广西全州县广坑漕山体滑坡成因分析

Analysis on the Causes of Landslide in Guangkengcao,Quanzhou,Guangxi

通过对广西全州县广坑漕滑坡现场勘查,结合气象观测资料综合分析,表明广坑漕山体滑坡的主要原因是:①地质环境受人为工程破坏,山体两侧有新旧采石场存在;②滑坡点是迎风坡地形,有利强降水发生;③滑坡前当地长时间降水少,干旱导致土质疏松,后期天气转折,出现持续降水,土壤经浸泡迅速软化;④南亚季风急流突发性增大,在桂北喇叭口地形迎风坡产生剧烈上升运动,并与高空槽过境相遇造成对流性暴雨,水压力及山体自重量同时增大,导致坡体突然失稳,引发滑坡。

The field investigation of landslide in Guangkengcao,Quanzhou and analysis on the meteorological observation data show that the main causes of the landslide in Guangkengcao,Quanzhou are the followings： 1） Geological structure has been destroyed by human activities as new and old quarries on both sides of the mountain;2） The landslide site is on windward slopes where is prone to severe precipitation;3） The long drought before the landslide had caused soil become loose,and then continuous rains softened the soil rapidly;4） Jet in the South Asian Monsoon enhanced suddenly,leading to a sharp uplift when it arrived the windward slope of bell terrain in northern Guangxi,and resulted in torrential rain coupling with the upper-level though.Excessive weight of water and soil triggered the landslide.