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Wu Y.,Chongqing Bureau of Geology and Mineral Exploration | Wu Y.,PLA Logistical Engineering University | Liu D.-S.,Chongqing Bureau of Geology and Mineral Exploration | Zhou Z.-H.,Chongqing Bureau of Geology and Mineral Exploration
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2015

The mobility assessment model for landslide mass can be used in calculating the speed, sliding distance, impact energy and affected area of landslide. It's the key technology for risk assessment of landslide. In the conventional methods, the landslide mass is usually assumed as the mass point or rigid block, and the dynamic assessment process does not take the disintegration energy consumption into account. An assessment model for landslide mass in slipping process considering the disintegration energy consumption is proposed. In the model, the landslide mass is assumed as a system consisting of two mass points and a dashpot, and the slipping process is simplified as a deformation body in plan motion. Furthermore the stress-strain characteristics of landslide mass follow the rules of soil residual strength from repeated direct shear tests. The motion equations of the mobility assessment model and the relevant formula for calculating viscosity resistance force of the dashpot are established. The equation is used to deduce the formula for intensity indexes (including slipping velocity, impact energy and sliding distance). As a case study, a landslide project is analyzed to illustrate this mobility assessment model. The results show that the proposed model conforms to the energy transformation rules of landslide mass, and its results are closer to the reality than those of the conventional methods. It is more convenient than the numerical methods. ©, 2014, Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering. All right reserved. Source


Wu Y.,PLA Logistical Engineering University | Liu D.,Chongqing Bureau of Geology and Mineral Exploration | Li S.,Anhui University of Science and Technology
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2012

Impact energy is an important basis for landslide vulnerability assessment. Internal collapse of landslide mass dissipates part of the kinetic energy in the process of landslide. Calculation equations of impact energy are proposed based on the study of interaction mechanism between landslide mass and disaster-affected bodies. Based on the equations, a simplified model for impact energy calculation is put forward. At the same time, a coefficient of impact effect is defined, which can reflect the impact energy intuitively. The coefficient of impact effect indicates that the impact energy and internal energy dissipation of landslide mass are determined together by the characteristics of landslide and disaster-affected bodies. Increment in the coefficient of impact effect means that the impact energy decreases and the internal energy dissipation of landslide mass increases; and vice versa. The results of case study show that the impact energy calculated by the simplified model is consistent with those obtained by experiments, and it is more accurate than the result calculated by the method without consideration of the internal energy dissipation. Source


Wu Y.,PLA Logistical Engineering University | Liu D.,Chongqing Bureau of Geology and Mineral Exploration | Li M.,PLA Logistical Engineering University
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2011

In the processes of landslide mass sliding and impacting on element at risk, the internal collapse of landslide mass will dissipate part of kinetic energy. But in practice, this part of energy is not taken usually into account. The discrete element method(DEM) is adopted to get impact force-time curves; and the impact energy conversion equation is also deduced based on impulse law and energy conservation law. With the analysis of the energy dissipation principle in the sliding and impacting processes of a practical rock slope, a comparison is made between the calculation method which takes both internal and external energy dissipations into account and the method which only takes external energy dissipation into account. The result shows that there is a significant difference between the two methods; and the internal energy dissipation can not be ignored. Moreover, the influence factors of impact energy and vulnerability for element at risk are both analyzed. The analysis result shows that impact energy is most sensitive to internal friction angle of landslide debris; second sensitive to distance between element at risk and landslide mass, gap length between joint segments, density of landslide mass and width of impact surface; last sensitive to the cohesion of landslide mass. In addition, the impact direction of landslide debris can simulataneously effect both impact energy and anti-impact energy. Source

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