【摘要】 首先介绍一种模拟岩土介质应变软化行为的方法,然后针对Mohr-Coulomb准则,采用数值实验,对不同强度参数演化过程对应的岩土介质的应力-应变曲线进行分析。数值结果表明,不同强度参数演化过程得到不同的峰值后区应力-应变曲线,围压对峰后曲线形态有很大的影响。由此说明室内外实验得到的应力-应变全过程曲线峰值后区段包含了强度参数演化的信息。研究工作可为峰值后区强度参数演化规律的确定提供一些启示。更多还原

【Abstract】 A new numerical approach to model the strain-softening behavior is introduced at first,then aiming at Mohr-Coulomb criterion,evolution of different strength parameters and the corresponding stress-strain curves are studied by means of numerical analysis.Numerical results show that the post-peak part of the stress-strain curve is much influenced by the evolution process of strength parameters;and the confining pressure affects greatly the shape of post-peak curve.Thereby the post-peak part of the stress-strain curve obtained from laboratory and in-situ tests contains data of the evolution law of strength parameters.The presented study may provide a heuristic method to determine the law of post-peak evolution of strength parameters.更多还原