摘要
Abstract
In response to the frequent occurrence of slope melting and landslide disasters during spring on highways in northern Heilongjiang Province,the slope collapse sites of Suibei Expressway and Beifu Expressway is taken an as example to investigate the hydrogeological conditions and analyze the factors affecting slope stability,and take soil samples from the slope collapse site.CT scanning technology is used to characterize the number of micro pores before and after soil freezing and thawing to summarize the characteristics of spring melting andlandslide.The re-search results are as follows that the soil at the landslide site is mainly silty clay.The causes include the generation and development of tension cracks,failure of interception ditch protection,damage to slope protection,slope soil subsidence(frequent rainfallcauses),and other factors;As the number of freeze-thaw cycles increases,the number of large pores in the soil first increases and then tends to be stable.The soil density decreases,and the structure tends to become loose.The mechanism of spring melting and landslide is that large pores gradually developunder the action of freeze-thaw cycles,ultimately a network of cracks on the slope surface and tension cracks at the top of the slope are formed.During the spring,rainfall and the snow melting covering the soil meltcause water to enter the shallow soil along cracks and fissures.A large amount of water accumulates,causing a sharp decrease in shear strength,and ultimately leading to the collapse of the slope soil along the weak sliding surface.关键词
边坡春融滑塌/滑塌诱因/伪彩色增强技术/CT扫描/滑塌机理Key words
slope melting and landslide in spring/cause of collapse/pseudo-color enhancement technology/CT scan/collapse mechanism分类
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