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工程力学  2015 

寒旱区路基冻融风蚀复合侵蚀机理试验研究

DOI: 10.6052/j.issn.1000-4750.2014.09.0815

Keywords: 冻融风蚀,抗复合侵蚀能力,复合侵蚀机理,风洞试验,寒旱区路基

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Abstract:

寒旱区路基常年受到风沙侵蚀,同时由于强烈温差变化造成路基填料因积雪融水入渗而引起冻融循环侵蚀破坏。路基会因风蚀和冻融侵蚀的复合作用引起结构损伤下抗剪强度的持续衰减。以内蒙古那-苏省际大通道锡林郭勒盟桑根达来段的风沙土填方路段为例,考虑不设边坡防护的裸边坡为最不利情况,通过冻融风蚀风洞试验研究路基在冻融循环和风蚀循环前后填料土体抗剪强度的变化规律,将路基填料土体抗剪强度的变化作为其抗复合侵蚀能力的表征,分析冻融循环侵蚀和风蚀作用对填料土体侵蚀机理的不同,以及两种不同侵蚀作用受填料含水率的影响,揭示寒旱区路基冻融风蚀复合侵蚀机理。

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