考虑颗粒级配影响的碎石料大型直剪试验研究  

Large-Scale Direct Shear Test Study of Crushed Stone Considering the Influence of Particle Gradation

作　　者：胡仁桂 Hu Rengui

机构地区：[1]江苏省建工建材质量检测中心有限公司,江苏南京210008

出　　处：《江苏建材》2024年第1期33-35,共3页Jiangsu Building Materials

摘　　要：文中针对不同初始颗粒级配的碎石材料开展了大型直剪试验,试验结果表明,增大细颗粒含量会导致碎石材料的内摩擦角逐渐减小;此外,碎石材料的抗剪强度具有非线性特点,其内摩擦角会随着法向应力增大而逐渐减小。在此基础上,文中提出新的非线性强度准则以描述碎石材料的抗剪强度,取得了良好的拟合效果,该强度准则在实际工程中具有广泛的应用前景。The grain gradation will change the shear strength of the gravel material,which will affect the bearing capacity of the ballasted track roadbed.In this paper,large-scale direct shear tests are carried out for different initial particle sizes of crushed stone materials.The test results show that the internal friction Angle of crushed stone materials decreases gradually with the increase of fine particle content.In addition,the shear strength of crushed stone material is nonlinear,and its internal friction Angle decreases with the increase of normal stress.On this basis,a new nonlinear strength criterion is proposed to describe the shear strength of crushed stone materials,and good fitting results are obtained.The strength criterion has a wide application prospect in practical engineering.

关 键 词：级配曲线 碎石料 抗剪强度 

分 类 号：TU521.25[建筑科学—建筑技术科学]