恩施州滑坡灾害发生机理的研究

以建始县长梁乡、巴东县信陵镇等几处较大滑坡为例,对恩施州滑坡灾害的形成原因、发生机理及其空间分布规律进行了初步研究。发现其滑坡灾害主要分布在江河沿岸、沟谷坡地、公路沿线等坡度较大和地质结构脆弱的地带;诱发因素主要有工程因素与降水等;形成机理主要包括坡体结构上松下密、滑动体透水性好而基面透水性差导致的基质抗剪强度下降,滑体前缘有足够的临空面,植被的严重破坏等,若再遇一定强度的降水便可诱发滑坡灾害的发生。

Preliminary Research on the Mechanism of Landslide Disaster in Enshi Autonomous Prefecture

The bigger landslides in Changliang Countryside of Jianshi County and Xingling Town of Badong County in Enshi autonomous prefecture were took as the example to preliminarily study the forming reason,mechanism and its space distribution rule.The results indicated the landslide disaster mainly happened in a steep slope such as the river and stream coast,ravine,vale and along the road and the frail region of geological structure.The main induced factors were the engineering factor and precipitation,etc.The mechanism mainly included that the slop body structure were the relax at upper level and compactness at lower level,the permeability of the sliding body were better but the base were poor,so that the shearing strength were down,there were enough hang in the air in front of the sliding body,and the vegetation were seriously destroyed.Under the certain intensity precipitation,the loadslide disaster would be occured possibly.