摘要
针对黑龙江省北部地区高速公路频发的边坡春融滑塌灾害现象,以绥北高速公路和北富高速公路的边坡滑塌现场为例,调查边坡滑塌处的水文地质条件,分析影响边坡稳定性的因素,并在边坡滑塌处取土制样,使用CT扫描技术表征土体冻融前后的细观孔隙数量,总结春融滑塌演变特征。调研结果如下:边坡滑塌现场土质主要为粉质黏土,边坡滑塌产生的诱因包括张拉裂缝的产生及发育、截水沟防护失效、坡面防护破坏、坡面土体沉陷(降雨频发导致)等;随着冻融循环次数增加,土体中大孔隙数量先增多后趋于稳定,土体密度降低,结构趋于松散。春融滑塌机理为:冻融循环作用下大孔隙逐渐发育,最终形成坡面的网状裂缝和坡顶的张拉裂缝。春融期间的降雨及土体上方覆盖的积雪融化,使得水分沿着裂缝及裂隙进入浅层土体中,大量水分积聚导致边坡土体抗剪强度急剧下降,最终导致边坡土体沿软弱滑动面滑塌。
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 research 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.
作者
鲁军
LU Jun(China Railway Construction Investment Group Co.,Ltd.,Harbin 150078,China)
出处
《市政技术》
2025年第6期67-73,共7页
Journal of Municipal Technology
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
slope melting and landslide in spring
cause of collapse
pseudo-color enhancement technology
CT scan
collapse mechanism
作者简介
鲁军,男,高级工程师,学士,主要研究方向为道路工程,E-mail:421315215@qq.com。
