结构性吹填软土流变等时曲线研究

软土普遍存在结构性,结构性影响土体各种力学行为。对天津滨海新区结构性吹填软土进行三轴流变试验,通过对比分析原状土与重塑土流变等时曲线发现,结构性吹填软土流变等时曲线可分离为线性粘弹性变形、线性粘塑性变形与非线性粘塑性变形。在应力小于结构屈服应力时,流变等时曲线线刚度大;超过结构屈服应力时,伴随着土结构的破损,流变等时曲线线刚度逐渐减小,最终趋于一定值,与重塑土接近。结构性对流变等时曲线的影响主要集中在线弹性阶段,进入塑性阶段后影响较小。 

Rheological isochronous curve of the structural soft dredger fill

Soft soil has structural characteristics which affect its mechanical behavior. In this paper, triaxial rheological test was conducted for structural soft dredger fill in Tianjin Binhai new area. Through comparative analysis of undisturbed and remolded soil rheological isochronous curve we knew that the rheological isochronous curve of the structural soft dredger fill can be divided into linear visco-elastic behavior, linear visco-plastic deformation and nonlinear visco-plastic deformation. When stress is less than structure yielding stress, rheological isochronous curve linear rigidity is larger; conversely, with the soil structure damaged, it turned to smaller, finally tended to be a certain value approaching to remolded soils. The structure affects rheological isochronous curve is mainly in linear elastic stage and smaller in plastic stage.