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

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

This consultant presents information regarding the evaluate of pumping and walling structures for extracting groundwater. Contents contain research of soil and groundwater, dewatering, protection, trench and underground excavations

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Adjustments are needed when either of these starts to increase. When tunnelling without machines in clay soils, the ex­ cavated faces will usually appear dry when first exposed, but prolonged exposure in comparatively shallow tunnels may lead to weeping of these surfaces. This will be due to the exposed clay swelling, the fissures opening and permeability increasing to allow movement of pore water. Such swelling considerably increases the pressures on the temporary support system. In clay soils it is usual to employ drum diggers or pipe jacking methods which avoid temporary linings and lengthy exposure of sur­ faces, but this is often not possible in short runs, with small diameter tunnels or complex conditions when hand excavation is often the only method available.

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. TRRL, Crowthorne, 1970, Road note 29. BIBLIOGRAPHY British Standards Institution. Noise control on construction and demolition sites. BSI, London, 1975, CP 5228. Employers Confederation, London, 1961.

British Standards Institution. Site investigation. BSI, London, 1981, CP 5930. 3. Beaman A. L. and Jones R. D. Construction Industry Research and Information Association. Report 64. Noise from construction 1977. 46 and demolition sites. CIRIA, London, where inflows of water canot be sealed off by the other conventional methods, pipes are drilled and inserted for the circulation of refrigerated brine solutions to freeze the water in the ground. Alternatively when ground freez­ ing is required urgently for a short period, instead of us­ ing a recirculated refrigerant, liquid nitrogen can be in­ jected directly into the area to be frozen.

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