NDLI: Characteristics of the Sanmen Formation clays and their relationship with loess landslides in the Guanzhong area, Shaanxi, China

Content Provider	Springer Nature Link
Author	Li, B. Feng, Z. Wang, W. P.
Copyright Year	2015
Abstract	Large, deep-seated landslides are one of the most common geologic hazards in the Loess Plateau of northwestern China, especially in the Guanzhong area of Shaanxi Province. To understand why these landslides occur, we conducted a field investigation, remote sensing image interpretation, and physical and mechanical tests. Geologic surveys have shown that the landslide deposits are composed of thick loess, river terraces, and the Pliocene Sanmen Formation and that the rupture surface is located in the Sanmen Formation clay. Test results suggest that the Sanmen Formation material has a high clay content (particle diameters < 1.95 μm) and a substantial proportion of expansive clay minerals such as smectite or illite-smectite. In addition to high activity and high water content, the clay is also characteristically weak with poor cementation and high expandability. The peak and residual strength values exhibit large differences under natural and saturated states. It is inferred that the strength of the Sanmen Formation clay greatly decreases when infiltrated by underground water. The clay then becomes a weak layer which forms shear zones. These shear zones are what control the development and distribution of landslides along the edge of the Loess Plateau. This study is important for understanding the occurrence of large-scale loess landslides and assessing urban natural hazards in the western Guanzhong area of Shaanxi.
Starting Page	7831
Ending Page	7843
Page Count	13
File Format	PDF
ISSN	18667511
Journal	Arabian Journal of Geosciences
Volume Number	8
Issue Number	10
e-ISSN	18667538
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-02-14
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Loess Plateau Landslides Shaanxi Province Northwestern China Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science

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