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stress-dilatancy of Zipingpu gravel in triaxial compression tests

Science China(Technological Sciences) 2016年第2期59卷 214-224页

作者： LIU JingMao ZOU DeGao KONG XianJing LIU HuaBei State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Institute of Earthquake Engineering School of Hydraulic Engineering Dalian University of Technology School of Civil Engineering and Mechanics Huazhong University of Science and Technology

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 quar- ried gravelly and rockfill materials in the literature. A nearly linear relationship between the dilatancy Dp and the stress ratio η 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 con- fining pressure, with the exception of sub-rounded gravel with little particle breakage. A nearly linear relationship was found between the phase-transformation stress ratio Mf and the state parameter ψ for the Zipingpu gravel, regardless of the void ratio and confining pressure of the specimens.

关键词： dilatancy gravel phase-transformation stress ratio triaxial compression state parameter particle breakage

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