The Formation Mechanism Of Landslide Of Loess And Bedrock Contact Surface

There are many landslides in our country, and the most developing landslide in the northwest is the loess landslide.. By scholars of loess landslide and engineering and technical personnel of the research shows that in order to further refine the loess landslide, according to smooth development position and slide body composition, loess landslide classification in loess layer landslide, bedrock interface landslide, rock along layer landslide and rock cutting landslide four basic types, this kind of division in the loess landslide play an important role in disaster prevention and control. So the study of loess bedrock landslide is helpful to strengthen the prevention and control of the landslide, and has a profound significance..In the Yan’an City Qiao Gou Zhen Dong Shi Li Pu landslides, I in view of dynamic development and use of engineering geological analysis and numerical simulation methods of comprehensive research work from the aspects of the basic characteristics, mechanism and numerical simulation. After exploration and drilling found Qiao Gou Zhen landslide belongs to the contact between loess and bedrock surface landslide, this paper mainly to Qiao Gou Zhen landslide as an example of loess and bedrock contact surface of the landslide of the basic characteristics and mechanism, and use different method of calculating this landslide stability calculation of verification.The main results are as follows:(1) there are two reasons for the landslide in the bridge.. First, the landslide can slide with the basic forming conditions. The structure of the "double layer heterogeneity" of the overlying loess layer over the Jurassic mudstone is the structure of the slope.. Second, the landslide can slide also need to be able to break the balance of mechanical external predisposing factors, such as large-scale slope toe excavation.(2) slide at the top of the Loess vertical fractured and fell into the caves are well developed in the slope of the continuous excavation, top tension gap further expansion, sliding force increases. Finally, when the anti slide force less than the decline in the force and slippage, when after the occurrence of a sliding, landslide accumulation energy obtained certain release, sliding of the landslide occurred to some extent stagnation immediately into slow creep sliding stage.(3) landslide in front sliding sliding body toward the airport is progressive expansion deformation characteristics, by the master slide and traction section of the junction to other parts of the expansion, also landslide to the left and right sides there are creeping deformation, landslide sliding sliding body along the Loess bedrock contact surface disintegration sliding.