首页|Inflow and outflow permeability tests in a very soft clay under low stresses
Inflow and outflow permeability tests in a very soft clay under low stresses
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In situ inflow and outflow permeability tests with the BAT probe at Sarapuí Ⅱ soft clay test site are presented.A description of the BAT permeability test is provided,discussing its advantages and short-comings,especially in the case of very soft clays under low stresses.Pore pressures were monitored during probe installation and were found to be slightly lower than piezocone u2 pore pressures,consistent with the position of the filter.The role of filter tip saturation was investigated after the usual saturation procedure provided an unsatisfactory pore pressure response during probe installation.Re-sults show that the vacuum saturation procedure provides adequate response during installation and increases the reliability of the coefficient of permeability determination in early measurements.Both inflow and outflow tests yielded similar results,indicating that careful execution of the test can lead to good test repeatability regardless of the loading condition.Various sequences of alternated inflow and outflow tests have yielded similar results,indicating that soil reconsolidation and filter clogging were negligible in the tests performed.Data are presented concerning the relationship between index pa-rameters and the in situ coefficient of permeability for Sarapuí Ⅱ clay,which plot outside the range of existing databases.
Permeability testSoft clayBAT probeInflow and outflow tests
J.W.S.Vargas、F.A.B.Danziger、F.R.Lopes、T.Lunne
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Federal University of Rio de Janeiro,Rio de Janeiro,Brazil
Norwegian Geotechnical Institute,Oslo,Norway
Coordena??o de Aperfei?oamento de Pessoal de Nível Superior-Brasil(CAPES)Petrobras
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