An introduction to geotechnical processes by John Woodward

By John Woodward

The examine of the forged a part of the earth on which buildings are outfitted is a necessary a part of the educational of a civil engineer. Geotechnical methods similar to drilling, pumping and injection options improve the viability of many development procedures by way of enhancing flooring conditions.

Highlighting the floor research valuable for the method, the most probably development in power of handled floor and checking out equipment An creation to Geotechnical Processes covers the weather of floor remedy and development, from the keep an eye on of groundwater, drilling and grouting to flooring anchors and electro-chemical hardening.

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ROTARY CORE DRILLING Core drilling is used to provide relatively undisturbed samples of rock (from weak to strong) to evaluate the geological sequence beneath the site. The features of the rock mass which govern its mechanical behaviour are likely to be the weakest (fractured, loose) and therefore prone to disturbance by the drilling process or to loss in drilling debris. Advances in rotary core drilling now allow continuous cores of over-consolidated clays, sands and gravels to be obtained for more precise engineering descriptions (Binns, 1998).

Care is required in removing the core from the inner barrel; never hammer the barrel. 1) to the annulus between the inner and outer barrel, limiting erosion of the core. Discharge is through ports in the face or sides of the core bit. Triplex piston pumps are preferred for water flush, and positive rotary displacement pumps for mud. Flushing with chemical foams can adversely affect the quality of core, but polymer An introduction to geotechnical processes 38 fluids are now in use. g. high-pressure dilatometer tests, vane tests, borehole CCTV surveys, impression packer tests and core orientation.

Limestone and chalk) • aquicludes are soil layers (clays) and intact rock (granite) acting as barriers which limit and confine the gravitational flow of groundwater • perched water occurs when groundwater lies on less permeable lenses of soil embedded in the general aquifer; it may be released into excavations • artesian conditions exist where groundwater is confined under remote hydrostatic pressure in an aquifer by an aquiclude and rises spontaneously above the ground surface when penetrated by a borehole (‘sub-artesian’ conditions are when the groundwater rises but does not reach the surface) • capillary action may cause porewater to be drawn above the free water surface depending on the soil structure—it is minimal in gravels but potentially in excess of 5m in silts and fine sands.

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