Study on the rainfall and aftershock threshold for debris flow of post-earthquake |
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| Authors: | Siming He Dexin Li Yong Wu Yu Luo |
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| Institution: | (1) State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection, Chengdu University of Technology, Chengdu, 610059, China |
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| Abstract: | Due to the special condition of provenance and disaster environment after “5·12” Earthquake, the probability and conditions
of the occurrence of gully debris flow change greatly after the event, which make it difficult to prevent disaster effectively.
In this study the hydrological model of ground water table in loose sediment is established. According to infinite slope theory,
the safety factor of deposits is defined as the ratio of resistance force to driving force. The starting condition of post-earthquake
gully debris flow is clearly studied by analyzing the effects of rainfall intensity, seismic strength, slope gradient and
mechanical properties on the balance of accumulation body. Then the formulas of rainfall and aftershock threshold for starting
of gully debris flow are proposed, and an example is given to illustrate the effect of rainfall, aftershocks and their coupling
action on a debris flow. The result shows the critical rainfall intensity decreases as the lateral seismic acceleration and
channel gradient increases, while the critical intensity linearly increases as the friction angle increases. |
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