"充填式"滑坡是指古沟谷地貌被新沉积物充填覆盖,在开挖影响下,充填物沿新老界面发生滑动而形成的滑坡.本文研究对象为浅挖路段,地形平坦,最大挖深约 17m,开挖后两侧边坡土石界面呈典型的"V"字形,后缘约 200 m处出现拉张裂缝,初步判断滑坡位于古河道上.为准确查明滑坡特征,在物探和钻探的基础上采用深部位移监测手段.结果表明,滑坡目前处于蠕滑阶段;滑坡前缘滑动面为土石界面,后段为风化岩层,滑动面与地下水位线基本一致,并非完全沿充填物界面发生破坏.
The so-called"filling type"landslide is the landslide formed when the ancient gully landform is filled and covered by new sediments,and the filling materials slide along the new and old interface under the influence of excavation.The research object is a shallow excavation section with flat terrain and a maximum excavation depth of about 17 m.After excavation,the soil and rock interface on both sides of the slope presents a typical"V"shape,and tension cracks appear at the rear edge of about 200 m.It is preliminarily judged that the landslide is located on the ancient river channel.In order to accu-rately identify the characteristics of landslide,the deep displacement monitoring method is used on the basis of geophysical exploration and drilling.The results show that the landslide is in creep stage at present.The sliding surface of the landslide front is the soil-rock interface,and the rear part is the weathered rock layer.The sliding surface is basically consistent with the groundwater level,and the failure occurs not completely along the filling interface.