Hydromechanical behavior of unsaturated artificially–hydrophobized sand: Compression, shearing, and dilatancy
| Autor: | Wei Jun Zhu, Yuan Yuan Li, Anthony Kwan Leung, Zheng Zhou |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Dilatant
Shearing (physics) Materials science Degree of saturation 0211 other engineering and technologies Geology 02 engineering and technology 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology Overburden pressure Compression (physics) 01 natural sciences Oedometer test Compressibility Geotechnical engineering Saturation (chemistry) 021101 geological & geomatics engineering 0105 earth and related environmental sciences |
| Zdroj: | Engineering Geology. 291:106223 |
| ISSN: | 0013-7952 |
| DOI: | 10.1016/j.enggeo.2021.106223 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect