Study On Kinematical Model And Sliding Distance Forecasting Of Loess Landslides

In the loess area, the prediction of the risk of loess landslide's landslip which can provide evidences for the assessment of geological landslide disasters seems quite important, in terms of the accurate prediction of the risk of loess landslide geological disasters.We can put the devastating landslides into three styles in the loess area: high-speed and long-range landslides, landslide-mudflows and Faulted landslides. Each of them has their own features: First, high-speed and long-range landslide can be divided into two processes. In the first process, the sliding masses separate from the slope and caves quickly. In the second process, the sliding masses will slide for a long distance when they hit the first level at the foot of the slope. Second, the sliding masses slide along with the slippery surface and transform into mudflows when water takes part in, then landslide-mudflows are formed. And keep sliding along the channel and accumulate at the end of the channel. Third, for the faulted landslides,the sliding masses slide from one imbalanced position to another new equilibrium position.The movement theories of high-speed and long-range landslide include speeding-up effect, keeping-speed effect and slowing down-speed effect. This passage focuses on the size of comprehensive friction angle which is produced when the sliding masses run into slideway with the keeping-speed effect. The process of the formation of landslide-mudflows includes clastic process and making pulp process, making the sliding masses show fluid or quasi-fluid with the water's influence. For the faulted landslides masses,the antislip force of the sliding mass decreases because of the precipitation or artificial excavation, then the sliding masses fall from one imbalanced position to another new equilibrium position. The residual strength which is achieved by appling saturated-repeated direct shear experiment does calculation to the known sliding mass. In the the faulted landslides,we can work out the comprehensive friction angle oppositely according to the landslip of WoHushan landslide and analyze the relationship of the comprehensive friction angle and measured parameters. In the landslide-mudflows, we can work out the comprehensive friction angle according to Huaxian's landslide-mudflows, and analyze the application of the comprehensive friction angle in the prediction of landslide-mudflows landslip. In the high-speed and long-range landslide, we can woke out the comprehensive friction angle of the 9 known high-speed and long-range landslides landslip oppositely and analyze the values we have got, at the same time we can also verify the results of the known landslide landslip.Analyze the three styles of landslide's movement path equations, and build up the kinematics model according to the movement features of them, and calculate the landslip of each loess landslide according to experiments and measured parameters, at last analyze the kinematics model and calculate the loess landslide's landslip more accurately.