Control of Groundwater by D. W. Quinion, G. R. Quinion

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By D. W. Quinion, G. R. Quinion

This consultant presents information regarding the evaluation of pumping and walling platforms for extracting groundwater. Contents comprise research of soil and groundwater, dewatering, safeguard, trench and underground excavations

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6. Mackay E. B. Construction Industry Research and Information Association. Technical Note 95 Proprietary trench support systems. CIRIA, London, 1979. 7. Greenwood D. A. and Thomson G. H. Ground stabilisation — deep compaction & grouting. ICE Works Construction Guide. Thomas Telford Ltd, London, 1984. 8. Muir Wood A. M. 30, Newnes-Butterworth, London, 1975. 9. British Standards Institution. Earthworks. Book. BSI, London, 1981, CP 6031. 10. Transport and Road Research Laboratory. A guide to the structural design of pavements for new roads.

Wellpoints are commonly used in sands and mixed soils containing sands. In more permeable soils, such as gravels, far larger Water piped away Fig. 11. Typical detail of sump pumping in trench quantities of water may need to be abstracted, which would mean wellpoints at uneconomically close centres. 6-3 m centres. In clay soils the rates of seepage are usually too small for the effective operation of a wellpoint system. The performance of the system in mixed soils will be affected by variations of permeability between pockets and layers of particularly permeable or impermeable soils.

It is occa­ sionally necessary to use a double-sided rather than a single-sided system when any header pipe system must be kept away from the trench to permit plant work adjacent to it on either side of the trench. The length of dewatering system operated at one time is determined by the economics of equipment hire, the length which can be controlled by a single p u m p , and the time required to install and obtain satisfactory perfor­ mance from the system by comparison with the rate of advance of the trenching operations (Fig.

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