高速铁路无砟轨道路基长期动力稳定性及基于极限状态法的设计方法研究

项目名称： 高速铁路无砟轨道路基长期动力稳定性及基于极限状态法的设计方法研究

项目编号： No.U1234204

项目类型： 联合基金项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 陈仁朋

作者单位： 浙江大学

项目金额： 270万元

中文摘要： 本项目以高速铁路无砟轨道路基的长期动力稳定性和变形问题为工程背景，对路基各个结构层填料在列车动载和环境荷载耦合作用下的长期动力行为展开多尺度的试验研究，获得其在不同荷载条件和环境状态下的细观行为机理和宏观发展规律；建立路基长期动强度、刚度衰减规律以及累积沉降的分析理论和计算方法；通过足尺的物理模型试验研究路基各结构层协同作用机理和路基变形、刚度变化规律，结合轨道-路基耦合动力模型，对路基刚度和强度进行优化设计。最后，通过参数概率和数理统计分析，建立路基长期动强度以及累积沉降的极限状态方程，基于可靠度理论，得到路基结构各极限状态全生命周期内的可靠度指标和分项系数。本项目研究将为我国目前急需的基于极限状态的高速铁路路基理论和设计方法提供科学依据，为我国高速铁路无砟轨道路基的设计、建设以及后期路基状态的评估和维护提供可靠的科学指导，具有重大理论价值和实践意义。

中文关键词： 高速铁路；无砟轨道路基；动力稳定性；极限状态法；设计方法

英文摘要： The proposal is focused on the existing engineering problems of long-term dynamic stability and deformation of ballastless track subgrade of high-speed railways. Multi-scale experiments will be conducted on long-term dynamic behavior of subgrade fillings under the coupling between train loads and environmental loads, thus the micro- behavior mechanism and macro-development law could be acquired. Then establish the analysis theories and calculation methods of long-term dynamic strength, stiffness attenuation law and accumulative settlement. The full-scale physical model tests are conducted in order to reflect the real behavior of interaction of different subgrade layers and the develop law of subgrade stiffness and deformation. With the combination analysis of track-subgrade coupling dynamic model, optimization design methods of subgrade will be proposed. Finally, set up the limit state equations of long-term dynamic strength and accumulative deformation with the theories of probability parameters and mathematical statistics. The reliability indexes and partial factors of each limit states of high-speed railway subgrade could be obtained through reliability theory. This program will provide scientific basis for making better understanding of subgrade theories and design methods based on the limit state design phi

英文关键词： High-speed railway；Ballastless track subgrade；Dynamic stability；Limit states；Design method