荷载幅值对无砟轨道结构裂纹水压力影响  

Impact of Load Amplitude on the Water Pressure of Non-ballasted Track Structure

作　　者：徐桂弘[1] 杨荣山[2] 刘学毅[2] 

机构地区：[1]贵州理工学院,贵阳550003 [2]西南交通大学高速铁路线路工程教育部重点实验室,成都610031

出　　处：《铁道工程学报》2015年第1期32-37,共6页Journal of Railway Engineering Society

基　　金：贵州省科技厅联合基金项目(高速列车荷载作用下无砟轨道含水裂纹受力特性及影响研究)

摘　　要：研究目的：为分析无砟轨道结构裂纹内水压力变化特性，建立列车荷载一水耦合作用下裂纹水压力的计算模型。为验证模型的正确性，浇筑带裂纹的模型试件，采用万能伺服液压机施加循环动荷载，采用高灵敏度传感器测量裂纹内水压力，分析带水平裂纹的混凝土结构在循环荷载作用下，裂纹内水压力随加载幅值变化特性。以列车速度为250km／h为计算实例，分析裂纹内控制点水压力随列车荷载幅值变化。研究结论：结果表明：（1）试验中随着循环幅值（45±20～70±45kN）的增加，裂纹内测点水压力增大；（2）建立与试验条件一致的理论计算模型，试验数据与理论计算结果之间有误差存在，但是试验曲线与理论结果的变化趋势一致，计算模型是有效的；（3）采用列车荷载一水耦合作用下裂纹水压力的计算模型，计算当列车速度为250km／h，裂纹开口量、宽度、深度分别为3mm、1m、1m时，随着列车荷载的增加，裂纹内控制点水压力呈线性关系增大；（4）该研究结果可为分析无砟轨道结构伤损理论提供参考。Research purposes： Cracks - water pressure calculation model under the dynamical load and water action was established to understand the distribution of internal water pressure in cracks. In order to verify the validity of the model, pouring a model specimen with cracks, using universal servo -hydraulic machine production cycle dynamic load, high sensitivity sensor is used to measure water pressure inside the cracks. It analyzed the cracks water pressure amplitude variation with load characteristics. Cracks -water pressure calculation model was used to calculate the water pressure, when the train speed is 250 km/h as example.Research conclusions： The results show that ： （ 1 ） With increasing cyclic loading （45 ±20 - 70 ± 45 kN） , the water pressure of the measuring points inside the crack is also increasing. （2）Established the theoretical model and its condition is consistent with the experimental conditions, and it proves that the theoretical model is correct by experimental data and theoretical calculation results comparative analysis. （3）Using cracks -water pressure calculation model, cracks water pressure is calculated when the train speed is 250 kin/h, the crack opening size, width, depth profiling were 3 mm, 1 m,1 m. the water pressure of control point in the cracks increases with the increasing of train loads is a linear relationship. （4） The research results provide a theoretical references for analysis of non- ballasted track construction injury.

关 键 词：带水平裂纹混凝土试件 水压力 耦合作用 循环荷载 压力传感器 加载幅值 

分 类 号：U213.2[交通运输工程—道路与铁道工程]