Clay–interface shear resistance

Abstract

The shear of clays of varying plasticity against interfaces of different materials and varying roughness has been studied in the ring shear apparatus. Results are compared with the shearing resistance of clay-on-clay. Particular attention has been paid to shearing resistance with large displacements, and the in¯uence of the interface in changing the shearing mode. The effect of corrosion of steel interfaces has been examined, as has the effect of fast shearing.

Slip effect at the pile–soil interface on dragload

“…Thus, in this study, interface friction coefficients l of 0.2-0.4 were adopted. These values were similar to the reported interface friction coefficient values between clayey soil and pile or steel surface reported by several authors [19][20][21][22].…”

Residual shear strength of fine-grained soils and soil–solid interfaces at low effective normal stresses

“…Comparatively, less displacement is needed to reach the interface residual shear strength. A similar behavior has been reported by several researchers (e.g., Lemos and Vaughan 2000).…”

“…(3) is developed based on values of interface shear strengths measured for soils with different plasticity and clay-size fractions sheared against surfaces with a wide range of average roughness. This range covers roughness of several materials used in geotechnical engineering practice such as pipeline smooth coatings, R a of 0.04-5 m (Farshad et al 2001;Ganesan et al 2014;Kuo and Bolton 2014), smooth geomembranes, R a of <2 m (Dove and Harpring 1999), and stainless and mild steel, R a of 0.06-2.5 m (Subba Rao et al 1998;Lemos and Vaughan 2000). Concrete surfaces (Hammoud and Boumekik 2006) and rough pipeline coatings (Najjar et al 2007;Ganesan et al 2014;Kuo and Bolton 2014) possess higher R a values.…”

“…The same devices have been used extensively to study the shear strength at the interface between fine-grained soils and solid material surfaces (e.g., Tika-Vassilikos 1991; Lehane and Jardine 1992;Lemos and Vaughan 2000). Because of the relatively small area available for shear combined with friction associated with the mechanical system, the commonly used design of these devices is not able to deliver low shear stresses to the soil specimen at a suitable accuracy.…”

Experimental and numerical modeling of thermally-induced ratcheting displacement of geomembranes on slopes

“…However, these conditions can be analyzed numerically by choosing an appropriate critical elastic interface displacement and friction coefficient and by including additional axial forces in the formulation to represent restraint systems ( Figure 3a). The numerical model considers an elastic, perfectly plastic constitutive model for the interface whereas most interfaces have strain softening behavior (Dove and Frost 1999;Lemos and Vaughan 2000;Esterhuizen et al 2001). This limitation can be overcome by implementing a strain softening constitutive model in Equation 5 defined by a peak and a residual strength.…”