高土石坝筑坝料本构模型参数研究

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Abstract Systematical testing studies on 8 kinds of materials for a high embankment dam whose maximum height is 258 m are performed. Stress-strain-strength characteristics of them in high stress conditions are analyzed through large triaxial tests. The results show that cohesion c of embankment materials does exist，which contradicts the routine idea c = 0. The value of c is suggested for this project. And the results show that shear strength characteristics are obviously nonlinear and deformation properties are harmonious. According to original physical meaning of Duncan-Chang model，an improved method for determining strength parameters is introduced，which involves a and b. Different figures are drawn in different axis strains a，and a or initial modulus Ei is obtained according to the possible minimum value of a，whereas b is gained from a bigger range of a. Since basic physical meaning of a and b are thoroughly different，the improved method overcomes the defect of routine method which obtains the two parameters on the same line. According to different coordinate scales，different parameters including a and b，and corresponding Ei，k，n and Rf of Duncan-Chang model are gained. Suggested parameters are proposed in comparison with constitutive parameters by routine method and they are proved to be reliable by data fitting.

Key words： rock and soil mechanics high embankment dam high stress large triaxial test constitutive model

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https://rockmech.whrsm.ac.cn/EN/Y2004/V23/IS1/4428