The Foundation Of The Deformation And Failure Models To The Landslide With Double Sliding Plane And Reverse Rock-layer

The landslides we study are those with double sliding plane and reverse rock-layer. The interact of the two sliding plane and the antislipping action of the reverse foreside make them have special deformation and failure mechanism, only a few works have been done to study the deformation and failure mechanism of these landslides. The landslide with reverse rock-layer usually belong to creep-sliding landslide, mow most investigations are focus on the high speed landslide but not the creep-sliding landslide. So, it is great important to do some works on studying these landslides.In allusion to a certain landslide in Wuxu segment of Xiangshi Expressway, some works have been done to study the basic characters and formation conditions of the landslide, to find out it's geological genesis, material composition, mechanical properties, structure features and motion characteristics. The deformation and failure mechanism are analyzed based on these works and the geological factors are generalized of three factors: geological structures, rainfall and the creep characteristics of the materials of the sliding plane. So, the landslide is a creep-sliding landslide made of several factors. The whole sliding process is divided into three phases, deceleration creeping, stable creeping and acceleration creeping, based on the creep-sliding characteristics, and rheological model have been founded to reflect the creep-sliding characteristics.Laboratory physical model test is an important approach for study on stability and deformation and failure mechanism. Based on the laboratory physical model test, the deformation destruction course of the landslide of different status (natural state and reinforcement state) are simulated and the displacement of landslide of different testing procedures are studied. The date of the displacement are fitted in order to get the parameters of the rheological model. Finally, we compare the curve of the displacement of the rheological model with the date of the model test and draw the conclusion that the two curves coincide with each other and the rheological model reflect the creep-sliding characteristics well.In addition, we compare the curve of the displacement of the rheological model with the date of the monitoring and draw the same conclusion that the rheological model reflect the creep-sliding characteristics well.Finally, we use the rheological model to study other landslides and make good effects. That is to say, the rheological model have good applicability.