水力发电学报2012，Vol.31Issue(6)：208-213,222,7.
不破碎颗粒材料三轴数值试验的模拟
Simulations of numerical triaxial tests on uncrushed granular materials
摘要
Abstract
It is difficult to describe the mechanical characteristics and micro mechanism of hydraulic materials with the continuum mechanics;particle sliding is one of the major factors that affect the strength and deformation of these materials.This paper presents a series of numerical triaxial tests based on the physical triaxial tests of steel balls and the particle flow method to explain the mechanical behaviours of uncrushed granular materials.Micro mechanism of deformation on uncrushed materials is discussed preliminarily.The simulations show that an increase in confining pressure causes an increase in initial modulus and a decrease in initial Poisson's ratio,and that a greater friction coefficient or a lower stiffness ratio of particle produces a greater initial modulus.The void ratio on loading increases with the axial strain,and its increasing rate is lowered by a higher confining pressure.Under lower confining pressure the deformation-pressure curve takes alternate softening-hardening fluctuations of small amplitudes,while under higher confining pressure the amplitudes become greater with the fluctuations dominated by hardening.Such deformation fluctuations of granular materials should originate primarily from breaking and readjustment of its local bite structures.关键词
水工材料/细观机理/三轴数值试验/不破碎颗粒材料/颗粒流方法Key words
hydraulic materials/micro mechanism/triaxial numerical tests/uncrushed granular materials/particle flow method分类
建筑与水利引用本文复制引用
王小波,徐文杰,张丙印,丁秀丽..不破碎颗粒材料三轴数值试验的模拟[J].水力发电学报,2012,31(6):208-213,222,7.基金项目
国家973计划项目 （）
国家自然科学基金资助项目 （）
水利部公益性行业科研专项 （）
