黄土路基工后沉降预测模型对比研究  

Contrast Study on Prediction Models of Settlement of Loess-fill Subgrade after Construction

作　　者：王丽琴[1] 靳宝成[2] 杨有海[1] 贾文君[1] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]中铁第一勘察设计院集团有限公司,陕西西安710043

出　　处：《铁道学报》2008年第1期43-47,共5页Journal of the China Railway Society

基　　金：铁道部科技研究开发计划项目(2004G029)

摘　　要：工后沉降是造成路基沉降变形的主要原因,研究路基工后沉降的规律并预测最终沉降量对工程设计具有重要意义。利用兰武二线黄土路基工后沉降的长期观测数据,提出一种新的分析预测模型——似固结模型,并与泊松模型、指数模型、对数模型、双曲线模型的预测结果进行对比分析。结果表明:双曲线模型与似固结模型的误差平方和与预测曲线的误差均较小,能较好地反映黄土路基工后沉降的规律,两者相互印证,提高了工后沉降预测的可靠度。利用各种预测模型对不同测点工后沉降进行预测分析后的对比研究表明,似固结模型对黄土路基工后沉降的预测有较广泛的适用性,研究结论对于黄土地区铁路建设具有一定的借鉴意义。Post-construction settlement accounts for major subgrade settlement deformation, so it is important in engineering design to study the law of post-construction settlement and predict its ultimate settlement amount. Based on the long-term monitoring data of post-construction settlement of the loess subgrade of the LanzhouWuwei Line Ⅱ , the quasi consolidation model was set up and contrasted with other models such as the Poisson model, index model, logarithm model and hyperbolic model. The results show that the prediction errors of the variance and curve shape between the quasi consolidation model and hyperbolic model are small and with the verification of the hyperbolic model, the quasi consolidation model can give a better prediction of post-construction settlement of the loess subgrade. The contrast study on the post-construction settlement at different monitoring points of the various prediction models shows that the quasi consolidation model is more widely applicable to post-construction settlement prediction of the subgrade in loess areas. The conclusions have reference value to railway subgrade construction in loess areas.

关 键 词：工后沉降 泊松模型 指数模型 对数模型 双曲线模型 似固结模型 预测 

分 类 号：U416.1[交通运输工程—道路与铁道工程]