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论文类型：期刊论文

发表时间：2020-02-01

发表刊物：INTERNATIONAL JOURNAL OF GEOMECHANICS

收录刊物：EI、SCIE

卷号：20

期号：2

ISSN号：1532-3641

关键字：Rockfill material; Stress path; Critical state; Particle breakage; Grading evolution; Triaxial test

摘要：One of the most important features of soil behavior is the dependence of stress path. A series of large-scale triaxial compression tests was conducted to investigate the effect of stress path on critical state and particle breakage-induced grading evolution of rockfill material. All tests were first consolidated under constant principle stress ratio condition, and then sheared under three different stress paths, including constant lateral stress sigma(3), constant mean effective stress p', and constant vertical stress sigma(1). Test results indicate that the mean effective stress p', deviatoric stress q, and void ratio e along different stress paths reached the consistent critical state line (CSL) in the p'-q-e space. There was a power function between p' and q, and a linear relation between e and (p'/p(a))(xi) with xi=0.5 at the critical state. The particle breakage under different stress paths was found to be consistent at the same critical state, and a unique relation among e, p', and the particle grading parameters at the critical state existed irrespective of stress paths. The test results at the critical state formed a straight line in the e-(p'/p(a))(0.5)-I-G space. (C) 2019 American Society of Civil Engineers.