource (447 pages)

Source: Dissertations Abstracts International, Volume: 80-03, Section: C.

Thesis (Ph.D.)--The University of Manchester (United Kingdom), 1993.

Includes bibliographical references

A programme of some 40 centrifuge model tests has been carried out on models of vertical, low pressure grouted ground anchorages in sand. Mechanisms of behaviour have been determined under both static and cyclic loading in dry sand and attention has been drawn to the discrepancy between the displacements required to mobilise ultimate side friction and ultimate end bearing. An applied cyclic load with a peak-to-peak amplitude of 10-15% static ultimate pull-out capacity has been found to have no reduction effect on the ultimate pull-out capacity of a model ground anchorage. Vertical model anchorages have been pretensioned and locked-off against a ground surface slab and subjected to both a single rise and a tidal variation in ground water table level. A loss of up to 30% of the initial residual load has been observed during a rise in ground water table level equal in magnitude to the embedment depth of the fixed anchor. A loss of up to 20% of the initial residual load has been observed after 80 tidal variations in ground water table level. Empirical models have been developed to explain these results and good agreement has been obtained between the observed and predicted model behaviour. Of fundamental importance during a rise in ground water table level is the relative stiffnesses of the tendon and the soil; the tendon in terms of the stiffness from the load-extension relationship and the soil in terms of the stiffness from the mobilised soil resistance-fixed anchor displacement relationship. Using the appropriate empirical model it is predicted that, for a typical ground anchorage in the field with a 10m free tendon length and a 5m fixed anchor length, there will be a loss of initial residual load of less than 0.5% for a 10m rise in ground water table if the position of the anchor head remains fixed. Of fundamental importance during a tidal variation in ground water table level is the accumulated irrecoverable displacement of the fixed anchor body and the load-extension stiffness of the free tendon length. For the same typical ground anchorage in the field, the appropriate empirical model predicts a loss of less than 1% of initial load for a 2m peak-to-peak tidal variation in ground water table over a 50-year design life if the mean displacement of the anchor head remains constant. It is predicted that there will be a further loss of up to 13% of the initial residual load due to a redistribution of side friction along the fixed anchor length. However, this further loss does not occur if the initial distribution of side friction is uniform or if the individual strands of the tendon are attached to the fixed anchor at single points i.e. as in a compression anchor or a shear tube anchor.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9780438496163Subjects--Topical Terms:

561339
Civil engineering.
Subjects--Index Terms:

Groundwater levelIndex Terms--Genre/Form:

554714
Electronic books.

The Behaviour of Ground Anchorages in a Tidal Environment.
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520 $a A programme of some 40 centrifuge model tests has been carried out on models of vertical, low pressure grouted ground anchorages in sand. Mechanisms of behaviour have been determined under both static and cyclic loading in dry sand and attention has been drawn to the discrepancy between the displacements required to mobilise ultimate side friction and ultimate end bearing. An applied cyclic load with a peak-to-peak amplitude of 10-15% static ultimate pull-out capacity has been found to have no reduction effect on the ultimate pull-out capacity of a model ground anchorage. Vertical model anchorages have been pretensioned and locked-off against a ground surface slab and subjected to both a single rise and a tidal variation in ground water table level. A loss of up to 30% of the initial residual load has been observed during a rise in ground water table level equal in magnitude to the embedment depth of the fixed anchor. A loss of up to 20% of the initial residual load has been observed after 80 tidal variations in ground water table level. Empirical models have been developed to explain these results and good agreement has been obtained between the observed and predicted model behaviour. Of fundamental importance during a rise in ground water table level is the relative stiffnesses of the tendon and the soil; the tendon in terms of the stiffness from the load-extension relationship and the soil in terms of the stiffness from the mobilised soil resistance-fixed anchor displacement relationship. Using the appropriate empirical model it is predicted that, for a typical ground anchorage in the field with a 10m free tendon length and a 5m fixed anchor length, there will be a loss of initial residual load of less than 0.5% for a 10m rise in ground water table if the position of the anchor head remains fixed. Of fundamental importance during a tidal variation in ground water table level is the accumulated irrecoverable displacement of the fixed anchor body and the load-extension stiffness of the free tendon length. For the same typical ground anchorage in the field, the appropriate empirical model predicts a loss of less than 1% of initial load for a 2m peak-to-peak tidal variation in ground water table over a 50-year design life if the mean displacement of the anchor head remains constant. It is predicted that there will be a further loss of up to 13% of the initial residual load due to a redistribution of side friction along the fixed anchor length. However, this further loss does not occur if the initial distribution of side friction is uniform or if the individual strands of the tendon are attached to the fixed anchor at single points i.e. as in a compression anchor or a shear tube anchor.
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653 $a Groundwater level
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