Case history of a dewatering and recharge system in chalk
Case history of a dewatering and recharge system in chalk
The paper describes the performance of a dewatering and groundwater recharge system for a large excavation in chalk. The assessment of the effective bulk permeability of the chalk, and the probable hydraulic boundary conditions are discussed. The measured extraction and recharge flow rates, and the porewater pressures in certain locations, are in reasonable agreement with those calculated using a simple flownet analysis. The influence of groundwater chemistry on the effectiveness of the dewatering system is discussed with reference to an incident towards the end of the pumping period which led to the clogging of the pumps due to calcium carbonate precipitation following a rise in the pH of the groundwater.
basements, case history, chalk, chemical properties, groundwater, permeability
599-609
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Roberts, T.O.L.
ef394b99-fbc6-4d7a-8ea9-7716a4f1b78e
December 1995
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Roberts, T.O.L.
ef394b99-fbc6-4d7a-8ea9-7716a4f1b78e
Powrie, W. and Roberts, T.O.L.
(1995)
Case history of a dewatering and recharge system in chalk.
Géotechnique, 45 (4), .
(doi:10.1680/geot.1995.45.4.599).
Abstract
The paper describes the performance of a dewatering and groundwater recharge system for a large excavation in chalk. The assessment of the effective bulk permeability of the chalk, and the probable hydraulic boundary conditions are discussed. The measured extraction and recharge flow rates, and the porewater pressures in certain locations, are in reasonable agreement with those calculated using a simple flownet analysis. The influence of groundwater chemistry on the effectiveness of the dewatering system is discussed with reference to an incident towards the end of the pumping period which led to the clogging of the pumps due to calcium carbonate precipitation following a rise in the pH of the groundwater.
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Published date: December 1995
Keywords:
basements, case history, chalk, chemical properties, groundwater, permeability
Organisations:
Civil Engineering & the Environment
Identifiers
Local EPrints ID: 75697
URI: http://eprints.soton.ac.uk/id/eprint/75697
ISSN: 0016-8505
PURE UUID: 16190412-b5a2-4a45-b6c2-adeb7ff7e651
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Date deposited: 11 Mar 2010
Last modified: 14 Mar 2024 02:38
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Author:
T.O.L. Roberts
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