Distribution and characteristics of landslide in Loess Plateau: A case study in Shaanxi province
Distribution and characteristics of landslide in Loess Plateau: A case study in Shaanxi province
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DOI：
10.1016/j.enggeo.2017.03.001
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发表时间：
2018-03-26
影响因子：
7.4
通讯作者：
Li, Wei
中科院分区：
文献类型：
--
作者：
Zhuang, Jianqi;Peng, Jianbing;Li, Wei
中国每年约有三分之一的地质灾害发生在黄土高原，造成人员伤亡，破坏天然气和石油管道，破坏公路，铁路和耕地退化。通过野外调查与监测、现场试验和室内试验，对黄土滑坡的分布、特征和成因等影响因素进行了深入的研究。首先，我们发现79%的滑坡浅于10米，85%的滑坡体积小于10万米（3）。其次，黄土高原滑坡主要发生在坡度为20-35度的东南向凹坡剖面上。第三，黄土滑坡的等效摩擦系数很低，滑面倾角小，滑距长。黄土滑坡一般转化为泥石流，导致过境量增加，形成地质灾害链。前期降雨是诱发黄土滑坡的重要因素。最后，黄土高原的滑坡群的发生是因为黄土由于其松散和高度多孔的结构在高压下容易崩解。随着变形量和含水量的增加，粘聚力急剧下降，滑坡在滑动过程中容易发生静力液化。(C)2017爱思唯尔B. V.保留所有权利。
Every year about one third of the geohazards in China occur in the Loess Plateau causing human loss, damaging gas and oil pipelines, destroying highways, railways and degrading farmland. Field investigation and monitoring, in-situ tests and laboratory experiments were performed to improve our understanding of the factors effecting the distribution, characteristics and causes of loess landslides. First, we find that 79% of the landslides are shallower than 10m, 85% have a volume of less than 100,000 m(3). Second, landslides on the Loess Plateau occur primarily on concave slope profiles that have slope angles of 20-35 degrees and that face south-east. Third, the equivalent coefficient of friction of loess landslides is very low resulting in long run-out with a low angle sliding surface. Loess landslides generally transform into mud-flows resulting in an increase in volume in transit and forming a geohazard chain. Antecedent rainfall plays an important role in triggering loess landslides. Finally, clusters of landslides in the Loess Plateau occur because the loess easily disintegrates under high pressure due to its loose and highly porous structure. There is a sharp decrease in cohesive strength with increase in deformation and water content and thus landslides tend to undergo static liquefaction during sliding. (C) 2017 Elsevier B.V. All rights reserved.