中南大学学报（自然科学版）Issue(10)：3879-3887,9.DOI:10.11817/j.issn.1672-7207.2015.10.043
质量密度及围压影响的堆积碎石土变形特性分析
Analysis of deformation characteristics ofeluvial gravel soil under mass density and confining pressure
摘要
Abstract
Considering the influence of mass density (the different stone content, moisture content) and confining pressure on gravel soil deformation characteristics, an experiment of gradation representative sample eluvial gravel soil of Zhaoshan Hunan province was carried out. The results show that the mass density and confining pressure have a combined effect. Gravel soil stress-strain curve under the different mass density shows as step-like, that is strain at first hardening then softening, strain softening for moisture content of 7%. With the increase of the confining pressure, the initial tangent modulus and shear peak value increase, but non-linear growth with the change of the mass density, the yield locus into parallel lines. Shear contraction under low confining pressure, the high confining pressure dilatation. The pressure-sensitivity of eluvial gravel soil is more sensitive to stone content, the shear dilatation is more sensitive to moisture content, and there are optimum moisture content and the best stone content. Dilatancy rate andeffective stress ratio can be a judgment of the dilatancy property. Also volumetric strain is found on different mass density and confining pressure are mainly concentrated in two curves. It can be a judgment for landslide failure after continuous heavy rainfall.关键词
滑坡/碎石土/质量密度/压硬性/剪胀性Key words
landslide/gravel soil/mass density/pressure-sensitivity/shear dilatation分类
建筑与水利引用本文复制引用
董辉,胡自然,傅鹤林,陈铖,陈玺文..质量密度及围压影响的堆积碎石土变形特性分析[J].中南大学学报（自然科学版）,2015,(10):3879-3887,9.基金项目
国家自然科学基金资助项目(51108397)(Project (51108397) supported by the National Natural Science Foundation of China) （51108397）
