卵石粗粒土变形模量和剪胀角预测方法研究  

Prediction of Deformation Modulus and Dilation Angle of Coarse-Grained Material Under Different Confining Pressures and Soil Densities

作　　者：周瑞荣[1] ZHOU Ruirong(College of Civil Engineering,Sanjiang University,Nanjing 210012,China)

机构地区：[1]三江学院土木工程学院,南京210012

出　　处：《现代交通技术》2018年第3期1-4,13,共5页Modern Transportation Technology

基　　金：国家自然科学基金(51009147)

摘　　要：针对某级配的砂卵石料,对不同密度试样开展大量的常规三轴固结排水剪切试验,探讨了围压和制样初始密度对粗粒土变形特性和强度特性的影响。研究结果表明:粗粒土变形模量与围压基本呈线性关系。而变形模量随着密度增加或孔隙比降低,以递增的速率增长。通过引入孔隙比方程,建立了不同围压和密度下卵石粗粒土变形模量的预测方法。采用考虑围压和密度影响的剪胀指数,建立了预测卵石粗粒土最大剪胀角的方法。剪胀指数与最大剪胀角具有很好的线性关系。一旦获取土体所受的有效应力和密度,此方法可预测不同围压和密度下卵石粗粒土的变形模量和最大剪胀角。Extensive triaxial consolidation drained shear tests were conducted to investigate the influence of confining pressure and soil density on the deformation and strength of coarse-grained soil. The results of research show that the Young＇s modulus of coarse-grained soil has a linear relationship with the confining pressure,while the modulus increases as an increase in soil density. By incorporating void ratio function,prediction of the Young＇s modulus varying with confining pressure and density is established. Via a dilatancy index,calculation of the maximum dilation angle under different confining pressures and densities is proposed. The maximum dilation angle has a linear relationship with the dilatancy index. With known the confining pressure and soil density,the proposed methods can directly estimate the Young＇s modulus s and dilation angle of coarse-grained soils.

关 键 词：粗粒土 三轴试验 密度 围压 变形模量 剪胀角 

分 类 号：TU432[建筑科学—岩土工程]