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习近平关注 高铁时速可否恢复350公里再受瞩目

2016-06-07 07:55:45   大河报

在根据大河客户端的网友调查中,有77%的网友认为,在安全的前提下,支持高铁提速。大河报的这一系列策划报道,引得清华大学新闻传播学院陈昌凤教授也来点赞,她说,大河报在两会开始阶段就能抛出这个议题,有大报风范。在全国两会重大报道中,能够展示独家策划意识和角度,将国家普适性话题、区域经济交通发展和民生关怀找了个最合适的话题切入点,体现了地方都市报的担当和新闻驾驭能力。

大河报2016年3月4日相关报道

院士之答

高铁提速,在技术上完全没有问题

在今年全国“两会”上接受本报采访后,昨日,中国工程院院士王梦恕,再次就高铁提速的话题,发表了自己的看法。

高铁提速,技术上有没有问题?“完全没有问题。”王梦恕斩钉截铁地说,时速跑385公里都没有问题。但是,安全度跟可靠度会降低,可能会出现毛病。运营成本也高,经济性上也会有所降低。

有一种论调认为,“高铁速度越快,越不安全”,对此,王梦恕认为,按照中国现有的轨道技术,即使按照385公里时速运行,也完全能够保证安全。只是出于延长机车和轨道寿命等更多考虑,才要寻找最为“经济”的实际运行速度。

那么,该不该提速?王梦恕打了个形象的比方,人吃饭,八成饱好,还是十成饱好?答案不言自明。“要留有一定的富余量,300公里时速是合理的速度,安全可靠。”他说,这样做的目的是要使高铁运行达到最佳状态。王梦恕认为,要实现一个“最佳和经济的速度”,这样既能尽量减小设备和线路损耗,又能最大程度发挥高铁运行带来的综合效益。

王梦恕认为,中国高铁提速要考虑几个问题,首先是机车寿命会减少,目前的300公里时速,能够降低磨损,提升机车寿命。其次是提速后,空气阻力系数增大,200公里时速空气阻力系数是30%,而目前是80%左右,提升至350公里时速的话,将高达90%,大大增加能耗。

最后,对于钢轨线路的质量和维护要求更高。提速后水平推力增大,会造成钢轨不稳定,增加风险,大量增加维护维修的成本。

“提速问题,应统筹安全、可靠、经济等方面,进行考虑。”王梦恕说。当前,国外高铁最高时速均是300公里,没有超出者,而中国当前实际运行高铁时速最高跑出310公里。

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相关阅读

专家:中国高铁暂不会再提速至350公里/小时

2016-03-05 13:53:55

政协委员:建议高铁时速恢复至350公里

2016-03-03 13:05:07
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