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利用固结仪对南宁膨胀土进行了一维加载-卸载实验,得到了加载-卸载条件下的应力应变关系。试验结果表明,土样加载或卸载时,以瞬时变形为主,其后随着时间的推移,迅速出现衰减蠕变或回弹变形,但最后仍然留下部分残余变形;含水率和应力水平越高,其塑性和流变特性越明显。根据压缩曲线和回弹曲线分析得到,膨胀土的变形由瞬时弹性变形、瞬时塑性变形,弹性滞后变形等组成。探索了膨胀土流变元件模型的组成形式,并通过拟合确定了相关的流变参数.所得结果可供膨胀土流变问题的进一步研究参考。
The one-dimensional loading-unloading experiment of Nanning expansive soil was carried out by using the consolidation instrument, and the stress-strain relationship under loading-unloading condition was obtained. The experimental results show that the soil samples are mainly instantaneous deformation when they are loaded or unloaded, and then rapidly decline or rebound deformation with the passage of time, but in the end they still leave some residual deformation; the moisture content and the stress level are more High, the more obvious plasticity and rheological properties. According to the analysis of compression curve and springback curve, the deformation of expansive soil is composed of instantaneous elastic deformation, instantaneous plastic deformation and elastic hysteresis deformation. The composition of the rheological component model of expansive soil was explored, and the related rheological parameters were determined by fitting.The results are available for reference for further study of rheological behavior of expansive soil.