TESTING STUDY ON CHARACTERISTICS OF STRENGTH AND DEFORMATION FOR COARSE MATERIALS
土石粗粒料的强度和变形特性的试验研究

Based on the stress path of dam,the triaxialtests of coarse materials are carried out with constantratios of the principal stresses and the stress increments to obtain the corresponding stress-strain relationship of course materials. According to the strength characteristics of coarse materials,a function is determined to describe the yield criterion of coarse materials. Based on this yield criterion and elasto-plastic theory,an elasto-plastic constitutive model for coarse materials is established. It can be expressed in invariants with clear concept,noodd dots and less parameters. In order to apply it to finite element method,the elasto-plastic matrix is deduced. It is shown that the stress-strain relations hip of coarse materials is in good agreement with experimental data.