The shear strength, when large displacements occur, at the interface between two types of clays and steel has been studied in the ring shear apparatus. The results obtained indicate that the surface roughness and the average diameter of particles have a significant effect on the interfacial shear strength.. According to roughness, two shearing modes are likely to take place: shearing at the interface and shearing within the soil. For soil- soil shearing, the "pre-sheared" clay shear strength is likely to be either equal (neutral effect) or greater (positive effect) than that obtained for not pre-sheared samples. However, in interface tests, the clays tested may exhibit neutral, positive or negative effect.
- Bond A.J. and Jardine R.J., "Effects of installing displacement piles in a high OCR clay", Géotechnique, Vol.41, N°3 (1991), pp.1147-1152.
- Tika-Vassilikos T.E., Bond A.J. and Jardine R.J., "Correlation of the results from fields experiments with instrumental model piles in London clay and laboratory ring shear interface tests", Proc. 6th Int. Conf. Behaviour Offshore Struct. London 1 (1992), pp.661-672.
- Lupini J.F., Skinner A.E. and Vaughan P.R., "The drained residual strength of cohesive soils", Géotechnique, Vol.31, N°2 (1981), pp.181-213.
- Kishida H. and Uesugi M., "Tests of interface between sand and steel in the simple shear apparatus", Géotechnique, Vol.37, N°1 (1987), pp. 45-52.
- Tika-Vassilikos T.E., "Clay-on-steel ring shear tests and their implications for displacement piles", Geotechnical Testing Journal, Vol.14, N°4 (1991), pp.457-463.
- Tika T.E., "Ring shear tests on a carbonate sandy silt", Geotechnical Testing Journal, Vol.22, N°4 (1999), pp.342-355.
- Lemos L.J.L. and Vaughan P.R., "Clay-interface shear resistance", Géotechnique, Vol.50, N°1 (2000), pp.55-64.
- Bromhead E.N., "A simple ring shear apparatus", Ground Engineering, Vol.12, N°5 (1979), pp 40-44.
- Bishop A.W., Green G.E., Garga V.K., Andersen A. and Brown J.D., "A new ring shear apparatus and its implication to the measurement of residual strength", Géotechnique, Vol.21, N°4, (1971), pp.273-328.
- Voight B., "Correlation between Atterberg plasticity limits and residual shear strength of natural soils", Géotechnique, Vol.23, N°2 (1973), pp.265-267.
- Uesugi M. and Kishida H., "Influential factors of friction between steel and dry sands", Soils and Found., Vol.26, N°2 (1986), pp. 29-42.
- Paikowsky S.G. , Player C.M., and Connors P.J., "A Dual interface apparatus for testing unrestricted friction of soil along solid surfaces", Geotechnical Testing Journal, Vol.18, N°2 (1995), pp.168-193.
- Dove J.E., Frost J.D., Han J. and Bachus R.C., "The influence of geomembrane surface roughness on interface strength", Proc. Geosynthetics '97, 1 (1997 ), pp.863-876.
- Subba Rao K.S., Allam M.M. and Robinson R.G., "Interfacial friction between sands and solid surface interfaces", Geotechnical Engineering, Proc. Instn Civ. Engnrs, N°131 (1998), pp.75-82.
- Skempton A.W., "Residual strength of clays in landslides, folded strata and the laboratory", Géotechnique, Vol.31, N°1 (1985), pp.143-157.
- Subba Rao K.S., Allam M.M. and Robinson R.G., "Drained shear strength of fined-grained soil-solid surface interfaces", Geotechnical Engineering, Proc. Instn Civ. Engnrs, N°143 (2000), pp.75-81.
- Tsubakihara Y. & Kishida H., "Frictional behaviour between normally consolidated clay and steel by two direct shear type apparatuses", Soils and Found, Vol.33, N°2 (1993), pp.1-13.
- Randolph M.F. and Wroth C.P., "Application of the failure state in undrained simple shear to the shaft capacity of driven piles", Géotechnique, Vol.50, N°1 (1981), pp.55-64.
- Chandler R., "Back analysis techniques for stabilisation works : a case record", Géotechnique, Vol.27, N°4 (1977), pp.479-495.
- Lemos L.J.L., Skempton A.W. and Vaughan P.R., "Earthquake loading of shear surfaces in slopes", Proc. 11th Int. Conf. Soil Mech. San Francisco, 4 (1985), pp.1955-1958.