Conclusion
In each particular case it is possible to judge from the relationship of the values of the standard deviations the advisability of taking into account variations of the density (water content) of soil samples and admissibility of assuming a linear relation between the ultimate value of the shear stress and density in the range of variation of soil samples represented by the sample. In a large range of variation of the density of soil samples the relation between the ultimate value of the shear stress and density can be represented as a piecewise-linear function.
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Additional information
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 12, pp. 22–25, December, 1986.
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Bukhartsev, V.N. Estimation of the strength parameters of soils with consideration of the different density of samples. Hydrotechnical Construction 20, 697–701 (1986). https://doi.org/10.1007/BF01425066
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DOI: https://doi.org/10.1007/BF01425066