粗粒土CT三轴流变试验研究  

CT triaxial rheological test on coarse-grained soils

作　　者：姜景山[1,2] 程展林[2] 左永振[2] 丁红顺[2] 

机构地区：[1]南京工程学院建筑工程学院,南京211167 [2]长江科学院水利部岩土力学与工程重点实验室,武汉430010

出　　处：《岩土力学》2014年第9期2507-2514,共8页Rock and Soil Mechanics

基　　金：长江科学院开放研究基金资助项目(No.CKWV2013205/KY);南京工程学院校级科研基金项目资助(No.YKJ201330)

摘　　要：一些土石坝在建成后后期变形明显,这与粗粒土的流变密切相关。目前,粗粒土流变研究主要集中在力学性质试验和本构模型研究等方面,较少对粗粒土流变中的颗粒运动规律进行研究。通过单级配矾石CT三轴流变试验,研究了粗粒土流变过程中颗粒运动规律。试验结果表明,粗粒土的流变过程就是粗粒土颗粒位置相互调整的过程,即颗粒从不稳定结构状态向稳定结构状态调整变化的过程,直到所有颗粒的能量都达到最小状态,此时颗粒不再发生错动、转动和破碎,粗粒土达到流变稳定状态。对粗粒土三轴流变过程中颗粒运动规律的认识,有助于加深对粗粒土流变性质的了解,为工程应用提供参考。Some earth and rockfill dams have significant later stage deformations after constructions, which are closely related to the rheology of coarse-grained soils. The study of rheology for coarse-grained soils mainly focuses on mechanical tests and constitutive models. However, particle movement of coarse-grained soils in rheological test is not well evaluated. The CT triaxial rheological test of a single grading aluminite is conducted to investigate the particle movement of coarse-grained soils. The test results show that the rheological process is an adjustment process of particle position from unstable structure state to stable structure state for particles in coarse-grained soils. The rheological process will not stop until all particles reach the minimum energy state. No particles move, rotate, and break under the rheological steady state. The investigation of particle movement for coarse-grained soils contributes to the understanding of rheological behavior of coarse-grained soils, and also helps to provide reference to engineering application.

关 键 词：粗粒土 CT试验 三轴试验 流变 颗粒运动 变形机制 应力-应变关系 细观组构 

分 类 号：TU411[建筑科学—岩土工程]