黄土路基沉降曲线特征分析

Analysis of characteristics of settlement curve of loess roadbed

在分析郑西客运专线试验段路基沉降实测资料的基础上,提出沉降变形常规预测方法受观测时间及单次观测结果的影响比较大,不利于用来预测最终沉降。通过分析现场沉降变形与时间关系曲线,提出路基沉降的发展主要受固结的影响,其发展是一个从沉降增加到趋缓的过程,可以明显分为固结变形及流变变形,并用非饱和土等效固结理论加以解释,提出了一种利用s-t曲线特征预测最终沉降量的方法,经检验对比发现其预测结果受观测时间及单次观测结果的影响比较小,优于其它常规预测方法。

The article puts forward that the observation time and single observation result have large effects on the final settlement which is predicted by conventional forecasting methods based on analyzing Zhengzhou-Xi'an passenger dedicated line test section subgrade settlement.As a result,predictive value may not real value.The article puts forward that the development of subgrade settlement is an easing up process.It can be significantly divided into consolidation deformation stage and rheological deformation stage based on the bases of analyzing subgrade settlement deformation curve.The viewpoint can be explained by equivalent consolidation theory.The article puts forward the method for predicting final settlement according to s-t curve characteristics.The practice shows that the observation time and single observation result have very small effects on the final predict settlement.It is better than any other methods.