Study on movement characteristics of landslide considering earthquake magnitude and duration time

Abstract

China, a mountainous country with developed seismic fault zones, frequently experiences landslides triggered by earthquakes, so it is crucial adjective to explore the movement characteristics of landslides caused by earthquake. Utilizing the Daguangbao landslide as a case study, this paper analyzes movement characteristics of landslide under earthquake magnitude and duration time by means of numerical simulation and control variable methods. Firstly, the original topographic conditions and earthquake magnitude of Daguangbao landslide are restored, and its displacement movement characteristics is studied. Secondly, the landslide movement characteristics under different earthquake magnitudes (VI, VIII, VIII, IX) and duration time (10 s, 20 s, 30 s, 40 s, 50 s, 60 s) are obtained through 27 displacement monitoring points on three sections. Finally, the displacement–time formulas of Daguangbao landslide with different earthquake magnitudes are obtained by linear and nonlinear fitting. The research results show that: (i) The formation process of Daguangbao landslide can be summarized into the following four stages: Stage of earthquake wave shatters slope body; Stage of the formation of main sliding surface; Stage of the sliding of main sliding body; Stage of the sliding accumulation. (ii) In the case of earthquake magnitudes VI, VII and VIII, the landslide displacement increases linearly with the earthquake duration time. (iii) In the case of earthquake IX, the landslide displacement increases first and then decreases with the increase of earthquake duration time. The research reveals the mechanical mechanism of landslide under earthquake action, which provides reference and guidance for the study of the motion characteristics of earthquake landslides, and provides a basis for landslide control and disaster prevention and reduction.