Abstract
AbstractThe effect of particle shape on the strength, dilatancy, and stress-dilatancy relationship was systematically investigated through a series of drained triaxial compression tests on sands mi...
Highlights
The current study aims to investigate the effect of particle shape on the stress-dilatancy behavior of sand mixtures through a series of drained triaxial compression tests at various confining pressures
This paper presented a systematic investigation of the effect of particle shape on the stress-strain-dilatancy behaviors of sand mixtures through a series of deliberately designed triaxial tests
For a given confining pressure, stick-slip behavior in the stress-strain curve was more pronounced with an increase in overall regularity
Summary
Macroscopic mechanical behaviors of natural granular soils are significantly influenced by (1) internal factors, such as particle strength (Kuwajima et al 2009; Shipton and Coop 2012; Wei and Yang 2014), particle size (Varadarajan et al 2003; Frossard et al 2012; Dai et al 2016; Zhang et al 2016; Zhou et al 2016), particle size distribution (Kokusho et al 2004; Li et al 2013; Wang et al 2013; Ovalle et al 2014; Dai et al 2016; Strahler et al 2016; Xiao et al 2018a), particle shape (Cho et al 2006; Yang and Luo2015; Altuhafi et al 2016), and density (Been et al 1991; Wan and Guo 1998; Xiao et al 2014a); and (2) external factors, such as confining pressure (Charles and Watts 1980; Chiu and Fu 2008; Xiao et al 2016a, 2017; Strahler et al 2018), stress path (Vaid and Sasitharan 1992; Xu et al 2012; Xiao et al 2016b), loading mode (Chu and Wanatowski 2009), saturation (Oldecop and Alonso 2001; Yamamoto et al 2009; Ovalle et al 2015), and drainage conditions (Chu et al 2012). Papadopoulou and Tika (2016) found from monotonic and cyclic triaxial tests on coarse-fine mixtures that increasing fines plasticity up to a threshold value led to a decrease in the undrained strength and liquefaction resistance, while continuously increasing fines plasticity over the threshold value caused an increase in the undrained strength and liquefaction resistance. Yang and Wei (2012) conducted a series of undrained triaxial tests on four binary mixtures by adding distinct quantities of two nonplastic fines with different particle shapes (angular crushed silica and rounded glass beads) into two clean quartz sands. A significant finding is that adding rounded fines into clean sands caused an obvious decrease in the critical-state friction angle, while adding angular fines led to a slight increase in the critical-state friction
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