基于指数法的分级填筑路堤沉降预测方法研究

SETTLEMENT PREDICTION OF STAGE-CONSTRUCTED EMBANKMENT ON SOFT GROUND USING THE EXPONENT FITTING METHOD

在传统指数曲线拟合法基础上,提出一种软土地基上路堤分级施工情况下沉降预测新模型。该模型考虑了土体变形的非线性和固结性质随荷载的变化,将沉降拟合方程中的待定参数在两个不同荷载级中分别确定:利用有较长预压期的前一级实测沉降确定与土的固结性质有关的参数,其它参数则由需预测沉降荷载级中较短预压期内实测沉降确定。工程实例表明,本文模型预测的沉降与实测值有很好的一致性,可实现沉降的及早预测。

Stage construction is a typical procedure for expressw ay embankments on soft ground. Based on the traditional exponent fitting method, a new model for prediction o f settlement of stage-constructed embankment on soft ground is presented. In the model, soil deforms no nlinearly, and its consolidation properties vary with the magnitude of the load.Among the three model parameters to be determined, two of them which relation to the c onsolidation properties of the su bsoil are determined by using the settlements measured at the preceeding stage with longer preloading duration,an d the third parameter is determined by using the settlements measured in short preloading period at the stage that settlement p rediction is to be performed.A case study shows the predicted settlements are fa irly consistent with the measured settlements.