高速铁路隧道缓冲结构气动载荷与结构应力特性分析

王英学; 高波; 任文强

doi:10.6052/0459-1879-16-343

高速铁路隧道缓冲结构气动载荷与结构应力特性分析

doi: 10.6052/0459-1879-16-343

西南交通大学交通隧道工程教育部重点实验室, 成都 610031

基金项目:

国家“863”计划资助项目 2011AA11A103-3-3-2

详细信息

通讯作者:
王英学,教授,主要研究方向:隧道及地下工程.E-mail:wangyingxue@swjtu.edu.cn

中图分类号: U451.3
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- 被引次数: 0
出版历程
- 收稿日期: 2016-11-25
- 修回日期: 2016-11-28
- 网络出版日期: 2016-12-02
- 刊出日期: 2017-01-18

AERODYNAMIC LOAD AND STRUCTURE STRESS ANALYSIS ON HOOD OF HIGH-SPEED RAILWAY TUNNEL

Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要: 高速列车通过隧道时，会引起车隧气动效应.在隧道洞口设置缓冲结构是简便有效的应对措施之一.而缓冲结构一般设置在隧道洞口，列车通过隧道产生气动载荷对该结构的影响也不容忽视.本文采用数值方法，利用Ansys软件的workbench模拟平台，对列车通过隧道产生的气动载荷作用在顶部单开口缓冲结构上的压应力变化进行模拟.研究结果表明：气动载荷所引起的结构附加应力作用明显.当行车速度为350 km/h时，附加应力可以达到80 kPa，而缓冲结构开口周围成为气动载荷附加应力集中区.对于双线隧道，近车壁面与远车壁面的附加压应力规律一致，但近车侧应力值要大于远车侧.与压力波在隧道内的传播特性类似，气动载荷所引起的附加压应力具有往复传播特征.另外，对顶部缓冲结构开口附近出现附加应力集中的原因进行了分析，确定缓冲结构形式是引起应力集中的决定因素.以上结论对隧道洞口缓冲结构的设计及安全巡查具有一定的指导意义.
- 高速列车 /
- 隧道 /
- 缓冲结构 /
- 气动载荷 /
- 流固耦合
Abstract: When high speed train passes through tunnel, aerodynamic effect will be induced.Setting hood at tunnel entrance is one of the convenient and effective measures for controlling aerodynamic effect.While the hood usually lay at tunnel entrance, in a long run, the aerodynamic load on the structure also should not be overlooked.In this paper, using Ansys-workbench simulation platform, the fluid structure coupling character induced by aerodynamic load on single top opening hood was analyzed.The research results showed that the extra-pressure stress induced by aerodynamic load was notable.To the train of running speed 350 km/h, the induced extra pressure stress on hood structure can reach 80 kPa.On the tunnel hood, the region around the openings appeared a relative high extra pressure stress.Since the tunnel is used for double railway line, the variation law of extra pressure stress on the tunnel hood inertial side wall of close to and far from train is almost same, while the stress pressure on inertial side wall of close to train is a little larger than that on the other side.Like the compression wave transportation in tunnel, the extra pressure stress induced by aerodynamic load also shows reciprocating transmission characteristics.The reason of stress concentration around the hood openings was deduced and showed that hood structure condition is the intrinsic fact for resulting in the detrimental effect.These conclusions on aerodynamic load are advisable for tunnel hood design and safety checking.
- high-speed train /
- tunnel /
- hood /
- aerodynamic load /
- fluid structure coupling

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图 1 隧道断面图

1--隧道中线，2--线路中线，3--安全空间，4--救援通道，5--内轨顶面

Figure 1. Tunnel cross-section

1--tunnel central line,2--rail trak centerline,3--safety space,4--rescue channel,5--the top of inner rail

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图 2 列车模型网格图

Figure 2. Numeral model grid mesh of the train

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图 3 计算模型尺寸布置示意图(单位：m)

Figure 3. Numeral simulation model dimension (unit：m)

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图 4 流场分析中的隧道缓冲结构网格

Figure 4. Tunnel hood grid mesh of fluent model

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图 5 隧道缓冲结构开口尺寸(单位：m)

Figure 5. Tunnel hood opening dimension (unit：m)

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图 6 隧道缓冲结构计算网格

Figure 6. Tunnel hood grid mesh of structure model

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图 7 列车进入隧道引起的压力场和缓冲结构应力场云图 ($t=1.0$ s,单位：Pa)

Figure 7. Pressure and stress contour graphics induced by train entering tunnel hood ($t=1.0$ s,unit: Pa)

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图 8 缓冲结构拱顶中心线附加压应力变化时程曲线

Figure 8. Extra-pressure stress-time relative graphics on top zone of hood

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图 9 缓冲结构侧壁压应力变化时程曲线

Figure 9. History curves of extra-pressure stress on the side zone of hood

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图 10 缓冲结构壁面首个附加压应力峰值与距洞口距离相关曲线

Figure 10. The correlation curves between the first peak of extra-pressure stress and the distance to hood entrance

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表 1 缓冲结构力学参数

Table 1. Tunnel hood structure mechanics parameter

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