Abstract
There is mounting evidence in favour of replacing the e against [Formula: see text] diagram, conventionally used to represent soil compressibility in an oedometer, with a log(v) against [Formula: see text] diagram, which significantly improves the linearity of virgin loading and unloading paths. This paper presents a simple, new formulation of the ‘intrinsic’ compression and ‘sedimentation’ compression lines for a range of insensitive, sedimentary marine clays presented in Burland’s 1990 Rankine Lecture by using a log(v) against [Formula: see text] interpretation of the data.
Highlights
When samples of argillaceous soils are recovered, often in a disturbed state, it is a relatively simple matter to dry the soil, The present paper presents a reformulation of Burland’s proposal in which the compression data are plotted in a log(v) against logðsv0 Þ diagram, with v = (1 + e), in the form172 Downloaded by [] on [08/11/21]
Where ðsv00, v0Þ is a reference point on the virgin compression line and Cc0 is the relevant natural compression index for virgin compression. It was established by Butterfield (1979, 2011) and subsequently confirmed, recently by Suddeepong et al (2015), that such a logðvÞ−logðsv0 Þ interpretation of the data offers a much improved linearity for many soils over a wide range of sv0 values; a gradient that generates natural strains directly and is applicable to large strain deformation; compression equations that are independent of the base of the logarithms used for plotting; and a satisfactory interpretation of the earlier-mentioned difference in soil stiffness
■ two intrinsic void ratios, e*100 and e*1000, defined as the void ratios of each reconstituted soil corresponding to sv0 1⁄4 100 and 1000 kPa, respectively, together with their intrinsic compression indices ■ Cc* 1⁄4 ðe*100 − e*1000Þ, being the value of Cc for a line joining the above points in an e against logðsv0 Þ diagram
Summary
There is mounting evidence in favour of replacing the e against log10(sv0 ) diagram, conventionally used to represent soil compressibility in an oedometer, with a log(v) against log(sv0 ) diagram, which significantly improves the linearity of virgin loading and unloading paths. W sv0 sv0 0 reference specific volume on the virgin compression line specific volume at liquid limit intrinsic specific volumes of the reconstituted and natural samples, respectively, corresponding to sv* 1⁄4 1 atm water content effective vertical stress reference effective vertical stress on the virgin compression line reconstitute samples of it (typically with water contents at, or up to 1·5 times, their liquid limit) and determine from them compressibility parameters in virgin compression in an oedometer. Such soils are often found, normally consolidated, in a marine environment having undergone only sedimentary compression. Embedded in Burland’s analysis is an empirically extrapolated curve passing through two points on the e against logðsv0 Þ plot for soil in confined compression, within the vertical effective stress range of 100 kPa £ sv0 £ 1000 kPa, as a means of overcoming the fact that e against logðsv0 Þ curves for such soils, over a wider range of effective vertical stress, are usually non-linear
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