高速列车气动效应对二次衬砌作用数值研究
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摘要
随着列车速度提升,诱发的隧道气动效应愈发剧烈,在隧道设计初期加入气动效应考虑显得尤为必要.通过FLUENT动网格法模拟列车通过隧道产生的流场压力波,并以动荷载形式作用在ANSYS隧道模型上,研究衬砌在流场和围岩耦合作用下的响应机制.运用雨流法对易损伤点的应力时程进行循环统计,结合混凝土S-N曲线和Miner线性累计损伤理论,分析预测衬砌的疲劳寿命.
With the increase of train speed,the aerodynamic effect induced by the tunnel becomes more and more severe. It is particularly necessary to consider the aerodynamic effect in the initial stage of tunnel design. By the FLUENT dynamic mesh method is used to simulate the pressure wave generated by the train passing through the tunnel and acted on the ANSYS tunnel model in the form of dynamic load to study the response mechanism of the lining under the coupled action of the flow field and surrounding rock. The rain flow method is used to perform cyclic statistics on the stress time history of easily damaged points. Combined with the S-N curve of concrete and Miner linear cumulative damage theory,the fatigue life of the lining is predicted.
With the increase of train speed,the aerodynamic effect induced by the tunnel becomes more and more severe. It is particularly necessary to consider the aerodynamic effect in the initial stage of tunnel design. By the FLUENT dynamic mesh method is used to simulate the pressure wave generated by the train passing through the tunnel and acted on the ANSYS tunnel model in the form of dynamic load to study the response mechanism of the lining under the coupled action of the flow field and surrounding rock. The rain flow method is used to perform cyclic statistics on the stress time history of easily damaged points. Combined with the S-N curve of concrete and Miner linear cumulative damage theory,the fatigue life of the lining is predicted.
引文
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[17]钱永久.既有钢筋混凝土桥梁的评估与诊断[D].成都:西南交通大学,1992.
[2]杨树新,李宏.高地应力环境下硐室开挖围岩应力释放规律[J].煤炭学报,2010,35(1):26-30.
[3]晏勤,李树忱.锚杆加固作用下圆形隧道复合岩体围岩特征曲线解析方法研究[J].岩石力学与工程学报,2017,36(12):3021-3027.
[4]郑建中,乔春生.偏压连拱隧道洞口段二次衬砌施工时机探讨[J].隧道建设,2006,26(6):12-16,27.
[5]TAKANOBU O,KOZO F.Numerical investigation of three-dimensional compressible flows induced by a train moving into a tunnel[J].Computers and Fluids,1997,26(6):565-585.
[6]周瑜.采用滑移网格的二维非定常NS方程数值计算[D].绵阳:中国空气动力研究与发展中心,2009.
[7]MEERIKINE A V,VROUWENVELDER A C W M.Surface ground vibration due to moving train in a tunnel:two-dimensional model[J].Journal of Sound,2000,234(1):43-66.
[8]黄娟.基于损伤理论的高速铁路隧道结构振动响应分析及疲劳寿命研究[D].长沙:中南大学,2010.
[9]汪宏.基于MATLAB的疲劳寿命预测研究[D].西安:长安大学,2009.
[10]张兆杰.高速列车隧道空气动力学三维数值仿真系统的开发与应用[D].成都:西南交通大学,2006.
[11]蔡佳骏,李之达.ANSYS二维弹塑性分析在联拱隧道围岩稳定性评价中的应用[J].水利与建筑工程学报,2005,3(1):10-14,19.
[12]吴富民,聂宏.关于雨流计数法的讨论及修正[J].航空学报,1986,7(3):241-247.
[13]RICHARDS F D,LAPOINTE N R,WETZEL R M.A cycle counting algorithm for fatigue damage analysis[J].Automotive Engineering Congress and Exposition,1974,2(1):23-24.
[14]HALFORD G R.The energy required for fatigue[J].J Materals,1996,1(1):3-18.
[15]SAUNDERS S C.A probabilistic interpretation of Miner's rule[J].Siam Journal on Applied Mathematics,1970,19(1):251-265.
[16]赵造东.水工混凝土受压疲劳性能及累积损伤研[D].昆明:昆明理工大学,2011.
[17]钱永久.既有钢筋混凝土桥梁的评估与诊断[D].成都:西南交通大学,1992.