贵州省贵定县定东小学滑坡形成机制

Landslide Formation Mechanism at Dingdong Primary School of Guiding County in Guizhou Province

[目的]贵州省贵定县定东小学滑坡发生后,造成学校食堂、住宿楼地面、墙体出现开裂,直接威胁学校建筑物及附近民房、道路安全,迫切需要查明其形成的机制,为滑坡工程治理提供可靠的依据。[方法]采用了钻探、浅井、高密度电法等手段和方法调查了滑坡体结构和变形特征,并用Adina软件分析了滑坡在自然和暴雨情况下应力应变场和变形破坏特征。[结果]人工填土和降雨是滑坡形成的主要原因,滑坡破坏模式为蠕滑拉裂型。特殊的地形地貌和低压实度填方是导致滑坡最主要的内因,而长时间的降雨入渗是外因。[结论]不合理的人工填土是滑坡发生的直接原因,滑坡会沿填土与黏土层交界面处发生滑动。

[Objective] A landslide occurred at Dingdong Primary School which is located in the southeast area of Guiding County in Guizhou Province. The canteen, accommodation, the ground floor and wall of Ding- dong Primary School were cracked. The landslide is a direct threat to the safety of school building, the nearby houses and road, so it is necessary to find out the mechanism of its occurrence, and to provide a scien- tific basis for landslide treatment. [Methods] The methods such as drilling, well, high density resistivity were used to investigate the structure and deformation characteristics of the landslide, combining with geo- logical and environmental conditions, and the formation mechanism of the landslide are studied. At the same time, the stress-strain field and deformation failure features of the landslide is analyzed by means of Adina software under conditions of the nature and rainstorm. [Results] The artificial fill and rainfall is the main reason for the formation of the landslide and the landslide failure mode belongs to creep-crack type. The spe- cial topography and low compaction degree filling is internal cause of landslide, and longtime rainfall infiltra- tion is external cause. [Conclusion] Unreasonable artificial fill is the direct reason of the landslide, and land- slide could slide along the interface between filling and clay layer.