未完全受阻地震滑坡运动距离的影响因素及机制分析

发布时间：2018-06-24 19:41

本文选题：未完全受阻滑坡 + 运动距离　；参考：《地震地质》2017年04期

【摘要】：地形条件、启动机制和岩性条件是滑坡运动的主要影响因素。通过分析汶川地震诱发的215处体积1×10~4m~3的未完全受阻滑坡的运动场地地形条件、岩性、地震烈度、岩层倾向与坡向的关系,建立各影响因素的分类指标,分析各影响因素对滑坡运动距离的影响及作用机制。研究结果表明:场地地形条件不仅显著地影响了大型滑坡的运动距离,而对中小型滑坡同样有效,是同等规模下滑坡运动距离产生差异的最主要影响因素。运动场地地形条件中沟谷顺直型滑坡的运动距离最大,随后依次为凹面型、阶梯型、沟谷偏转型、坡脚堆积型和坡面堆积型,由岩性、地震烈度和岩层倾向与坡向关系确定的滑坡成因模式或启动机制对中小型规模的滑坡运动距离影响不显著。对于体积1×10~6m~3的大型滑坡,同等规模下中等硬度岩性的运动距离大于坚硬岩体和软岩;在Ⅸ—Ⅺ度地震烈度区,与滑坡点密度和面积密度的分布规律相反,滑坡运动距离随烈度的增加而减小;坡体结构虽然影响了滑坡发育的分布规律和成因模式,但对滑坡运动距离的作用却不显著。
[Abstract]:Topographic conditions, start-up mechanism and lithologic conditions are the main influencing factors of landslide movement. Based on the analysis of the relationship between the terrain condition, lithology, seismic intensity, rock tendency and slope direction of the unobstructed landslide with a volume of 1 脳 10~4m~3 induced by the Wenchuan earthquake, the classification indexes of the influencing factors are established. The influence of various factors on the distance of landslide movement and its mechanism are analyzed. The results show that the site terrain condition not only significantly affects the movement distance of large landslide, but also is effective for small and medium-sized landslide, which is the main influencing factor for the difference of landslide movement distance in the same scale. In the terrain conditions of sports site, the movement distance of the trench and straight landslide is the largest, followed by concave type, ladder type, valley deflection type, slope foot accumulation type and slope surface accumulation type. The landslide origin model or start-up mechanism determined by the relationship between seismic intensity and rock inclination and slope direction has no significant effect on the movement distance of small and medium-sized scale landslide. For large landslide with volume of 1 脳 10~6m~3, the movement distance of medium hardness rock at the same scale is larger than that of hard rock and soft rock, and the distribution law of density and area density of landslide point is contrary to that of seismic intensity zone of degree IX-XI. The distance of landslide movement decreases with the increase of intensity, and the structure of slope body affects the distribution law and genetic model of landslide development, but the effect on the distance of landslide movement is not significant.
【作者单位】：西南科技大学土木工程与建筑学院;
【基金】：国家自然科学基金(41272297,41401195,41472325) 四川省科技厅项目(2014JY0121) 四川省教育厅重点项目(14ZA0095) 绵阳市科技计划项目(16S-02-4)共同资助
【分类号】：P642.22

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