四川省万源市花楼乡董家梁滑坡特征及成因机制研究

万源市花楼乡董家梁滑坡属于典型的四川盆地盆周山区红层地层滑坡.通过现场调绘、工程地质勘探等手段,揭示该滑坡为强大水压力起主导作用的滑动变形破坏.根据滑坡滑动后的空间形态及残留体特征,将滑坡划分为滑坡启动区(A区)、滑坡西侧推挤滑动区(B区)、滑坡东侧牵引滑动区(C区)三个部分.研究表明滑坡启动始于地下水活动强烈的中部区域(A区),水压力随雨量增加而急剧增长,该区岩体受水压力推挤沿层面及侧裂结构面发生剪切破坏,形成楔形体滑动,同时牵引B区和C区岩体产生推挤、拉张、牵引滑动破坏.

Study on characteristics and formation mechanism of Dongjialiang landslide in Hualou Town, Wanyuan City, Sichuan Province

Dongjialiang landslide in Hualou Town of Wanyuan City is a typical red bed landslide in Sichuan Basin. Several means such as field annotation and engineering geological exploration were used to reveal that this landslide was a slide deformation and failure mainly caused by powerful water pressure. Based on the spatial shape and residue characteristics after the sliding, the landslide was divided into the promoter zone (Zone A), pushing slide zone at the west side of the landslide (Zone B), and traction slide zone at the east side (Zone C). The study showed that the landslide started from the central zone (Zone A) where groundwater activity was intense. The water pressure rose sharply as the rainfall increased. Pushed by the water pressure, the rock at this zone was exposed to shear failure along the surface and sideslip surface, forming a wedge sliding while pulling the rocks at Zones B and C to produce pushing, tension, and traction sliding failure.