Study On Quantitative Relation Between Displacement Vector Angle And Stability Factor & Its Optimized Design

Debris landslide, which includes all of the soil layer landslides, the accumulation landslides in mountainous district, and the loose accumulation landslides caused by constructing, unloading and weathering takes place in the Quaternary System and recent loose accumulation distributed. It has the characteristics of the broad distribution, the big scale, the strong burst and the serious destructiveness. Therefore, it will have a profound theoretical significance and vast economic profit to carry out the scientific prediction and control of this ksind of landslides.Supported by the projects of National Natural Science Foundation of China-"Responding Ratio Parameter to loading & unloading and Displacement Dynamic Prediction of the Debris Landslides"(Code No: 40672182) and"Dynamic Parameter to Displacement vector angle and Displacement Integrated forecast in polyphyletic information of the Debris Landslides"(Code No: 40872184), and selecting Zhangjiawan landslide and Bazimen landslide in the Three Gorge reservoir region as the example, the thesis has carried out a study on the displacement's message of the slope by means of the numerical simulation software-ABAQUS. The horizontal and vertical displacements are coupled by using the displacement vector angle and the displacement vector angle change, the mechanism of the displacement vector angle , especially in the character of time-space is studied profoundly. The relationship of displacement vector angle change and stability coefficients is depth investigated. Information and changes of displacement in landslide control project is studied. The change of stability after setting up anti-slide retaining wall is reflected in form of displacement vector angle. The application and significance of displacement vector angle are studied profoundly. The mainly research contents as follows:1. It is found that the displacement vector angle, an important displacement parameter of the displacement vector field, is a different from displacement or displacement velocity in dynamic property.2. The displacement vector angle of colluvial landslide is compositioned of different nature displacement. Different deformation stages have different variation. These changes fit a self-organizing feature, displacement vector angle shift from the disorderly orderly and then mutation from the orderly with the the development of instability.3. The displacement vector angle is determine by stress state of slope and it's evolutionary stage, the displacement vector angle dramatically reduced before sliding, this feature can serve as a criterion to make the evaluation of slope stability. Corresponding, the change of displacement vector angle were relatively stable before the overall instability, but dramatically increased before sliding,4. It is found that when mutation of the displacement vector angle appeared, the bigger the reduction factoris, the more effective the treatment is.5. Design Retaining structures by using strength reduction finite element method, the relationship between the interaction of rock media and the supporting structure can be considered, the internal force can be directly calculated. The method has a lot of advantages and prospects.