Large-scale Triaxial Tests of Dense Gravel Material at Low Confining Pressure
Large-scale Triaxial Tests of Dense Gravel Material at Low Confining Pressure
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DOI：
10.1016/j.sandf.2013.12.005
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发表时间：
2014-02
期刊：
影响因子：
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通讯作者：
S. Lenart;J. Koseki;Takeshi Sato;Y. Miyashita;H. Thang
中科院分区：
文献类型：
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作者：
S. Lenart;J. Koseki;Takeshi Sato;Y. Miyashita;H. Thang
本文描述了对高度为50 cm、截面为23 cm×23 cm的致密棱柱状砾石试件进行的一系列大型三轴试验的结果。在最佳含水量下，试样的密度约等于最大密度的95%。使用垂直和水平局部变形传感器在局部测量变形。采用选定的极低围压水平的应力条件来模拟公路和铁路路堤的具体情况。特别要注意的是顶部和底部两端的垫层误差，以及将传感器固定在膜上以在低围压下使用。围压采用真空方式，范围为10kpa ~ 75kpa。非饱和试件在排水三轴压缩条件下进行了频率为0.5 ~ 5hz的单调和循环加载试验。研究了大载荷循环次数和试件预压的影响。
The results of a series of large-scale triaxial tests performed on dense, prismatic gravel specimens, with a height of 50 cm and a cross-section of 23 cm×23 cm, are described. The specimens were prepared at a density equal to approximately 95% of the maximum density at the optimum moisture content. Deformations were measured locally using vertical and horizontal local deformation transducers. Stress conditions with selected levels of very low confining pressure were used to simulate specific conditions in the case of road and railway embankments. Particular attention was paid to the bedding error at the top and the bottom ends of the specimens, and to fixing transducers onto the membrane to be used under low confining pressure. The confining pressure was applied by vacuum and varied from 10 kPa to 75 kPa. Unsaturated specimens were tested under drained triaxial compression using monotonic and cyclic loading with frequencies in the range of 0.5–5 Hz. The effects of a large number of load cycles and of specimen preloading were investigated.