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采用土体三轴流变仪,对南宁膨胀土在不同恒应变分级加载条件下的三轴应力松弛特性开展试验研究,探讨在不同恒应变水平下南宁膨胀土的应力松弛特征和松弛模量等变化规律。根据应力-应变等时曲线特征,研究南宁膨胀土在三轴压缩条件下的应力松弛特性。通过对试验结果的分析,建立可描述南宁膨胀土非线性应力松弛特性的经验模型。模型计算结果与试验结果吻合较好,验证了经验模型的可靠性。
The soil triaxial rheometer was used to study the triaxial stress relaxation characteristics of the expansive soils of Nanning under different levels of constant strain. The stress relaxation characteristics and relaxation modulus of Nanning expansive soils under different levels of constant strain The law of change. According to the characteristics of stress-strain isochron curve, the stress relaxation characteristics of Nanning expansive soil under triaxial compression are studied. Through the analysis of test results, an empirical model describing the nonlinear stress relaxation characteristics of Nanning expansive soils is established. The calculated results of the model are in good agreement with the experimental results, which verify the reliability of the empirical model.