PARTICLE CRUSHING AND DEFORMATION BEHAVIOUR
PARTICLE CRUSHING AND DEFORMATION BEHAVIOUR
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DOI：
10.3208/sandf.50.547
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发表时间：
2010-08
影响因子：
3.7
通讯作者：
M. Kikumoto;D. Wood;A. Russell
中科院分区：
文献类型：
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作者：
M. Kikumoto;D. Wood;A. Russell
Particle breakage occurs in granular materials with various engineering applications, such as when driving piles (especially where the strength of the particles is low) and in debris flows (where the energy levels are high), and the influence of this breakage on the mechanical behaviour of soils should be given proper consideration in a constitutive model for soils.颗粒破碎导致细颗粒数量增加并拓宽粒度级配，而拓宽级配的主要作用是降低临界状态线和压缩平面内体积响应的其他特性。在我们的研究中，现有的本构模型，即塞文-特伦特砂模型，其中临界状态线作为渐近态轨迹发挥着核心作用，已扩展到包括粒子破碎的影响。 Severn-Trent 砂是在运动硬化、边界表面框架内描述的摩擦硬化莫尔-库仑模型。中心假设是，强度被视为一个变量，取决于状态参数的当前值（距临界状态线的体积距离），该值随着密度和应力水平的变化而变化。如果临界状态线因级配扩大而下降，则状态参数趋于增加并且土壤感觉更松散。
Particle breakage occurs in granular materials with various engineering applications, such as when driving piles (especially where the strength of the particles is low) and in debris flows (where the energy levels are high), and the influence of this breakage on the mechanical behaviour of soils should be given proper consideration in a constitutive model for soils. Particle breakage results in an increase in the number of fine particles and broadens the grading of particle sizes, and the primary effect of broadening the grading is to lower the critical state line and other characteristics of the volumetric response in the compression plane. In our study, an existing constitutive model, the Severn-Trent sand model, in which the critical state line plays a central role as the locus of asymptotic states, has been extended to include the effects of particle breakage. Severn-Trent sand is a frictional hardening Mohr-Coulomb model described within a kinematic hardening, bounding surface framework. The central assumption is that strength is seen as a variable quantity, dependent on the current value of the state parameter (volumetric distance from the critical state line) which varies with changes in density and stress levels. If the critical state line falls as a result of broadening grading, the state parameter tends to increase and the soil feels looser.