河道淤泥气泡混合轻质土剪切流变特性及模型

利用剪切流变试验对以水泥为固化剂的河道淤泥气泡混合轻质土的流变特性进行了试验研究。试验结果表明，经固化处理的河道淤泥气泡混合轻质土在荷载作用下具有类似于硬粘性土的流变特征。剪切流变可以分为3个阶段：在剪应力水平较低时，剪切流变曲线呈衰减稳定型；随着剪应力水平的提高，剪切流变曲线呈非稳定的等速型；当剪应力水平增大到一定程度时，剪切流变曲线呈加速型。河道淤泥气泡混合轻质土的流变性随着混合轻质土强度的提高而降低。根据试验所呈现的剪切流变规律，可以发现河道淤泥气泡混合轻质土的剪切流变符合七元件黏弹塑性剪切流变模型，模型能够比较好地描述河道淤泥混合轻质土在各种剪应力水平下的衰减、等速以及加速流变过程。

Shear rheological properties and modelling of air foamed lightweight soil using river sludge

The rheological properties of river sludge mixed with cement and air foam were studied by shear rheological test. The test results showed that under the load the mixed lightweight soil by curing process was similar to the rheological characteristics of hard clay. The soil rheological curve of air foamed soil using river sludge mainly presented three models. When the shear stress level was low, the theological curve appears as attenuation stable; When the shear stress levels continued to increase, the form of the rheological curve was not stable but constant speed type; When the shear stress increased to a certain extent, the rheological curve type was accelerated. With the improvement of the strength of the mixed lightweight soil, the rheological properties of river sludge mixed with cement and air foam is reduced. According to the test, the mixed lightweight soil shear rheological conformed to the seven-component visco-elastoplastic shear rheological model. Using the model can reasonably and reliably describe the rheological process include attenuation, velocity and acceleration of the mixed lightweight soil under various shear stress levels.