塑性混凝土立方体和圆柱体试件的力学特性数值模拟研究

Numerical simulation study on mechanical properties of plastic concrete cube and cylinder specimens

为研究塑性混凝土立方体和圆柱体试件力学特性的差异,采用FLAC3D有限差分软件模拟了塑性混凝土单轴压缩试验,数值模拟得到的塑性混凝土单轴应力-应变关系与试验结果基本一致,说明采用FLAC3D开展塑性混凝土力学特性数值分析是可行的。在此基础上,分别开展了立方体和圆柱体塑性混凝土试件的三轴试验数值模拟,获得了塑性混凝土试件应力-应变曲线、峰值强度和峰值应变,并分析了两种试件位移云图。研究表明在相同参数下立方体试件峰值强度普遍比圆柱体试件偏大,峰值强度随着围压近似线性增长。

In order to study the differences in mechanical properties between plastic concrete cubic and cylindrica1 specimens,FLAC3D finite difference software was used to simulate the uniaxial compression test of plastic concrete.The stress--strain re1ationship of plastic concrete obtained from numerical simulation was basically consistent with the experimental results,indicating that using FLAC3D to carry out numerical analysis of plastic concrete mechanical properties was feasible.Based on this,the triaxial test numerical simulation of p1astic concrete specimens in cubic and cy1indrica1 shapes was carried out respectively.The stress-strain curves,peak strength and peak strain of plastic con-crete specimens were obtained,and the displacement c1oud maps of the two specimens were analyzed.The study showed that under the same parameters,the peak strength of the cubic specimens was genera1ly higher than that of the cylindrical specimens,and the peak strength increased linear1y with confining pressure.