层间连接对CRTS I型板式无砟轨道-路基系统力学特性的影响研究
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摘要
为研究层间连接对CRTS I型板式无砟轨道-路基系统力学特性的影响,在ANSYS环境下建立了层间松散、紧密及接触单元连接下无砟轨道-路基三维有限元空间力学模型,研究了不同荷载作用下,层间连接对CRTS I型板式无砟轨道力学特性的影响。计算结果表明:对于列车荷载,层间松散连接力学模型下轨道板及底座板应力比接触单元连接力学模型大4.1%～54.5%;层间紧密连接力学模型下,轨道板及底座板应力比接触单元连接力学模型小12.5%～32.3%;对于路基不均匀沉降荷载,层间紧密连接力学模型下轨道板和底座板纵向应力分别比层间接触单元连接力学模型大74.3%～88.8%、123.3%～126.4%;对于温度梯度荷载,层间紧密及松散连接力学模型下轨道板纵向和横向应力分别比层间接触单元连接力学模型大15.4%～19.7%、107.3%～121.2%。
In order to study the influence of interlayer connections on mechanical properties of CRTS I slab track-subgrade system,three dimensional slab track-subgrade finite element mechanical models with interlayer loose,tight and contact connection were established in ANSYS environment,and then the mechanical properties of interlayer connections on CRTS I slab track under different loads were studied.The calculated results show that:for the load of train,the stress of track slab and base plate calculated by the mechanical model with interlayer loose connection is 4.1% to 54.5% lager than that calculated by the mechanical model with interlayer contact connection,the stress of track slab and base plate calculated by the mechanical model with interlayer tight connection is 12.5% to 32.3% smaller than that calculated by the mechanical model with interlayer contact connection;for the load of uneven settlement of subgrade,the longitudinal stress of track slab and base plate calculated by the mechanical model with interlayer tight connection is respectively 74.3% to 88.8%,123.3% to126.4% larger than that calculated by the mechanical model with interlayer contact connection;for the load of temperature gradient,the longitudinal stress and transverse stress of track slab calculated by the mechanical models with interlayer tight and loose connection is respectively 15.4% to 19.7%,107.3% to 121.2% lager than that calculated by the mechanical model with interlayer contact connection.
In order to study the influence of interlayer connections on mechanical properties of CRTS I slab track-subgrade system,three dimensional slab track-subgrade finite element mechanical models with interlayer loose,tight and contact connection were established in ANSYS environment,and then the mechanical properties of interlayer connections on CRTS I slab track under different loads were studied.The calculated results show that:for the load of train,the stress of track slab and base plate calculated by the mechanical model with interlayer loose connection is 4.1% to 54.5% lager than that calculated by the mechanical model with interlayer contact connection,the stress of track slab and base plate calculated by the mechanical model with interlayer tight connection is 12.5% to 32.3% smaller than that calculated by the mechanical model with interlayer contact connection;for the load of uneven settlement of subgrade,the longitudinal stress of track slab and base plate calculated by the mechanical model with interlayer tight connection is respectively 74.3% to 88.8%,123.3% to126.4% larger than that calculated by the mechanical model with interlayer contact connection;for the load of temperature gradient,the longitudinal stress and transverse stress of track slab calculated by the mechanical models with interlayer tight and loose connection is respectively 15.4% to 19.7%,107.3% to 121.2% lager than that calculated by the mechanical model with interlayer contact connection.
引文
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[5]杨俊斌,刘学毅,梁东,等.CRTSⅠ型轨道板中部砂浆离缝对轨道竖向变形与受力研究[J].铁道标准设计,2013(6):22-24.
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[2]Esveld C.Recent Developments in Slab Track[J].European Railway Review,2013,9(2):81-85.
[3]苏乾坤,杨荣山.CRTSⅠ型板式无砟轨道凸形挡台树脂离缝成因分析[J].铁道标准设计,2016,60(1):43-48.
[4]张鹏飞,桂昊,高亮,等.简支梁桥上Ⅰ型板式无砟轨道制动力与位移分析[J].铁道科学与工程学报,2017,14(11):2323-2332.
[5]杨俊斌,刘学毅,梁东,等.CRTSⅠ型轨道板中部砂浆离缝对轨道竖向变形与受力研究[J].铁道标准设计,2013(6):22-24.
[6]徐庆元,李斌,周智辉.CRTS-Ⅰ型板式无砟轨道线路路基不均匀沉降限值研究[J].中国铁道科学,2012,33(2):1-6.