岩土工程学报2016，Vol.38Issue(8)：1357-1364,8.DOI:10.11779/CJGE201608001
考虑级配和颗粒破碎影响的堆石料临界状态研究
Critical state of rockfill materials considering particle gradation and breakage
摘要
Abstract
The theories of critical-state soil mechanics are satisfactory in describing the stress-strain characteristics of fine-particle soils and have become the foundation for establishing various constitutive models for clay and sandy soils. As for rockfill materials, under the influences of some factors such as stress, density and gradation, their deformation characteristics are very complex, and their particles are easily broken under high stress. Whether there exists the only critical state or not is worthy of being discussed. Through a series of large-scale triaxial shear tests on rockfill specimens with different gradations and densities under different confining pressures, the critical state of the rockfill materials and the influencing factors are investigated. The test results show that, under different gradations, densities and initial consolidation stresses, when the shear strain is large, the specimens all tend tobe inthe critical state, and the values of thecritical state relate to the initial density, gradation and particle breakage.And in theq–p¢ plane, there exits the only critical stress ratioMfor rockfill materials. Then,in thee–a(p¢/p)x plane, the critical state lines are basically parallel, and their intercept can be directly obtained according to the initial density and gradation. A mathematical expression for the critical state of rockfill materials considering particlegradation andbreakage is proposed by comparing and analyzing the critical states of various rockfill specimens.关键词
堆石料/颗粒破碎/密度/级配/临界状态Key words
rockfill materials/particle breakage/density/gradation/critical state分类
建筑与水利引用本文复制引用
蔡正银,李小梅,韩林,关云飞..考虑级配和颗粒破碎影响的堆石料临界状态研究[J].岩土工程学报,2016,38(8):1357-1364,8.基金项目
国家自然科学基金项目 （）
