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基于塑性混凝土立方体试件的双轴压缩试验,研究了塑性混凝土的双轴受压性能和破坏准则。结果表明:当应力比较小时,塑性混凝土双轴受压破坏形态与单轴受压相似;随应力比增加,双轴受压破坏面龟裂现象明显;双轴受压下的塑性混凝土抗压强度显著提高,是单轴抗压强度的1.77~4.72倍;随应力比的增大,塑性混凝土抗压强度先增大后减小,应力比0.75时抗压强度的提高最大;单轴抗压强度越高,双轴受压时塑性混凝土抗压强度的增长越小。塑性混凝土八面体正应力应变曲线、剪应力应变曲线的斜率随应力比的增加有增大的趋势,其变形随抗压强度的增加有所降低。双轴受压各应力比下的八面体剪应力与正应力之间均具有线性关系,其斜率随应力比的增加逐渐降低。通过对试验结果的分析,建立了双轴受压下塑性混凝土抗压强度的包线方程以及双参数、三参数及考虑加载路径影响的破坏准则。
Based on the biaxial compression tests of plastic concrete cube specimens, the biaxial compression properties and failure criteria of plastic concrete were studied. The results show that when the stress is relatively small, the failure modes of biaxial compression of plastic concrete are similar to those of uniaxial compression. The cracking of biaxial compression failure surface is obvious with the increase of stress ratio. The compression strength of plastic concrete under biaxial compression Which is 1.77 ~ 4.72 times that of uniaxial compressive strength. With the increase of stress ratio, the compressive strength of plastic concrete first increases and then decreases, and the maximum increase of compressive strength when the stress ratio is 0.75. The uniaxial compressive strength The higher the plastic biaxial compressive strength of plastic concrete increases. Plastic concrete octahedron normal stress strain curve, the slope of shear stress strain curve tends to increase with the increase of stress ratio, the deformation decreases with the increase of compressive strength. The biaxial shear stress and normal stress under each stress ratio of biaxial compression have a linear relationship, the slope of which decreases with the increase of stress ratio. Based on the analysis of test results, the envelope equation of compressive strength of plastic concrete under biaxial compression and the failure parameters of two parameters and three parameters and the influence of loading path are established.