无砟轨道路基基床的动态特性  

Dynamic Characteristics of Soil Subgrade Bed for Ballastless Track

作　　者：蒋关鲁[1] 孔祥辉[1] 孟利吉[1] 王智猛[1] 

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031

出　　处：《西南交通大学学报》2010年第6期855-862,共8页Journal of Southwest Jiaotong University

基　　金：国家博士点基金资助项目(20070613044);铁道部科技研究发展计划资助项目(2005K004-C(G))

摘　　要：为了研究路基变形模量及反力系数在弹性领域内的非线性特性,应用无砟轨道路基基床模型和现场试验,分析了在分级静载和分级循环加载条件下,降雨前、后基床的静态、动态特性.研究结果表明:无论是静态响应还是动态响应,在基床横断面方向上均呈马鞍形分布,混凝土基础板轨下位置响应最大,中线处和端部响应较小;在基床表层范围内,动态响应最为强烈,随深度的增加,在基床表层范围内衰减较快,在基床底层范围内衰减较慢;与降雨前相比,降雨后静应力的最大增量为12%左右、动应力的最大增量为3%左右、加速度的最大增量为35%、动位移的最大增量为13%左右,因此应充分重视路基的防排水措施.In order to study the nonlinear elastic properties of the deformation modulus and reaction coefficient of soil subgrade bed,a large-scale test model of ballastless track subgrade and a comprehensive field test were used to analyze the static and dynamic characteristics of the ballastless track subgrade before and after rainfall under step static and dynamic loading.The result indicates that along the transverse direction in the subgrade cross section,both the static response and dynamic response have a saddle-shaped distribution.The largest static response and dynamic response measured are under the concrete base slab at the track position,while the responses under the centre-line and two ends of the concrete slab are small.The most intense dynamic responses are measured in the surface layer of subgrade bed（graded gravel area）,and they reduce sharply with depth.Compared with before rainfall,the subgrade static stress,dynamic stress,acceleration,and dynamic deformation increased about 12%,3%,35%,and 13%,respectively,at most after rainfall.Therefore,sufficient emphasis should be placed on the waterproofing and drainage measures.

关 键 词：无砟轨道 路基基床 动态特性 模型试验 实车测试 

分 类 号：U169.6[交通运输工程]