Centrifuge model tests on doubly propped embedded retaining walls in overconsolidated kaolin clay

Richards, D.J. and Powrie, W. (1998) Centrifuge model tests on doubly propped embedded retaining walls in overconsolidated kaolin clay. Géotechnique, 48 (6), 833-846. (doi:10.1680/geot.1998.48.6.833).

Record type: Article

Abstract

A series of tests on model diaphragm walls embedded in an overconsolidated clay was carried out at the London Geotechnical Centrifuge Centre. The walls were propped at the crest at the start of excavation and, following the simulation of excavation, were immediately propped at formation level. A retained height of 10 m was modelled in all tests, and the depth of embedment below dredge level varied between 5 m, 10 m and 15 m. A 'softer' construction sequence was also investigated, with excavation to 5 m below the retained surface taking place prior to the installation of the crest-level prop. The effect of pre-excavation lateral earth pressure was also investigated. The test results show that an increase in embedment depth will lead to an increase in wall bending moment and a reduction in bottom prop load. There is no real advantage in terms of limiting ground movements in increasing the embedment depth without also increasing the wall stiffness.

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