高位远程滑坡动力侵蚀犁切计算模型研究

doi:10.13722/j.cnki.jrme.2020.0062

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Abstract The high-location and long run-out landslides usually have typical dynamic erosion characteristics，resulting in obvious increments of both the landslide volume and the moving distance，and consequently，inducing serious geological disasters due to misjudgment of the disaster area. In this paper，a new dynamic erosion model for evaluating the plowing behaviors of a long run-out landslide through the substrate¢s surface material was proposed based on the sliding block-spring model and the plowing resistance model. The developed model describes that，during the movement of sliding blocks，the resistance at the base produces a scraping force on the substrate¢s surface material and a scraping layer forms，and that the scraping layer pushes against the front accumulation，similar to plowing a field，and will be subjected to reaction named as plowing resistance. According to the relationships among the plowing resistance，the plowing passive zone and the motion path，two detailed kinds of plowing models including pushing and shearing types were put forward. The corresponding mechanical expressions of the base resistance were established and a two-dimensional program was compiled. Areletuobie flowslide in Xinyuan county，Xinjiang Autonomous region，was illustrated to analyze the motion features of long run-out landslides, and variations of the plowing volume and depth with the specific resistance were revealed. Comparisons among the developed model，sled model，equivalent fluid model and liquefaction model show that the developed model has a similar trend with the equivalent fluid model and the sled model，and is more stable than the liquefaction model. It is also shown that the peak value of the movement velocity calculated by the developed model is smaller than that by the other three models，which is mainly due to the energy dissipation of spatial plowing effect. As a mechanical model which can quantitatively calculate the volume increment of landslides in the process of dynamic erosion，the developed model has clear concept and simple calculation，and provides an effective supplement to the kinematic model of landslides.

Key words： slope engineering plowing model high-location and long run-out landslide dynamic erosion sliding blocks

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	YIN Yueping
	WANG Wenpei

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YIN Yueping,WANG Wenpei. A dynamic erosion plowing model of long run-out landslides initialized at high locations[J]. , 2020, 39(8): 1513-1521.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0062 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I8/1513

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