单级配堆石料力学性质和变形特征的研究  

Mechanical Properties and Deformation Characteristics of Single Graded Rockfill Materials

作　　者：李存柱 曹苏茜 Li Cunzhu;Cao Suqian(Jiangsu Coal Geological Geophysical Prospecting Measure Team,Nanjing 210000,Jiangsu,China;Nanjing Tap Water General Company,Nanjing 210000,Jiangsu,China)

机构地区：[1]江苏煤炭地质物测队,江苏南京210000 [2]南京水务集团有限公司,江苏南京210000

出　　处：《岩土工程技术》2024年第4期494-498,共5页Geotechnical Engineering Technique

摘　　要：颗粒级配是影响堆石料力学性质的主要因素之一,为研究单一级配堆石料的力学性质和变形特征,基于室内大型三轴试验,对单一级配的堆石料进行研究。结果表明:试样在密实状态下,剪切过程中不断发生剪缩现象,同时试样呈现应变硬化模型,与常规的级配良好的堆石料或者砂土材料呈现相反的规律;围压相同,且在轴向应变相同时,大粒径的堆石料剪缩效应弱于小粒径堆石料,而大粒径堆石料的偏应力大于小粒径堆石料的偏应力;单级配堆石料粒径大小对力学性质和变形特征会产生重要的影响。Particle gradation is one of the main factors that affect the mechanical properties of rock-fill materials.To study the mechanical properties and deformation characteristics of the rock-fill materials with single particle size,the large-scale triaxial test and numerical simulation of particle flow were conducted.The main results are as follows:in the case of dense state,the shear contraction of the sample occurs,and the specimen presents the strain hardening model,which shows the opposite rule of the conventional coarse aggregate or sand materials.When the confining pressure is same,and axial strain is identical,the shear contraction of grain with small particle size is more obvious than that of large particle size.When the condition is the same,the deviatoric stress of large particle is larger than small particle's.At the same time,it is found that the particle size of the single graded rockfill materials will have an important influence on its mechanical properties and deformation characteristics.

关 键 词：单一级配 堆石料 大型三轴试验 剪缩效应 

分 类 号：TU41[建筑科学—岩土工程]