基于Burgers模型铁路路基长期沉降的预测分析  

Prediction and Analysis of Long-term Settlement of Railway Subgrade Based on Burgers Model

作　　者：王威 杨文豪 杨成忠[1] 冯青松[1] WANG Wei;YANG Wenhao;YANG Chengzhong;FENG Qingsong(Engineering Research Center of Railway Environment Vibration and Noise, Ministry of Education, East China Jiaotong University, Nanchang 330013, China)

机构地区：[1]华东交通大学铁路环境振动与噪声教育部工程研究中心,江西南昌330013

出　　处：《铁道学报》2020年第12期142-149,共8页Journal of the China Railway Society

基　　金：国家自然科学基金(51908215);江西省自然科学基金(20181BAB216030);江西省教育厅科学技术研究(GJJ170399);江西省高等学校科技落地计划(KJLD14038)。

摘　　要：为丰富铁路路基沉降变形预测方法,弥补传统预测方法所存在的不足,基于Burgers模型,在充分考虑铁路填筑及列车运营期间路基土所处的空间应力状态和蠕变变形特性的基础上,将任意路基土体单元的主应力差表达式展开,分别推导了Maxwell模型和Kelvin模型的沉降变形方程,从而建立了基于Burgers模型预测铁路路基长期沉降变形方程。进一步地,利用现有文献研究成果及实测数据,分别验证了本模型预测路基土在填料堆载和列车荷载作用下的沉降变形规律。结果表明:模型能够反映路基土在填料堆载及列车荷载作用下沉降量随时间的变化呈先快后慢,最终趋于稳定的增长规律,模型参数均在合理范围内且预测结果可靠性较高,研究成果可为相关工程提供一定参考。In order to enrich the prediction methods of settlement deformation of the railway subgrade and make up for the deficiency of traditional prediction methods,after full consideration of the three-dimensional stress state and creep deformation characteristics of subgrade soil while in the process of filling construction and train operation,the settlement deformation equations of Maxwell model and Kelvin model were derived respectively by expanding the expression of principal stress difference of random subgrade soil unit.As a result,the long-term settlement deformation equation of railway subgrade based on Burgers model was established in this paper.Furthermore,the existing literature research results and the measured data were separately used to verify the settlement and deformation law of subgrade soil under heaped load and train load.The results show that the deformation law of the subgrade soil reflected in the model is that the settlement of the roadbed soil increases fast first and then slowly with time,and tends to a stable value finally under the action of embankment heaped filler and train load.The predicted results of the model have high reliability with the parameters within a reasonable range,which can provide certain reference for related projects.

关 键 词：铁路路基 列车荷载 沉降预测 BURGERS模型 

分 类 号：U213.1[交通运输工程—道路与铁道工程]