A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Hydromechanical behavior of unsaturated artificially–hydrophobized sand: Compression, shearing, and dilatancy
Abstract Artificially-hydrophobized soil has been used in geotechnical applications, such as slope stabilization. This application requires a thorough understanding of the soil's hydromechanical properties to inform stability assessment. The shearing behavior of dry and fully saturated hydrophobized sand has been extensively investigated in the literature. Yet, knowledge on the effects of unsaturation on the soil's hydromechanical properties is scarce. Thus, how hydrophobic coating affects geotechnical properties such as compressibility and stress–dilatancy relation is unclear. This study conducted a comprehensive and systematic test program to, for the first time, quantify the hydromechanical properties of unsaturated hydrophobized Toyoura sand under wide ranges of confining pressure (25–300 kPa) and degrees of saturation (S; 0%–100%). The sand was hydrophobized by dichlorodimethylsilane (DMDCS). Constant-water-content shearing tests and compression tests were performed using the direct-shear box and oedometer apparatus, respectively. The test results revealed that the hydrophobic coating (i) made the compressibility index, swelling index, and peak friction angle independent of S; (ii) switched the sand's stress–strain behavior from strain-softening to strain-hardening at any degree of saturation; (iii) made the low-stress nonlinearity associated with sand dilatancy almost vanish; and (iv) made the peak friction angle to be practically independent of stress.
Highlights Hydromehcanical behavior of unsaturated artificially-hydrophobized sand was tested Hydrophobic coating had minimal effects on the compressibility and swelling indices Hydrophobic coating switched the shear response from strain-hardening to softening Soil dilatancy and low-stress nonlinearity were reduced after hydrophobization Degree of saturation had minimal effects on the behavior of hydrophobized sand
Hydromechanical behavior of unsaturated artificially–hydrophobized sand: Compression, shearing, and dilatancy
Abstract Artificially-hydrophobized soil has been used in geotechnical applications, such as slope stabilization. This application requires a thorough understanding of the soil's hydromechanical properties to inform stability assessment. The shearing behavior of dry and fully saturated hydrophobized sand has been extensively investigated in the literature. Yet, knowledge on the effects of unsaturation on the soil's hydromechanical properties is scarce. Thus, how hydrophobic coating affects geotechnical properties such as compressibility and stress–dilatancy relation is unclear. This study conducted a comprehensive and systematic test program to, for the first time, quantify the hydromechanical properties of unsaturated hydrophobized Toyoura sand under wide ranges of confining pressure (25–300 kPa) and degrees of saturation (S; 0%–100%). The sand was hydrophobized by dichlorodimethylsilane (DMDCS). Constant-water-content shearing tests and compression tests were performed using the direct-shear box and oedometer apparatus, respectively. The test results revealed that the hydrophobic coating (i) made the compressibility index, swelling index, and peak friction angle independent of S; (ii) switched the sand's stress–strain behavior from strain-softening to strain-hardening at any degree of saturation; (iii) made the low-stress nonlinearity associated with sand dilatancy almost vanish; and (iv) made the peak friction angle to be practically independent of stress.
Highlights Hydromehcanical behavior of unsaturated artificially-hydrophobized sand was tested Hydrophobic coating had minimal effects on the compressibility and swelling indices Hydrophobic coating switched the shear response from strain-hardening to softening Soil dilatancy and low-stress nonlinearity were reduced after hydrophobization Degree of saturation had minimal effects on the behavior of hydrophobized sand
Hydromechanical behavior of unsaturated artificially–hydrophobized sand: Compression, shearing, and dilatancy
Zhou, Zheng (author) / Leung, Anthony Kwan (author) / Zhu, Wei Jun (author) / Li, Yuan Yuan (author)
Engineering Geology ; 291
2021-06-01
Article (Journal)
Electronic Resource
English
Influence of Cement-Voids Ratio on Stress-Dilatancy Behavior of Artificially Cemented Sand
Online Contents | 2012
Influence of Cement-Voids Ratio on Stress-Dilatancy Behavior of Artificially Cemented Sand
| British Library Online Contents | 2012
Influence of Cement-Voids Ratio on Stress-Dilatancy Behavior of Artificially Cemented Sand
| Online Contents | 2012