贵州省贵定县定东小学滑坡形成机制

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。

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

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 Dingdong 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 scientific 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 geological 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 special topography and low compaction degree filling is internal cause of landslide, and longtime rainfall infiltration is external cause.Conclusion] Unreasonable artificial fill is the direct reason of the landslide, and landslide could slide along the interface between filling and clay layer.