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By John Woodward

The examine of the forged a part of the earth on which constructions are outfitted is an important a part of the learning of a civil engineer. Geotechnical procedures reminiscent of drilling, pumping and injection options increase the viability of many development methods by way of bettering flooring conditions.

Highlighting the floor research worthwhile for the method, the most likely development in energy of taken care of floor and trying out equipment An advent to Geotechnical Processes covers the weather of flooring therapy and development, from the regulate of groundwater, drilling and grouting to flooring anchors and electro-chemical hardening.

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Extra info for An introduction to geotechnical processes

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Fractures, joints, faults, fissures, shear planes, cleavage, bedding along which movement may take place) • geomorphology, erosion and weathering • groundwater and hydrogeology. Geotechnical processes to deal with the adverse factors resulting from the above are generally costly to install—although, where feasible, relief of groundwater pressure by gravity drainage is the most simple and economic solution for slopes. Ground investigation should follow the general principles used to prepare the An introduction to geotechnical processes 20 conceptual ground model as the first step.

The regulations require the geotechnical subcontractor to co-operate with the Principal Contractor in meeting the statutory obligations. See Perry (2002) for examples of forms. 6 Dealing with Problematic Soils The following are some examples of soils which will require particular attention by the geotechnical engineer when designing foundation treatment (F G Bell and Culshaw, 2001). EXPANSIVE SOILS Classification of cohesive soil in terms of consistency descriptions may be obtained from triaxial tests and N-values, but classification tests (Atterberg limits) (BS 1377:1990) are more useful and are essential when investigating the swelling/shrinkage potential of clay as seasonal water content is increased or reduced (BRE Digest 240, 1993; BRE Digest 412, 1996).

Inspection shafts to examine soil at depth or for access to a level to carry out in situ bearing tests should always be fully timbered (or sheet-piled) by a specialist; windows for examination/sampling should be opened only under the specialist’s supervision. Ground investigation 35 Caution: when inspecting/logging shafts: • always have a means of communicating with the surface and rapid escape— by hauling out • wear safety harness and safety helmet • have ventilation available. Large-diameter boreholes can be used as inspection shafts subject to compliance with the safety requirements in BS 8008:1996 for entering pile bores for inspection.

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