CONTROLLING FACTORS AND MECHANISMS OF INCOMPLETE OBSTRUCTION SEISMIC LANDSLIDE MOBILITY |
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| Authors: | FAN Xiao-yi LI Tian-hua TIAN Shu-jun ZHANG You-yi SUN Xin-po |
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| Affiliation: | School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China |
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| Abstract: | The topography, occurrence mechanism and lithology are the important factors of landslide movement. The lithology, seismic intensity, geological structure and topography in the travel path of 215 incomplete obstruction landslides with volumes more than 104m3 induced by Wenchuan earthquake were studied. Based on the classification of the factors established, we studied the factors influencing the movement distance of incomplete obstruction landslides. The following results are drawn. In the influence factors of topography in the travel path, the distance is largest in the straight valley topography, followed by the concave, ladder, turning valley, slope toe-type and slope-type landslides, in turn. The topography not only has remarkable influence on the distance of large-scale landslides, but also on the medium and small-scale landslides as well, which is the most important factor influencing the distance. The formation mechanism controlled by lithology, seismic intensity and geological structure has little influence on the mobility of medium-and small-scale landslides. For the large-scale landslides with volume more than 106m3, the distance of landslide with medium hard rock is larger than landslides with hard and soft rock. In the seismic intensity Ⅸ to Ⅺ areas, the landslide distance decreases with intensity increasing, contrary to the distribution of landslide-point density and landslide-area density. The geological structure has influence on the slide aspect of landslides and occurrence mechanism, but the influence is not remarkable to the landslide movement distance. |
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| Keywords: | incomplete obstruction seismic landslide movement distance influence factor mechanism |
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