Release Time:2019-03-13  Hits:

Indexed by: Journal Article

Date of Publication: 2016-02-01

Journal: SCIENCE CHINA-TECHNOLOGICAL SCIENCES

Included Journals: CSCD、EI、SCIE

Volume: 59

Issue: 2

Page Number: 214-224

ISSN: 1674-7321

Key Words: dilatancy; gravel; phase-transformation stress ratio; triaxial compression; state parameter; particle breakage

Abstract: Experimental investigations of the dilatancy and particle breakage of gravelly material from the Zipingpu concrete-faced rock fill dam, which was subjected to high-intensity seismic load during the 2008 Wenchuan earthquake, were conducted through a series of large-scale drained triaxial compression tests. A hyperbolic relation between the input plastic work and the degree of particle breakage was found for Zipingpu gravel, independent of the initial void ratio and confining pressures. The stress-dilatancy for Zipingpu gravel was analyzed and compared with data from two rounded alluvial and three angular quarried gravelly and rockfill materials in the literature. A nearly linear relationship between the dilatancy D-P and the stress ratio 77 was found at medium-to-large stress ratios before the peak stress ratio. The slope of the stress-dilatancy line before peak had slight dependence on the void ratio and confining pressure of the gravel. After peak, the stress-dilatancy relation shifts down compared with that before peak for the gravel specimen. The phase-transformation stress ratio decreased with increased confining pressure, with the exception of sub-rounded gravel with little particle breakage. A nearly linear relationship was found between the phase-transformation stress ratio M-f and the state parameter psi for the Zipingpu gravel, regardless of the void ratio and confining pressure of the specimens.