路堤下河滩相软土地基变形研究

为总结河南省焦作至巩义黄河公路大桥连接线路堤下河滩相软土地基变形规律 ,保证工程质量 ,该工程选取 1 4个观测断面 ,采用沉降板和测斜导管 ,对填筑期和预压期软土地基进行了两年多的变形观测 ,获取有关数据 2万多个。根据观测结果并结合该软土地基特点 ,分析了河滩相软土地基的主要变形规律 :填筑期软土地基沉降较大且与荷载为线性关系 ;预压期沉降与时间符合双曲线关系。浅层型、夹层型和深层型软土地基表现出 3种不同的水平位移规律。根据沉降规律 ,计算并得出该软土地基可以不设预压期的结论。

Study of deformation of alluvial flat soft clay foundation under embankment

To seek the deformation features of the alluvial flat soft clay foundation under embankment and guarantee project quality,14 representative sections are selected on Jiaozuo Gongyi Yellow River bridge joint road that is built on the alluvial flat soft clay foundation in Henan province. By using inclinometer tubes and settlement plates,the field observation has been conducted for more than two years from the filling term to precompression term and more than twenty thousand data are obtained. By analyzing these data and the characteristic of alluvial flat soft clay foundation,the main deformation features of alluvial flat soft clay foundation are summarized.In the filling term,the settlement of alluvial flat soft clay foundation is comparatively large and in linear relationship with the load. In pecompression term,the settlement with time goes well with hyperbolic relationship. Shallow, sandwich and deep layer type soft clay foundation have different regular patterns of horizontal displacement. According to the settlement feature and calculation, the precompression term is not needed in the alluvial flat soft clay foundation.