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2015年5月20日,贵阳市云岩区海马冲宏福景苑小区后山突发山体滑坡灾害,滑坡体积约6 000m3,造成楼房倒塌、人员伤亡。经调查分析表明:(1)持续强降雨是诱发此次山体滑坡的主导因素,由于强降雨造成残坡积层及下部强风化泥质白云岩裂隙岩体中形成静水压力和渗透压力,增加了下滑力,导致滑坡失稳下滑;(2)陡峭的地形条件使该边坡易于失稳,狭窄的空间导致滑坡体势力转换成动能过程短、冲击能量大,使其破坏形式表现出快速冲切的特征;(3)该边坡区域地质构造特征主要表现为单斜构造,顺向坡,节理发育,是此次滑坡失稳的重要因素,其最终结果是形成“结构崩溃式滑坡”。
On May 20, 2015, a sudden landslide disaster occurred in the back hill of Fuhongyuan Community, Haizhu Hongyun District, Yunyan District, Guiyang City. The landslide volume is about 6,000m3, causing the buildings to collapse and cause casualties. The investigation and analysis show that: (1) Continuous heavy rainfall is the predominant factor causing the landslide. Due to the heavy rainfall, residual water accumulation and hydrostatic pressure and osmotic pressure are formed in the fractured rock mass of the dolomite rock mass with lower strong weathering, increasing Slippery force, causing landslide instability decline; (2) Steep terrain conditions make the slope easy to instability, narrow space lead to landslide body forces into kinetic energy is short, the impact energy is large, so that the destruction of the form of rapid punching (3) The geological structure features of this slope area are mainly characterized by monoclinic structure, forward slope and joint development, which are important factors of the landslide instability. The ultimate result is the formation of “structural collapse landslide” .