A comparison of quick undrained shear strength test on London clay

Abba, Hadi Abubakar (2015) A comparison of quick undrained shear strength test on London clay. MSc dissertation, University of Portsmouth.

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    Abstract

    The project aimed in comparing the quick undrained shear strength of London clay from the triaxial compression to that of the shearbox tests. Samples of the London clay from four boreholes were obtained from DJ Drilling Ltd. The Laboratory analysis were carried out in accordance with British standard 1377 (1990). A comparison between triaxial compression results to that of the shearbox results was not successful for the fact that maintaining the undrained condition during shearbox testing was not possible. From the results, a correlation between the apparent cohesion of the triaxial results to that of the liquid limit and moisture content have shown a good correlation, except borehole number 2 at 17 m depth which was as a result of the lithology of the soil. The linear equation of strength y = 26.772x-1243.5 in terms of liquid limit and y = 342.67x-8216.4 in terms of moisture content were established. The undrained shear strength parameters used in bearing capacity, slope stability calculations and foundation related problems were found. Even though care should be taken in using these values, if sampling was done during dry season or it has started dying up (Barnes, 2010). Very hard London clay with undrained shear strength greater than 300kN/m2 was found for the unweathered samples, and very stiff London clay with undrained shear strength 149.3 kN/m2 was established for the weathered London clay (Craig, 2004, p.110; Day, 2010). It was recommended that the shearbox test is to be repeated by sealing the specimen with an impervious cap. In addition, the dry sample is to be sheared as well.

    Item Type: Dissertation
    Departments/Research Groups: Faculty of Technology > School of Civil Engineering and Surveying
    Depositing User: Beth Atkins
    Date Deposited: 13 Nov 2015 14:45
    Last Modified: 13 Nov 2015 14:45
    URI: http://eprints.port.ac.uk/id/eprint/18885

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