Advances in Earth Science ›› 2015, Vol. 30 ›› Issue (1): 26-36. doi: 10.11867/j.issn.1001-8166.2015.01.0026

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A Review of the Study of Loess Slump

Yaming Tang 1, 2( ), Wei Feng 1, 2, Zhengguo Li 1, 2   

  1. 1. Xi’an Center of China Geology Survey, Xi’an 710054, China
    2. Key Laboratory for Geo-hazards in Loess Area, China Ministry of Land and Resources, Xi’an 710054, China
  • Received:2014-09-24 Revised:2014-12-06 Online:2015-03-05 Published:2015-01-20

Yaming Tang, Wei Feng, Zhengguo Li. A Review of the Study of Loess Slump[J]. Advances in Earth Science, 2015, 30(1): 26-36.

There has widely developed a specific kind of landslide-loess slump in the north of loess plateau in China, which is different from loess slide or loess fall because of the high sandy ingredient in loess. Due to the weak cement of sandy loess, the slump shows some other features than “typical” loess landslide. In distribution scopes, it often occurres in sandy loess belt, beyond that there are clay loess belt and silty clay loess belt. Due to the extreme shortage of land resources, the local people often choose the concave banks of valley as the cave dwellings sites whereas the convex banks are kept to develop agriculture. Generally, the concave banks have already been eroded much by rivers which makes the level stress of the slope release. However, the excavation for constructions reduces the level stress furthermore. Therefore, it causes the shear stress increase at the feet of the slope. The equilibrium state of the slope is destroyed, and then the failure occurres. The triggering factors of loess slump include rainfall, freeze thawing, freeze swelling, excavation, etc. In fact, these factors often comprehensively affect the slumps. In terms of their deformation and failure mechanism, scientists put forward different views, which include falling firstly and sliding secondly, sliding firstly and fall secondly, from middle parts rupture extending to top and bottom, and integrated sliding and falling. The nearest research implies that the failure mechanism be the bottom shearing failure and then the top tension failure. Referring to the failure mechanism at a micro level, few researches have been done to this kind of landslide. Future studies should investigate the triggering factors widely and deeply, summarize the characteristics of the deformation and failure, apply the numerical and physical simulation methods comprehensively, build up the geological-mechanic model, analyze and clarify the deformation and failure mechanisms quantitatively on the basis of strain and stress relationship, and study the failure mechanisms on a micro level.

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