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通过4组不同膨润土与水泥掺比(0.93,0.50,0.35,0.26)的塑性混凝土常规三轴压缩试验,研究了膨润土与水泥掺比对塑性混凝土变形特性(割线模量、峰值应变、体积变形、模强比)的影响规律。试验结果表明,随着膨润土与水泥掺比的降低,塑性混凝土峰值应变和最大体积压缩量均显著降低,即材料抗裂性和变形性能显著降低。膨润土与水泥掺比对模强比的影响规律不一致,膨润土与水泥掺比为0.93或0.50时,塑性混凝土模强比有随围压增加而先增后降的趋势;膨润土与水泥掺比为0.35或0.26时,塑性混凝土模强比表现为随围压增加而逐渐降低的趋势。最后,根据三轴试验结果整理分析了符合Duncan-Chang本构模型的塑性混凝土本构参数。
The deformation characteristics (secant modulus, peak strain and volume deformation) of plastic concrete were studied by conventional triaxial compression tests of 4 different bentonite-cement mixed concrete (0.93,0.50,0.35,0.26) plastic concrete. , Modulus ratio) the impact of the law. The experimental results show that with the decrease of the mixing ratio of bentonite to cement, the peak strain and the maximum volumetric compression of plastic concrete are significantly reduced, that is, the material’s crack resistance and deformation performance are significantly reduced. The influence of bentonite to cement ratio on the modulus ratio is inconsistent. When the ratio of bentonite to cement is 0.93 or 0.50, the modulus ratio of plastic concrete first increases and then decreases with the increase of confining pressure. The mixing ratio of bentonite to cement is 0.35 Or 0.26, the plastic concrete modulus ratio showed a trend of decreasing gradually with the increase of confining pressure. Finally, according to the triaxial test results, the constitutive parameters of plastic concrete conforming to Duncan-Chang constitutive model are analyzed.