The effect of enhanced curving forces on the behaviour of canted ballasted track
The effect of enhanced curving forces on the behaviour of canted ballasted track
复制标题
增强弯曲力对倾斜有碴轨道性能的影响
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
M. Burstow
中科院分区：
文献类型：
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作者：
J. Priest;W. Powrie;L. Le Pen;P. Mak;M. Burstow
铁路道碴的性能不仅取决于道碴本身的特性，还取决于列车在其所支撑的轨道上运行时施加的轴重的大小、频率和数量。最近越来越频繁和更快的列车趋势突显了有碴铁路轨道的一些潜在局限性。特别是，在英国西海岸主线上引入倾斜式列车，允许列车在大部分路线上提高运行速度，与零星发生道碴迁移的局部区域相吻合。这种现象涉及道碴颗粒从轨道倾斜部分的高侧移动到低侧，暴露出曲线高(外部)侧的轨枕末端，从而降低轨道的横向阻力，从而增加维护要求。本文报告了一项调查的结果，该调查试图确定造成这种行为的潜在机制。在经历了道碴迁移的两个地点，对列车通过下的枕端位移进行了测量。对测量数据的分析以及对施加在轨道结构上的力的数值模拟表明，摆式列车的速度和典型轴重的增加导致了更大的侧向力和轨枕(在垂直平面上)的更大旋转，而不是以前在线路上使用的由机车加拖车组成的列车。假设这反过来会导致道碴缓慢但渐进地沿着倾斜的轨道的坡度移动。然而，鉴于道碴迁移点的高度局部化性质，其他因素，如不规则的底基层刚度和道碴深度，也可能导致这种现象，需要进一步的工作来确定可能引发这种影响的各种情况的组合。
The performance of railway ballast depends not only on the characteristics of the ballast itself but also the magnitude, frequency and number of axle loads imposed by the trains running on the track it supports. Recent trends towards more frequent and faster trains have highlighted some potential limitations of ballasted railway track. In particular, the introduction of tilting trains on the UK West Coast Main Line, which allowed train operating speeds to be increased over much of the route, has coincided with the sporadic occurrence of localized areas of ballast migration. This phenomenon involves ballast particles moving from the high side of a canted section of track to the low side, exposing the sleeper ends on the high (outer) side of the curve, reducing the lateral resistance of the track and therefore increasing maintenance requirements. This paper reports the results of an investigation carried out to try to identify the underlying mechanism responsible for this behaviour. Measurements of sleeper end displacements under the passage of trains were made at two locations which had experienced ballast migration. Analysis of the measured data together with numerical modelling of the forces imposed on the track structure suggest that the increased speed and typical axle loads of the tilting trains result in larger lateral forces and larger rotation of the sleeper (in the vertical plane) than for a train consisting of a locomotive plus trailing vehicle, as was previously used on the route. It is hypothesized that this leads in turn to a slow but progressive movement of the ballast down the slope of the canted track. However, given the highly localized nature of the ballast migration sites, other factors such as an irregular sub-base stiffness and ballast depth may also contribute to the phenomenon and further work is required to determine the combinations of circumstances that may trigger this effect.
DOI：
10.1243/0954409jrrt51
发表时间：
2007-03-01
影响因子：
2
作者：
Bowness, D.;Lock, A. C.;Richards, D. J.
通讯作者：
Richards, D. J.
DOI：
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发表时间：
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期刊：
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影响因子：
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作者：
J A Priest (Author)
通讯作者：
J A Priest (Author)