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《Chinese Journal of Geotechnical Engineering》 2018-09
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Experimental study on dynamic deformation behavior of rockfill materials

Lü Xiao-long;CHI Shi-chun;JIA Yu-feng;State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology;Institute of Earthquake Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology;  
Large-scale cyclic simple shear tests on rockfill materials of limestone are performed to study the characteristics of dynamic moduli, damping ratios and residual deformations. The experimental results show that the curves of d dmax dG/G ~ ? and max d?/?~ ? are described by the modified nonlinear viscoelastic dynamic constitutive model. When the confining pressure and dynamic stress ratio are higher, the relationship between residual strain and numbers of cycles diverges the semilog rules evidently. Based on the test data, a power function is adopted to describe the development of residual strain. Then a residual strain model is proposed, which is a function of the average main stress, consolidation ratio and dynamic shear strain. By analyzing the collected test results, the feasibility of this model is validated.
【Fund】: 国家重点研发计划项目(2016YFB0201001)
【CateGory Index】: TV41
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