Research on Evolution Mechanism of Longitudinal Creep in Ballasted Continuous Welded Rail Turnouts for Railways in Extreme Environments
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摘要:
为揭示极端环境下有砟无缝道岔纵向爬行演变机理，本文基于位移时序数据与阻力演化情况，通过阻力曲线的偏移程度分析、加/卸载路径分解以及最短等效路径搜索，构建能考虑线路阻力退化效应的在役有砟无缝道岔纵向爬行精细化分析模型；首次探明了极端日轨温循环作用下道岔各钢轨及轨枕的非线性纵向力学行为，并评估扣件与道床阻力演化参数更新对残余应力、累积爬行量预测结果的影响. 结果表明：方向相反、幅值非对称的循环荷载将加剧纵向爬行；经历15次由−50 ℃至10 ℃变化的极端日轨温循环，钢轨最大残余变形达到4.98 mm；循环过程中以扣件与道床阻力均退化20%更新参数，会导致钢轨最大残余变形增至5.48 mm，心轨最大残余应力增长20.24%.
Abstract:To elucidate the evolution mechanism of longitudinal creep in ballasted continuous welded rail turnouts in extreme environments, based on time-series displacement data and resistance evolution characteristics, a refined analysis model for longitudinal creep of in-service ballasted continuous welded rail turnouts was established, with consideration of track resistance degradation effects. This model was developed through the analysis of resistance curve offsets, the decomposition of loading/unloading paths, and the search for the shortest equivalent path. The nonlinear longitudinal mechanical behavior of turnout rails and sleepers under extreme diurnal temperature cycles was elucidated for the first time, and the influence of updated fastening and ballast resistance parameters on residual stress and prediction results of cumulative creep displacement was assessed. The results indicate that cyclic loads with opposing directions and asymmetric amplitudes exacerbate longitudinal creep, with 15 extreme diurnal rail temperature cycles ranging from −50 ℃ to 10 ℃ resulting in a maximum residual rail deformation of 4.98 mm. Moreover, updating the parameters with a 20% degradation in both fastener and ballast resistance during the cycles causes the maximum residual rail deformation to increase to 5.48 mm, while the maximum residual stress of the nose rail grows by 20.24%.
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图 1 有砟无缝道岔模型及参数
Figure 1. Ballasted continuous welded rail turnout model and parameters
图 4 温度载荷历程与阻力参数更新示意
Figure 4. Temperature loading history and resistance parameter updating
图 6 道岔钢轨纵向力与轨枕纵向阻力示意
Figure 6. Longitudinal force of turnout rails and longitudinal resistance of sleepers
图 7 温度循环与阻力退化更新条件下的残余变形与应力
Figure 7. Residual deformation and stress under conditions of temperature cycle and resistance degradation updating
表 1 扣件弹簧等效载荷过程
Table 1. Equivalent load process of fastening springs
序号 等效载荷历程 $ 1 $ $ u_{\rm{t}1}=d_{1,M} $，$ u_{\rm{b}1}=0 $ $ 2 $ $ u_{\rm{t}2}=l_M-10^{-5}\mathrm{sgn}\; l_M $，$ u_{\rm{b}2}=0 $ $ 3 $ $ u_{\rm{t}3}=l\mathit{_M}+d_{\rm{b},\mathit{M}} $，$ u_{\rm{b}3}=d_{\rm{b},\mathit{M_{ }}} $ $ 4 $ $ u_{\rm{t}4}=d_{2,M} $，$ u_{\rm{b}4}=d_{\rm{b},\mathit{M}} $ $ 5 $ $ u_{\rm{t}5}=d_{\rm{t},\mathit{M}} $，$ u_{\rm{b}5}=d_{\rm{b},\mathit{M}} $ $ 6 $ 删除$ u_{\rm{t}5} $，删除$ u_{\rm{b}5} $ 
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表 2 道床弹簧等效载荷过程
Table 2. Equivalent load process of ballast springs
序号 等效载荷历程 $ 1 $ $ u_{\rm{t}1}=0 $，$ u_{\rm{b}1}=-d_{1,M} $ $ 2 $ $ u_{\rm{t}1}=0 $，$ u_{\rm{b}2}=-(l_M-10^{-5}\mathrm{sgn}\; l_M) $ $ 3 $ $ u_{\rm{t}3}=d_{\rm{t},\mathit{M}} $，$ u_{\rm{b}3}=-l\mathit{_M}+d_{\rm{t},\mathit{\mathit{M}}} $ $ 4 $ $ u_{\rm{t}4}=d_{\rm{t},\mathit{\mathit{M}}} $，$ u_{\rm{b}4}=d_{\rm{t},\mathit{M}}-d_{2,\mathit{M}} $ $ 5 $ $ u_{\rm{t}5}=d_{\rm{t},\mathit{M}} $，$ u_{\rm{b}5}=0 $ $ 6 $ 删除$ u_{\rm{t}5} $，删除$ u_{\rm{b}5} $
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