地下水诱发渐进后退式黄土滑坡成因机理研究——以甘肃黑方台灌溉型黄土滑坡为例

发布时间：2018-02-07 17:33

本文关键词： 黄土滑坡渐进后退式软基效应地下水局部雍高　出处：《工程地质学报》2017年01期 　论文类型：期刊论文

【摘要】：黑方台位于我国甘肃省永靖县,该区由于长期灌溉导致地下水位上升,诱发了大量的黄土滑坡,其中最典型的一类滑坡为渐进后退式黄土滑坡。通过对比代表性滑坡多期Google影像,并结合现场调查分析了近年来新发生的滑坡,发现该类黄土滑坡具有典型的渐进后退式演化过程。现场调查和对典型滑坡剖面黄土含水率的实测发现,黄土层底部受地下水的长期浸泡软化所形成的软基效应是使黄土滑坡不断发生的主要原因,而滑坡发生后留下的弧形凹槽往往成为地下水局部集中汇聚和排泄点,滑源区被滑坡残留体覆盖导致地下水位局部雍高上涨,将导致同一滑坡发生多次渐进后退式破坏。
[Abstract]:Heifangtai is located in Yongjing County, Gansu Province, where a large number of loess landslides have been induced due to the rise of groundwater level caused by long-term irrigation. The most typical type of landslide is the progressive backward loess landslide. By comparing the multi-stage Google images of representative landslides and combining with the field investigation, this paper analyzes the newly occurring landslides in recent years. It is found that this kind of loess landslide has a typical evolution process of gradual retrogression. The soft foundation effect caused by the soaking and softening of the bottom of the loess soil is the main reason for the continuous occurrence of the loess landslide, and the arc groove left behind after the landslide often becomes the local concentration and discharge point of the groundwater. The local uvula of groundwater level in the sliding source area is covered by the residual body of the landslide, which will lead to multiple progressive retrogressive damage of the same landslide.
【作者单位】：地质灾害防治与地质环境保护国家重点实验室(成都理工大学);
【基金】：国家自然科学基金重点项目(41630640) 国家重点基础研究发展计划(2014CB744703) 国家杰出青年科学基金(41225011)资助
【分类号】：P642.22

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