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| Study on calculation method of landslide impact and scraping variable |
| Received:October 22, 2020 Revised:December 22, 2020 |
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| DOI：10.7511/jslx20201022001 |
| KeyWord:impact and scraping impact loading passive yielding calculation method landslide |
| Author | Institution |
| 高杨 |
中国地质科学院 地质力学研究所 新构造运动与地质灾害重点实验室, 北京 |
| 高浩源 |
长安大学 地质工程与测绘学院, 西安 |
| 李滨 |
中国地质科学院 地质力学研究所 新构造运动与地质灾害重点实验室, 北京 |
| 赵志男 |
长安大学 地质工程与测绘学院, 西安 |
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| Abstract: |
| In the dynamic process of a rapid and long runout landslide, the impact and scraping effect not only increases the volume and scale of landslide, but also leads to the increase of landslide disaster scope, leading to obvious errors of risk prediction and judgment and the occurrence of catastrophic events.At present, most of the calculation of variables such as scraping depth, scraping range and scraping volume of high-speed landslide is based on an empirical erosion rate algorithm and the mathematical method of backward calculation of scrap by volume increment.But in reality, the impact and scraping of high-speed landslide is the result of the mechanical yield failure between the impact force of sliding body and the surface scraping material.Based on contact mechanics, elastic-plastic mechanics and geotechnical mechanics, this paper puts forward the calculation method of scraping variable of surface scraping layer under additional impact load, and considers that vertical impact and tangential shear are two main action modes in the process of sliding mass impact and scraping effect.Combined with the actual material parameters of rock and soil mass, this paper finds that the plastic zone of the scraping layer is mainly the vertical fracture zone without considering the tangential load.However, when the tangential load is considered, the plastic zone of the scraping layer migrates along the tangential direction until the plastic boundary penetrates to the surface, which conforms to the actual situation and realizes the quantitative calculation of the scraping variable. |
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