Analysis of Deformation Characteristics of a Filling Type Landslide on an Expressway
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.
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