首页> 外文期刊>Acta geologica Sinica: Journal of the Geological Society of China >Deformation Characteristics of Loess Landslide along the Contact between Loess and Neogene Red Mudstone
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Deformation Characteristics of Loess Landslide along the Contact between Loess and Neogene Red Mudstone

机译:黄土与新近纪红泥岩接触的黄土滑坡变形特征

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摘要

The loess landslide along the contact between loess and Neogene red mudstone (NRM) is one of those that have occurred extensively and frequently in loess areas of China. To better understand the mechanism of this type of landslides, a distressed loess slope being subjected to deformation along the loess-NRM contact was comprehensively investigated through approaches of field monitoring and laboratory physical modeling. Field observation and physical modeling shows that the slope deformation will experience two distinct processes: 1) laterally retrogressive and vertically progressive propagation, which was initiated by falling of the slope head; and 2) retrogressively separate mass sliding along the weak basal zone of the loess-NRM contact with minor sliding along the paleosols within the loess. Shear failure of the loess-NRM contact may initiate in the middle section, followed by a progressive propagation towards the slope toe and inner slope. Analysis reveals that the deformation characteristics of the distressed slope are largely constrained by slope topography, the unique structure, physical and mechanical properties of loess and paleosols, and occurrence and nature of the loess-NRM contact. Rainfall has significantly influence on the deformation characteristics of the slope through its interaction with the loess and soil of the loess-NRM contact. Additionally, improper style and intensity of cutting on the slope greatly enhance and accelerate the deformation course of the slope.
机译:黄土与新近纪红泥岩(NRM)接触的黄土滑坡是中国黄土地区广泛而频繁发生的滑坡之一。为了更好地了解这类滑坡的机理,通过现场监测和实验室物理模拟的方法,对沿黄土-NRM接触变形的黄土边坡进行了全面研究。现场观察和物理模拟表明,边坡变形将经历两个不同的过程:1)侧向倒退和垂直渐进传播,这是由边坡头的下降引起的; 2)沿黄土-NRM接触的弱基区滑移的渐进分离质体与沿黄土内古土壤的轻微滑移。黄土-NRM接触的剪切破坏可能在中段开始,然后逐渐向坡脚趾和内坡传播。分析表明,边坡地形,黄土和古土壤的独特结构,物理机械性能以及黄土-NRM接触的发生和性质,极大地限制了遇险边坡的变形特性。降雨通过与黄土-NRM接触的黄土和土壤的相互作用而对边坡的变形特性产生重大影响。另外,不适当的样式和坡度上的切割强度极大地增强和加速了斜坡的变形过程。

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