黄土路堤工后沉降预测新模型与方法

路堤的工后沉降是在黄土地区修建高标准铁路的主要问题之一,利用黄土路堤工后沉降的实测数据,找出其相应的工后沉降规律将有利于指导设计与施工。在分析了大量的兰武二线铁路黄土路堤工后沉降的实测数据的基础上,提出了一个新模型。为了检验新模型,运用常用的双曲线模型和指数模型分别对相同的实测数据进行了分析预测,并通过对比分析得出了不同的分析和预测结果。研究结果表明:新模型预测的误差小,与实测数据的吻合较好。新模型为工后沉降的分析预测提供了一种新的方法,可为今后黄土路堤工后沉降的预测计算提供参考。

NEW MODEL AND METHOD FOR FORECASTING POST-CONSTRUCTION SETTLEMENT OF LOESS-FILL EMBANKMENTS

Post-construction settlement is one of the main issues in high grade railway construction in loess areas. The effective solution to the problem is to find the post-construction settlement law for the guidance to the design and construction based on the field monitored data. After analyzing the large quantities of monitored data from the second line of Lanzhou--Wuwei Railway in loess areas, a new model is put forward. The hyperbolic and exponential models usually used as prediction were also applied to the forecasting settlements based on the same monitored data with the presented new model. The results show that the prediction error is smaller than that with usual models~ and the forecasting data agree well with the monitored data. The new model presents a new method for analysis and prediction of settlement and it is found to be a good reference to post-construction settlement of embankment in loess areas.