项目名称: 既有铁路有改良层过渡段结构-构造特性及其动力响应研究
项目编号: No.51208198
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 建筑环境与结构工程学科
项目作者: 赵秀绍
作者单位: 华东交通大学
项目金额: 25万元
中文摘要: 既有铁路提速改造是高速铁路建设的一部分。既有铁路提速时,解析路桥过渡段有改良层路基运营后的特殊结构-构造特性,路基中动-静应力场分布是提速改造的前提。但是经典的理论只能对均质路基的变形进行计算,一些能够体现结构-构造对矢量场影响的解析方法只能用于新建铁路路基应力、变形计算,不能反映既有铁路过渡段特殊结构-构造特性的影响。本项研究采用现场原型试验,探索多年运营后过渡段的结构-构造特性。基于层状粘弹性体系和改良土结构损伤理论,建立复柔量表征应力-应变关系的本构方程,在数值仿真模型中加入新构造的影响特性,全面解析新构造作用下路基中动静应力-应变场分布,分析产生新构造的机理和预测新构造的发展。基于已构建的轨道-道床-路基数值模型进行扩展,把新构造作用下轨道的动参数测试数据作为输入,分析提速后轨道的动力响应,反演分析有改良层过渡段路基的临界控制指标,为过渡段路基评价和加固改造提供技术依据与标准。
中文关键词: 既有铁路;路桥过渡段;动力学模型;结构-构造特性;临界控制指标
英文摘要: Existing railway reconstruction for high speed is part of the high speed railway construction. While reconstruction in bridge transition section with improvement layer, the analysis of special structure- tectonic characteristics, dynamic-static stress field distribution and critical control indicators are the base for speed up. However, the classical theory can only calculate the stress and deformation of homogeneous subgrade; some analytic methods can reflect the impact of structure-tectonic, which can only be used to calculate stress-deformation for new construction railway subgrade and not for existing railway. The study exploring structure-tectonic characteristics in existing railway after many years operation with field prototype test. A complex-compliance constitutive equation will be established based on layered visco-elasticity system and improved soil structure damage theory, the dynamic stress-strain field in bridge transition section will be comprehensive analyzed in numerical simulation model by adding tectonic effect characteristics. The new structure-tectonic mechanism will be analyzed and new structure-tectonic development will be predicted combine with the analysis of weathering characteristics on road shoulder. Finite element model will be expanded based on the track-trackbed-subgrade finite ele
英文关键词: Existing railway;Road-bridge transtion secition;Dynamic model;Structure-tectonic characteristics;Critical control indicator