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| MECHANISMS OF CATASTROPHIC LANDSLIDE ON JANUARY 11，2013，IN ZHENXIONG COUNTY：FLUIDIZATION INITIATION AND MOVEMENT LIQUEFACTION OF HIGH POROSITY SOIL |
| YAO Xin1，YU Kai1，2，ZHANG Yongshuang1，LI Lingjing1，2 ，ZHOU Nengjuan1 |
(1. Key Laboratory of Neotectonic Movement and Geohzards，Ministry of Land and Mineral Resources，Institute of Geomechanics，Chinese Academy of Geological Sciences，Beijing 100086，China；2. College of Engineering Geotechnique，
China University of Geosciences，Beijing 100083，China) |
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Abstract On 11th of January，2013，a catastrophic landslide with an estimated volume of 250 000 m3 occurred in Zhenxiong County，Southwestern China. The geological surveying，the landslide mapping，the soil sampling and the laboratory tests were carried out afterwards to study the catastrophic causes and mechanisms of the landslide. It was found that there was an abundant precipitation even in the dry season of January due to the effects of the vertical climate and the micro geomorphology. The late Triassic colluvium of Feixianguan formation(T1f) in the stratum of the slope was found to have a high porosity and to be easily saturated which was very likely prone to landsliding. The initiation of the fluidization of the saturated soil of high porosity and the liquefaction due to the movement were found to be the mechanisms of the sudden occurring and the long range movement of the landslide. The mining activity on the deeply buried coal seam over 300 m away from the landslide were excluded to be the cause of the landslide based on the facts that there were no mine disasters and no mine collapses when landslide occurred.
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Received: 09 July 2013
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2014, Vol. 33 
