TY - JOUR
T1 - Discussion of "correlations for fully softened shear strength parameters
AU - Stark, T. D.
N1 - Publisher Copyright:
© Copyright 2017 by ASTM International.
PY - 2017
Y1 - 2017
N2 - In this paper, the authors criticize the fully softened strength (FSS) correlation by Stark and Eid (Stark, T. D. and Eid, H. T., 1997, "Slope Stability Analyses in Stiff Fissured Clays," J. Geotech. Geoenviron. Eng., Vol. 123, No. 4, pp. 335-343) and subsequent updates (Stark, T.D., Choi, H., and McCone, S., 2005, "Shear Strengths for Analysis of Landslides," Journal of Geotechnical and Geoenvironmental Engineering, Vol. 131, No. 5, pp. 575-588; Stark, T. D. and Hussain, M., 2010, "Shear Strength in Preexisting Landslides," Journal of Geotechnical and Geoenvironmental Engineering, Vol. 136, No. 7, pp. 957-962; Gamez, J. and Stark, T. D., 2014, "Fully Softened Shear Strength at Low Stresses for Levee and Embankment Design," Geotech. Geoenviron. J., Vol. 140, No. 9) in the following five areas: (1) use of a torsional ring shear device, (2) converting the ring shear results to the triaxial compression mode of shear, (3) sample processing, (4) a non- continuous strength envelope, and (5) use of three distinct clay-size fraction groups even though admitting that the Stark and Eid (Stark, T.D. and Eid, H.T., 1997, "Slope Stability Analyses in Stiff Fissured Clays," J. Geotech. Geoenviron. Eng., Vol. 123, No. 4, pp. 335-343) correlation "is used widely and has been generally accepted in practice." The authors also use questionable direct shear test data from Castellanos (2014, "Use and Measurement of Fully Softened Shear Strength," Ph.D. dissertation, Virginia Tech, Blacksburg, VA, p. 805, https://www.dropbox.com/s/ 0k0ym51d8jdmn4v/Castellanos-FSS-Thesis-2014.pdf?dl=0.) to develop a fully softened strength correlation based on index properties, i.e., clay-size fraction (CF) and plasticity index (PI). The following paragraphs address these five criticisms, the questionable ring shear and direct shear testing presented in Castellanos (2014, "Use and Measurement of Fully Softened Shear Strength," Ph.D. dissertation, Virginia Tech, Blacksburg, VA, p. 805, https:// www.dropbox.com/s/0k0ym51d8jdmn4v/Castellanos-FSS-Thesis-2014.pdf?dl=0.), and the proposed FSS correlation.
AB - In this paper, the authors criticize the fully softened strength (FSS) correlation by Stark and Eid (Stark, T. D. and Eid, H. T., 1997, "Slope Stability Analyses in Stiff Fissured Clays," J. Geotech. Geoenviron. Eng., Vol. 123, No. 4, pp. 335-343) and subsequent updates (Stark, T.D., Choi, H., and McCone, S., 2005, "Shear Strengths for Analysis of Landslides," Journal of Geotechnical and Geoenvironmental Engineering, Vol. 131, No. 5, pp. 575-588; Stark, T. D. and Hussain, M., 2010, "Shear Strength in Preexisting Landslides," Journal of Geotechnical and Geoenvironmental Engineering, Vol. 136, No. 7, pp. 957-962; Gamez, J. and Stark, T. D., 2014, "Fully Softened Shear Strength at Low Stresses for Levee and Embankment Design," Geotech. Geoenviron. J., Vol. 140, No. 9) in the following five areas: (1) use of a torsional ring shear device, (2) converting the ring shear results to the triaxial compression mode of shear, (3) sample processing, (4) a non- continuous strength envelope, and (5) use of three distinct clay-size fraction groups even though admitting that the Stark and Eid (Stark, T.D. and Eid, H.T., 1997, "Slope Stability Analyses in Stiff Fissured Clays," J. Geotech. Geoenviron. Eng., Vol. 123, No. 4, pp. 335-343) correlation "is used widely and has been generally accepted in practice." The authors also use questionable direct shear test data from Castellanos (2014, "Use and Measurement of Fully Softened Shear Strength," Ph.D. dissertation, Virginia Tech, Blacksburg, VA, p. 805, https://www.dropbox.com/s/ 0k0ym51d8jdmn4v/Castellanos-FSS-Thesis-2014.pdf?dl=0.) to develop a fully softened strength correlation based on index properties, i.e., clay-size fraction (CF) and plasticity index (PI). The following paragraphs address these five criticisms, the questionable ring shear and direct shear testing presented in Castellanos (2014, "Use and Measurement of Fully Softened Shear Strength," Ph.D. dissertation, Virginia Tech, Blacksburg, VA, p. 805, https:// www.dropbox.com/s/0k0ym51d8jdmn4v/Castellanos-FSS-Thesis-2014.pdf?dl=0.), and the proposed FSS correlation.
KW - Atterberg limits correlation
KW - Compacted clay
KW - Direct shear
KW - Fully softened strength
KW - Ring shear
KW - Shear strength
KW - Stiff clay
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U2 - 10.1520/GTJ20160148
DO - 10.1520/GTJ20160148
M3 - Article
AN - SCOPUS:85039045864
SN - 0149-6115
VL - 40
JO - Geotechnical Testing Journal
JF - Geotechnical Testing Journal
IS - 3
ER -