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| Research on Formation Mechanism of Sanjiadi Loess Seismic Landslide in Longnan City |
| LUO Dong － hai1，WU Wei － jiang2，Wang Nian － qin3，MU Peng4 |
| 1． ARSC Geological Exploration Institute，China National Administration of Coal Geology，Xi’an，Shanxi 710054，China; 2． Geological Hazards Prevention Institute，Gansu Academy of Sciences，Lanzhou，Gansu 730000，China;3． Xi’an University of Science and Technology，Xi’an，Shanxi 710054，China; 4． Engineering College of Armed Police Force，Xi＇an，Shanxi 710086，China |
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Abstract Research purposes: The 5?12 Wenchuan earthquake caused a big loss to the people＇s lives and property．There will be secondary geological disasters period within 10 years after the earthquake． Among the disasters，the landslide is one of the most extensive and harmful disasters． The correct understanding of the landslide formation mechanism caused by earthquake is the base and basis for control of the disaster．
Research conclusions: It is concluded that for the Sanjiadi seismic landslide in Longnan city，the slowly inclined structure of the loess mudstone interbedding is the internal factors of producing the landslide，its location in the joint zone of two structure is the internal power of producing the landslide，the abnormal development of debris flow is the main external factor of producing the landslide，and the coupling of seismic wave propagation direction with slope body stress field direction，the coupling of the seismic wave with the loess micro － structure and the coupling of seismic wave with groundwater anomalies are the factors of inducing the seismic loess landside． The proposal is made for control of the landslide according to formation mechanism． It has a certain guiding significance to the understanding of the formation mechanism of earthquake，the effective reduction of the secondary disasters induced by earthquake and the promotion of the post － disaster reconstruction work．
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Received: 25 November 2011
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2012, Vol. 29 
