Abstract
Soil - structure interaction is an important theme observed in many civil engineering structures like fondations. The interface shear strength plays a significant role in the analysis and design of many structures constructed above or under the ground. In this study, a total of 28 specimens were tested at vertical stresses of 100, 200, and 400 kPa using direct shear apparatus under consolidated drained condition. A silty sand soil, as per USCS classification system was prepared in the laboratory at different water contents (4.5%, 8.8%, and 12.5%) and voids ratios (0.4, 0.6, 0.8, and 1). The frictional resistance of this soil was measured. The soil samples were also sheared against three steel surfaces of different textures (smooth, moderate-rough, and rough). The experimental results showed that the steel surface texture is an effective factor in soil-steel interface shear strength. The interface shear strength of the rough steel surface was found higher than smooth and semi-rough steel surfaces. In addition to the surface roughness, the water content and void ratio also play important roles in interface shear strength.
Highlights
The interface is usually defined as a contact zone between two bodies
Briaud et al [6] indicated that 43% of the resistance along a rigid concrete pile shaft embedded in stiff clay is provided by skin friction
Smith and Ray [7] reported that the frictional resistance generated along a concrete pile shaft contributed about 84% of the total soil resistance subjected to a lateral loading
Summary
The interface is usually defined as a contact zone between two bodies. The serviceability of the geotechnical structures is highly dependent on the behaviour of the layer of soil forming close to the structure surface (i.e. interface layer). The experimental results showed that the angle of internal friction and cohesion should be considered in calculating of skin friction of cohesive soils He indicated that the most important factors influencing on the interface shear strength are surface roughness, applied vertical stress, water content, soil composition, and solid material roughness. The influence of surface roughness on the shear strength behaviour of an interface between silty sand and a cement grout surface by means of direct shear apparatus is investigated by Chu and Yin [16] Their results indicated that the soil-interface shearing resistance depends primarily on the surface roughness, water content of soil, and magnitude of the applied stress. The aim of the present paper is to examine the influence of three major parameters namely surface roughness, soil water content and void ratio on the interface shear strength behaviour between silty sand soil and steel surface using direct shear apparatus
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