吹填淤泥自重沉积物理力学性质变化特征

吹填淤泥自重沉积阶段物理力学性质具有时空变异特征.通过对某围海造陆区吹填后淤泥自重沉积阶段物理力学性质的测试分析,对吹填淤泥的物理力学性质沿土层深度及自重沉积时间的变化特征进行了分析,结果表明:1)吹填淤泥的含水量(孔隙比)沿深度减小,变异性沿深度增加,强度沿深度明显增加,具有较大的变异性,应考虑变异性对选取土性指标的影响;2)吹填淤泥的含水量(孔隙比)在吹填施工完成前两个月减小速率很快,特别是表层1 m淤泥减小速率最显著,与相邻中间层淤泥层差距逐渐增大,两个月后整个吹填淤泥层进入缓慢失水状态.

Variation Characteristics of Physical and Mechanical Properties for Dredged Fill during Self-weight Sedimentation Stage

The physical and mechanical properties of dredged fill has a characteristics of spatial and temporal variability during self-weight sedimentation. The physical and mechanical properties test for dredged fill is conducted after dredging on a basis of reclamation land project, and variation characteristics of the physical and mechanical properties tests for dredged fill with the depth and self-weight sedimentation time were analyzed. The analytical results are shown： 1）The water content （void ratio）of dredged fill decreases with the depth, its variability increases with the depth,and the strength of dredged fill increases with the depth,with greater variability behavior, which should be considered the influence of variability behavior of physical and mechanical properties on the selection of soil index. 2） The water content （void ratio） of dredged fill decreases rapidly in the first two months after completion of dredging construction, especially has a significant decrease on the surface 1 m depth. With time increases, the larger difference of physical and mechanical properties of dredged fill between the surface and the adjacent middle layer, and dredged fill layer begin to entry into a slow loss water state.