高填石路堤地基沉降计算方法研究

高填石路堤地基沉降受施工情况影响,填筑阶段和非填筑阶段地基沉降规律明显不同,因而不能采用统一的地基沉降与时间关系的表达式来描述地基各阶段沉降规律。填筑阶段,提出了能同时考虑剪切变形和压缩变形的修正的邓肯张模型来计算路基沉降;对非填筑阶段早期的地基沉降,采用与时间和固结压力有关的指数函数预测模型进行计算。通过对填筑阶段和工后早期的沉降计算,其计算结果均与实测值吻合良好。

Study on Settlement Calculation Method for Subgrade of High Rockfill Embankment

As the settlement for subgrade of high rockfill embankment is influenced by the condition of construction and the settlement regularity for subgrade during and after construction is obviously different,which could not be described by one expression for the relation betweeh the settlement and the time.A modification of DuncanChang model is presented to calculate the subgrade settlement during construction,taking into account of compression deformation and shear deformation.As for the early settlement of subgrade,it is described by negative exponential function,in which both time and consolidation pressure are considered.The computation results of the early settlement for the subgrade during construction and postconstruction are in agreement with the data from the onthespot survey.