Study On Aero-dynamics Of Yigong High-speed And Long-runout Giant Landslide

A giant landslide occurred in the Yigong Bomi district in Tibet province of China in April, 2000. It ran out about 8 kilometers away with a giant volume of rock and soil(3×108m3) and was named the Yigong high-speed and long-runout giant landslide.According to the behavior in time and space, a high-speed and long-runout landslide can be divided into three stages: start-up phase, short-runout phase and long-runout phase. Generally, the landslide will achieve a high speed at start-up phase. When separated from the mother body, it will glide in the sky because of high-speed and certain initial height. This is the short-runout phase which has a significant effect of aero-dynamics. Then it collides with the ground and breaks up into rock debris and runs far away, this is the long-runout phase. Most research work was done for the start-up phase and the collision in the past years, but fewer about the aero-dynamics. Based on the Yigong high-speed and long-runout giant landslide, this thesis has done some experimental research, numerical and theoretical analyses listed as belows:1. The related research references on the high-speed and long-runout landslide were collected and collated.2. After a comprehensive study on aero-dynamics, the wind tunnel test models were designed and conducted for the Yigong landslide.3. Using the experiment results, the time and space characters in different phases of the Yigong landslide were revealed by numerical analysis. 4. The formulas of shock wave velocity and the corresponding attenuation law were derived and then used in the Yigong landslide to form the conditions of shock wave.The research work presented in this thesis was supported by the National Natural Science Foundation of China with the granted number 40602035.