【摘要】 2013年7月10日四川省都江堰市中兴镇三溪村五里坡因持续大暴雨引发高位滑坡,滑坡呈现高差大、滑速快、滑距长、方量大、伤亡多等特点。野外观察发现,滑坡整体形态为倒"J"状,根据滑坡的滑动和堆积特征,可分为上部滑源区、中部滑流区和下部堆积区。滑坡区上部出露白垩系灌口组红色粉砂岩与泥岩互层,下部为块状砾岩,岩体结构为顺向坡。分析认为:地形陡峭、岩体破碎、地震作用等脆弱的地质环境和人类工程活动、持续强降雨等因素共同引发了本次特大型地质灾害,滑坡发生前48 h的544 mm累计降雨是滑坡发生的直接原因。在致灾模式上,主要呈现地震拉裂→基岩崩滑→加载失稳→滑流推碾→堆积停流的模式。更多还原

【Abstract】 The persistent heavy rain triggered Wulipo landslides in Sanxi Village,Dujiangyan,Sichuan Province in July 10,2013. The features of landslide include big difference of elevation,fast speed of sliding,long run-out distance,large volume,heavy casualties and so on. Landslide overall shows an inverted "J"shape;and it can be divided into the upper slide source region,central slipstream and lower accumulation area. The upper stratum of landslide is Cretaceous Guankou Formation red siltstone and mudstone; the lower is massive conglomerate including mudstone weak surface; the landslide’s ramp structure is forward slope. Fragile geological environment including terrain steep ness,rock crushing,earthquake,with human engineering activities and continued heavy rainfall together,led to the major geological disasters; continuous 48 h of 544 mm rainfall is the direct cause of Wulipo landslide. The disaster mode is earthquake crack→bedrock collapse and slide→loading and instability→slipstream and pushing→accumulation and stopped-flow.更多还原