落石冲击旁山填方路基边坡破坏数值模拟

发布时间：2018-01-26 05:21

本文关键词： 落石路基边坡力学响应 LS-DYNA　出处：《地下空间与工程学报》2017年S1期 　论文类型：期刊论文

【摘要】：落石灾害造成山区中低等级公路路基滑塌灾害十分普遍,造成交通堵塞及大量的经济损失,甚至人员伤亡。以旁山沥青路面填方路基边坡为原型,采用显式动力学程序LSDYNA,研究了不同下落高度及入射角度的落石冲击作用下路基边坡的力学响应,揭示了落石冲击力和路基边坡的变形、能量转化与落石高度和入射角度的相关性。落石冲击力与入射角负相关,入射角为45°时路基变形最大。路肩位移、路基路面变形与下落高度正相关。路面结构对路基的保护作用与下落高度呈正相关。落石高度的变化主要影响路基路面变形,入射角的变化主要改变土体力学响应范围。研究成果可为路基边坡的落石灾害防护设计提供参考。
[Abstract]:The rockfall disaster is very common in the mountain area, causing traffic jam and a large number of economic losses, even casualties. Taking the embankment slope of the asphalt pavement as the prototype. The mechanical response of roadbed slope under the action of falling rock impact with different falling height and incidence angle is studied by using explicit dynamic program LSDYNA. the impact force and deformation of roadbed slope are revealed. The energy conversion is related to the height of falling stone and the angle of incidence. The impact force of falling stone is negatively related to the angle of incidence, and the deformation of roadbed is the largest when the angle of incidence is 45 掳, and the shoulder displacement. The deformation of subgrade and pavement is positively related to the falling height. The protective effect of pavement structure on subgrade is positively related to the falling height. The change of rock fall height mainly affects the deformation of roadbed and pavement. The change of incident angle mainly changes the range of mechanical response of soil, and the research results can provide reference for the design of rock fall disaster protection of subgrade slope.
【作者单位】：包钢勘察测绘研究院;重庆大学土木工程学院;
【基金】：国家自然科学基金(41472245)
【分类号】：U418.55
【正文快照】： 0引言落石主要是指单一岩块或岩石群从陡坡、高处坠落而发生的崩落现象。落石从陡坡分离后,可沿着坡面以自由落体、滚动、弹跳、滑动等运动方式快速向下冲击边坡及路基等,进而影响人民生命财产的安全。西南山区地形错综复杂,二级及以下等级公路里程占总里程百分比高达90%以上[

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