陕西泾阳南塬蒋刘4~#滑坡运动堆积特征及流动性成因分析
发布时间：2019-03-28 18:55
【摘要】：自1976年引水灌溉以来,泾阳南塬黄土滑坡频发。2016年3月6日发生的蒋刘4~#滑坡呈近流体状高速远程运动,并呈长带状堆积于前缘平坦地面。其独特的运动堆积特征与该区其他类型滑坡差异显著,具有一定的特殊性。本文基于野外地质调查,通过无人机航测、现场含水率试验以及室内试验等手段,对蒋刘4~#滑坡进行分析研究。结果表明:(1)滑坡呈高速远程运动、长带状堆积,堆积体天然密度表现出从斜坡坡脚至前缘陡坎先增大,越过陡坎后明显减小的趋势;(2)滑源区黄土以粉粒为主、黏粒含量较少的粒组成分以及黄土中次生矿物含量较高是蒋刘4~#滑坡形成的物质基础;(3)大面积灌溉以及引水渠漏失严重造成大量水体下渗,该区S5古土壤层形成的相对不透水底板为上层滞水聚集创造了条件,使近底板上覆黄土处于饱水状态,导致斜坡稳定性降低;(4)地貌上剪出口位置较高,滑体潜在势能大,坡脚人工开挖的多级陡坎为滑坡高速远程运动创造了有利条件。蒋刘4~#滑坡规模较小但流动性显著,作为近年来蒋刘一带滑坡发展演化的主要类型,研究其运动堆积特征及流动性成因,为科学防治滑坡具有一定指导意义。
[Abstract]:Since the water diversion and irrigation in 1976, the loess landslides in the south and south of the Yangtze River have been frequent. The Liu4-# landslide, which occurred on March 6,2016, is in close fluid-like high-speed and long-distance motion, and has a long strip-shaped accumulation on the flat surface of the leading edge. The unique characteristics of the movement accumulation and other types of landslides in this area are significant and have some special characteristics. Based on the field geological survey, this paper makes an analysis and research on Liu 4 ~ # landslide by means of unmanned aerial vehicle aerial survey, on-site water content test and in-room test. The results show that: (1) the landslide is high-speed remote movement, long strip-shaped accumulation, and the natural density of the accumulation body shows that the slope of the slope toe to the leading edge is increased firstly, and the trend of the obvious reduction after crossing the steep canis; and (2) the loess of the sliding source region is dominated by the powder and the powder, The small grain composition and the higher content of secondary mineral in the loess are the material base of the formation of the Liuliu 4 ~ # landslide; (3) the large-area irrigation and the leakage of the diversion canal seriously cause a large amount of water to be drained, the relative water-impermeable bottom plate formed by the S5-old soil layer in the area creates a condition for the upper-layer stagnant water, so that the loess-covered loess on the near bottom plate is in a water-saturated state, so that the stability of the slope is reduced; (4) the position of the cut-off outlet in the landform is high, the potential potential energy of the sliding body is large, The multi-stage scarp of the artificial excavation of the slope toe creates favorable conditions for the high-speed remote movement of the landslide. The scale of Jiang Liu 4 ~ # landslide is small but the fluidity is remarkable. As the main type of the landslide development and evolution in recent years, it is of great significance to study the characteristics of its movement and the cause of its fluidity.
【作者单位】： 成都理工大学地质灾害防治与地质环境保护国家重点实验室;
【基金】：国家重点基础研究发展计划(973计划)(2014CB744703) 国家自然科学基金重点项目(41630640)资助
【分类号】：P642.22
[Abstract]:Since the water diversion and irrigation in 1976, the loess landslides in the south and south of the Yangtze River have been frequent. The Liu4-# landslide, which occurred on March 6,2016, is in close fluid-like high-speed and long-distance motion, and has a long strip-shaped accumulation on the flat surface of the leading edge. The unique characteristics of the movement accumulation and other types of landslides in this area are significant and have some special characteristics. Based on the field geological survey, this paper makes an analysis and research on Liu 4 ~ # landslide by means of unmanned aerial vehicle aerial survey, on-site water content test and in-room test. The results show that: (1) the landslide is high-speed remote movement, long strip-shaped accumulation, and the natural density of the accumulation body shows that the slope of the slope toe to the leading edge is increased firstly, and the trend of the obvious reduction after crossing the steep canis; and (2) the loess of the sliding source region is dominated by the powder and the powder, The small grain composition and the higher content of secondary mineral in the loess are the material base of the formation of the Liuliu 4 ~ # landslide; (3) the large-area irrigation and the leakage of the diversion canal seriously cause a large amount of water to be drained, the relative water-impermeable bottom plate formed by the S5-old soil layer in the area creates a condition for the upper-layer stagnant water, so that the loess-covered loess on the near bottom plate is in a water-saturated state, so that the stability of the slope is reduced; (4) the position of the cut-off outlet in the landform is high, the potential potential energy of the sliding body is large, The multi-stage scarp of the artificial excavation of the slope toe creates favorable conditions for the high-speed remote movement of the landslide. The scale of Jiang Liu 4 ~ # landslide is small but the fluidity is remarkable. As the main type of the landslide development and evolution in recent years, it is of great significance to study the characteristics of its movement and the cause of its fluidity.
【作者单位】： 成都理工大学地质灾害防治与地质环境保护国家重点实验室;
【基金】：国家重点基础研究发展计划(973计划)(2014CB744703) 国家自然科学基金重点项目(41630640)资助
【分类号】：P642.22
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