大型缓倾斜滑坡孕育特征与成灾机理研究——以晴隆县某不稳定斜坡为例

Study on the fertility characteristics and disaster mechanism of large-scale gentle slope landslides——Taking one unstable slope in Qinglong County as the case study

缓倾滑坡在我国西南地区广泛分布,该类滑坡具有规模大、成灾机理多样的特点,其滑坡从孕育发展到最终失稳破坏是一个缓慢而渐进的过程。本文以晴隆县某大型不稳定斜坡为例,开展地面调查、高密度电法、钻探及井探等多元地质勘探,研究缓倾滑坡孕灾特征及成灾机理。该斜坡因其不利的地质结构体、地形地貌特征及大量开垦、建房的人为活动影响,坡体发生了局部变形;针对此类具有不利地质、坡体结构且变形为初期蠕变斜坡,建议采取“综合监测工程+斜坡截排水沟的综合治理措施”完善地表排水系统,同时以监测为主实现防灾减灾目的,对类似地质灾害隐患点的减灾防灾工作具有一定借鉴意义。

Being widely scattered in the Southwest of China,the large landslide with gentle inclination is featured by large scale and various contributing mechanisms of disasters.Moreover,its landslide is a slow and gradual process from incubation and development to final instability and destruction.In the paper,it carries out research on the inoculation features of large landslide with gentle inclination and its contributing mechanism of disasters by relying on ground survey,high-density resistivity method,drilling,well exploration and other relevant multivariate geological exploration methods with one large unstable slope in Qinglong County as the case study.Due to the serious influence of unfavorable geological structure,topographic and geomorphic features and considerable human activities ranging from reclamation to house construction,part of the slope has been deformed to some extent.The comprehensive treatment method of comprehensive monitoring engineering and slopegutter is supposed to be taken in accordance with such unfavorable geological conditions and slope structure considered as the creep type in the initial stage,which is conductive to improving the surface drainage system in this regard.Meanwhile,real-time monitoring must be implemented for disaster prevention and reduction.Moreover,it is of certain reference significance for the similar hidden trouble areas of geological disasters.