基于能量法的尾粉土累积应变增长方式研究

发布时间：2018-04-03 15:22

本文选题：饱和尾粉土　切入点：循环应力比　出处：《岩土工程学报》2017年11期

【摘要】：为了研究累积塑性应变增长方式与能量耗散的关系,从机理方面进一步细化累积塑性应变增长方式。基于饱和尾粉土在3种孔隙比条件下不同循环应力比的固结不排水循环剪切试验,改进传统能量耗散计算方法,依据塑性应变累积能量耗散与黏滞累积能量耗散的关系对累积塑性应变增长方式进行了重新分类,并从能量耗散机理上阐述累积塑性应变的开展。研究结果表明:随着循环应力比增大,黏滞累积能量耗散速率将逐渐超越塑性应变累积能量耗散速率。将累积塑性应变增长形式细分为4类:稳定型、稳定破坏型、破坏型、和崩塌型。同时认为塑性应变累积能量耗散的产生是由于砂粒、粉粒等较大颗粒发生颗粒重排,而黏滞累积能量耗散的产生是由于黏粒、胶粒等较小颗粒间双电离子层内弱结合水发生脱离,粒间发生相对滑移。上述能量耗散机理与建立的累积塑性应变增长方式分类相一致,为进一步研究累积塑性应变模型提供研究基础。
[Abstract]:In order to study the relationship between cumulative plastic strain growth mode and energy dissipation, the mechanism of cumulative plastic strain growth mode is further refined.Based on the consolidation undrained cyclic shear tests of saturated tailings under three different void ratios, the traditional calculation method of energy dissipation is improved.According to the relationship between cumulative energy dissipation of plastic strain and cumulative energy dissipation of viscous strain, the growth modes of cumulative plastic strain are reclassified, and the development of cumulative plastic strain is expounded from the mechanism of energy dissipation.The results show that the viscous cumulative energy dissipation rate will exceed the plastic strain cumulative energy dissipation rate with the increase of cyclic stress ratio.The accumulative plastic strain growth forms are divided into four types: stable type, stable failure type, failure type and collapse type.At the same time, it is considered that the generation of cumulative energy dissipation of plastic strain is due to particle rearrangement of sand and silt particles, while the cumulative energy dissipation of viscous strain is caused by clay particles.The weak bound water in the double electric ion layer is separated and the relative slippage occurs between the smaller particles such as colloidal particles.The energy dissipation mechanism mentioned above is consistent with the classification of cumulative plastic strain growth mode, which provides a basis for further study of cumulative plastic strain model.
【作者单位】：华南理工大学土木与交通学院;华南理工大学亚热带建筑科学国家重点实验室;广东省重工建筑设计院有限公司;
【基金】：亚热带建筑科学国家重点实验室自主研究课题项目(2015ZC20)
【分类号】：TU43

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