堆载预压下天津滨海吹填土的固结特性

吹填造陆已成为沿海地区解决土地匮乏的有效方法。为使吹填土迅速排水固结以缩短工期，以天津滨海新区的吹填土为研究对象，在无外力自重固结下，通过静水沉降以及室内试验等方法研究吹填土的基本性质和沉降特征，并对固结度、沉降速率进行定量分析，评价吹填土的固结程度，得出天津吹填土的固结和沉降特性。结果表明: 等幅水头逐级加压在一定程度上有效地抑制了低渗透性土体即“泥皮”的形成; 当水头高度为45 cm 时，土体固结度接近100%; 距离排水管越近，固结情况愈好; 堆积荷载增大，渗流速率变小，土体趋向固结。

Consolidation properties of dredger fill under surcharge preloading in coast region of Tianjin

Dredger fill making roads is an effective way to solve the land shortage in coastal areas.In order to quicken drainage consolidition and shorten the construction period of dredger fill,taken the dredger fill in coast region of Tianjing as studied object,the basic properties and subsidence characteristics of dredger fill in Tianjin were studied by water subsidence and laboratory tests without external force self-weight consolidation.The consolidation and subsidence characteristics of dredger fill in Tianjin has been obtained through the quantitative analysis of the consolidation degree and velocity,and its evaluation.The results showed that the graduated compression constant amplitude waterhead inhabited the formation of low permeability soil to some extent.The consolidation degree closed to 100% when the waterhead was 45 cm.The consolidation degree was better with the closer distence from drain.The permeability decreased and the soil tended to consolidation when the accumulation load increased.