|
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.
|
|
Received: 09 July 2013
|
|
|
|
2014, Vol. 33 
