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- W2120819283 abstract "The report describes work carried out in the geotechnicallaboratories of the BGS at Keyworth. A limited number ofundisturbed samples were collected from outcrops of theReading and Woolwich formations of the Lambeth Groupat locations in England by taking hand-prepared blocksamples and tube samples. A variety of geotechnicallaboratory tests, measuring shrinkage and swelling bothdirectly and indirectly, were carried out. These includedboth standard tests and new methods, based onexperimental research work, and included tests on bothundisturbed and remoulded specimens. The report describesthe results of these tests, compares them with the results ofgeotechnical index tests and mineralogical analyses, andexamines the shrink/swell classification of formationswithin the Lambeth Group. Where appropriate, comparisonsare made with data obtained for the Gault Formation andMercia Mudstone Group previously reported on.Swelling and shrinkage are two mechanical properties ofa soil, which though driven by related physico-chemicalmechanisms, are usually treated separately in the laboratory.Swelling sensu stricto is mainly a function of the clayminerals present in the soil or rock. The engineeringphenomena of heave and subsidence may be caused byfactors other than swelling and shrinkage of clays,respectively, for example, by stress relief, dissolution etc.The geological processes affecting swelling and shrinkagewere reviewed by Gostelow (1995). Usually, the assessmentof swelling and shrinkage does not involve directmeasurement, but rather indirect estimation of volumechange potential from index tests on reworked samples.There has been little change over the years to theshrink/swell tests that are described in British Standards.Three shrinkage tests are described in BS1377 (BSI, 1990),two for shrinkage limit and one for linear shrinkage. Bothshrinkage limit tests make use of mercury. The two simpleswelling tests in BS1377 (BSI, 1990) are based on theoedometer apparatus and measure swelling pressure(surcharge) and swelling strain (no surcharge). A swellingtest is also incorporated in the compaction test procedure." @default.
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- W2120819283 date "2004-01-01" @default.
- W2120819283 modified "2023-09-27" @default.
- W2120819283 title "The shrinkage and swelling behaviour of UK soils : the clays of the Lambeth Group" @default.
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