Engineering geological case study of the site investigation and design of a major trunk road cutting in Carboniferous rocks

The presence of groundwater and its effects are often major considerations in the design of civil engineering works. The engineering geologist is expected to provide reliable information on this subject by means of appropriate site investigation techniques. In many instances possible changes in groundwater levels beyond the normal seasonal variations are not considered. Large changes can occur, for example, a reduction in groundwater pumping will cause water tables to rise, flooding basements and tunnels and possibly changes in the load bearing properties of soils. Civil engineering construction can have a similarly significant effect on local water supplies especially in the case of road cuttings, tunnels and pipelines. The British Standard Code of Practice for Site Investigations (BS 5930: 1981) does not contain any recommendation that site investigations should include an examination of local groundwater abstraction. Nor does it suggest that surveys should be carried out to locate and identify local private water supplies where there is a danger that the proposed construction will affect them. It is recommended that the Code of Practice is amended to include both these omissions.

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The engineering properties of mudrocks

Cripps¹,

Taylor

1981

QJEGH

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Summary The ‘rock’ and ‘soil-like’ properties of British mudrocks are shown to be influenced by: (a) their lithology; (b) their geological history of loading (especially during exhumation); (c) the type and method of testing; and (d) the degree of weathering. In particular, unloading and weathering leads ultimately to a normally-consolidated clay of much the same undrained shear strength, irrespective of age and origin of the parent material. For this reason, the engineering properties of the unweathered mudrocks are illustrated separately in terms of classification indices, undrained and effective shear strengths and deformability in relation to geological age.

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Engineering geological case study of the site investigation and design of a major trunk road cutting in Carboniferous rocks

Cited by 3 publications

References 6 publications

Engineering properties and slope stability of lower coal measures rocks from monk wood cutting, Unstone-Dronfield by-pass, Derbyshire

Engineering properties and slope stability of lower coal measures rocks from monk wood cutting, Unstone-Dronfield by-pass, Derbyshire

The inter-relationship between changes in groundwater conditions and engineering construction

The engineering properties of mudrocks

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