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Steady state performance of construction dewatering systems in fine soils

Record type: Article

The applicability of conventional theory to construction dewatering systems in fine soils is uncertain for a number of reasons. This Paper uses case records from 30 dewatering systems in fine soils to assess the suitability of various methods of analysis of conditions at the steady state. Guidelines are proposed for the selection of soil permeability from such data as are likely to be available at the design stage. The use of these guidelines, together with analytical techniques appropriate to the field boundary conditions, gives calculated flow rates which are generally within a factor of 3 of the recorded values. The field data suggest that dewatering systems in fine soils should not be designed to operate with average hydraulic gradients at entry into the wells in excess of 4 for well-points, or 10 for ejectors. It is shown that whereas the effectiveness of a dewatering system in a fine soil should not normally be affected significantly by a variation of a factor of 3 in the average soil permeability, an unexpected close source of recharge will seriously impair the performance.

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Citation

Preene, M. and Powrie, W. (1993) Steady state performance of construction dewatering systems in fine soils Geotechnique, 43, (2), pp. 191-205. (doi:10.1680/geot.1993.43.2.191).

More information

Published date: June 1993
Keywords: pore pressures, case history, ground-water, excavation, design, permeability
Organisations: Civil Engineering & the Environment

Identifiers

Local EPrints ID: 74544
URI: http://eprints.soton.ac.uk/id/eprint/74544
ISSN: 0016-8505
PURE UUID: c4cda669-ffdd-4c15-ab01-24e2f927d23a
ORCID for W. Powrie: ORCID iD orcid.org/0000-0002-2271-0826

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:45

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