高速铁路粗粒土路基长期累积变形机理及计算模型研究

项目名称： 高速铁路粗粒土路基长期累积变形机理及计算模型研究

项目编号： No.51508097

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 建筑环境与结构工程学科

项目作者： 王启云

作者单位： 福建工程学院

项目金额： 20万元

中文摘要： 高速铁路路基常采用粗粒土填筑,其长期累积变形控制与预测是高速铁路建造技术的难点，因此有必要对动静荷载耦合作用下粗粒土填料的变形机理和计算模型进行研究。本项目以粗粒土A、B组填料为研究对象，紧密结合高速列车荷载作用下路基动力学响应状态，综合运用模型试验和数值模拟试验方法，研究动静荷载作用下粗粒土填料动力累积变形和蠕变变形过程中颗粒破碎与迁移规律，揭示路基填料变形宏观与细观机理；定义能够反映粗粒土填料变形细观机理的变量，建立动力累积应变计算模型，完善已有的蠕变模型，通过耦合叠加，建立不同应力状态下考虑蠕变效应的粗粒土填料长期动力累积应变计算模型，依据应变连续性原理，构建高速铁路路基长期累积变形计算模型，深入分析列车荷载作用下路基变形时空演化规律，采用模型和现场测试结果对研究结论进行验证。研究成果可为高速铁路粗粒土路基变形控制提供理论依据和技术指导，具有良好的经济和社会效益。

中文关键词： 高速铁路；粗粒土填料；细观机理；累积变形；蠕变变形

英文摘要： Coarse-grained soils are usually used for subgrade filler of high speed railway and the long-term cumulative deformation control and prediction of the subgrade becomes the technical difficult problem in the high speed railway construction, so it’s necessary to reasearch deformation mechanism and calculation model of coarse grained filling under coupling static and dynamic loads.According to dynamic characteristics of subgrade of high speed railway,taking group A or B coarse grained soil as object of study,particle breakage and movement law of subgrade filling are profoundly investigated by applying model test and numerical modeling method in the process of accumulatively deforming and creeping, and the macroscopic and meso-scopic deformation mechanism of subgrade filling will be revealed. The variable can be defined ,which can reflect meso-scopic deformation mechanism of the coarse granular soil filling. The dynamic cumulative strain calculation model would be set up and creep model would be improved,and then the long-term dynamic cumulative strain calculation model would be proposed in consideration of creep effect by coupling strain model and creep model. By the principle of strain continuity, long-term cumulative deformation calculation model will be set up.Finally, spatial-temporal evolution law of subgrade deformation will be analysed deeply,and the conclusions of this project will be verified on the basis of the testing results.The research results of the subject can provide the theory basis and technological guidance for deformation control of coarse-grained soil subgrade of high-speed railway,and yield sound economic and social benefits.

英文关键词： high-speed railway;coarse grained soil filling;meso-scopic mechanism;cumulative deformation;creep deformation