汶川地震前后都江堰山区滑坡滑动距离影响因素变化分析

发布时间：2018-06-08 00:43

本文选题：都江堰白沙河 + 汶川地震　；参考：《地质力学学报》2017年06期

【摘要】：滑坡滑动距离作为滑坡防灾减灾的主要评价指标之一,不仅受滑坡体积和落差的影响,还与滑坡运动的地质环境作用相关。本文在对都江堰地区51个地震滑坡、16个降雨滑坡详细调查编目的基础上,采用数理统计方法分析了斜坡原始坡度、滑坡前后缘高差、滑坡平面形态、体积、滑体平均厚度及坡面摩擦系数等6个因素与滑坡水平滑动距离的相关性,借此厘清了汶川Ms8.0级大地震前后不同因素对不同类型滑坡运动的贡献大小,进而构建了不同成因类型滑坡的滑动距离预测关系式,可为龙门山区的滑坡防灾减灾工作提供参考。研究表明:影响都江堰地区地震滑坡运动距离的主要因素有滑坡体积(lg V)、斜坡原始坡度(α)、滑坡平面形态(R)和滑坡前后缘高差(ΔH);而控制降雨滑坡运动距离的主要因素为滑坡前后缘高差(ΔH)、滑坡体积(lg V)、斜坡坡度(α)和斜坡表面摩擦系数(μ);汶川地震后,影响该地区降雨滑坡滑动能力的因素发生了变异,各因素与滑坡滑动距离的相关性较弱,显示出其贡献率在急剧减弱,仅滑坡体积(lg V)与滑动距离的相关性较强。
[Abstract]:As one of the main evaluation indexes of landslide disaster prevention and mitigation, landslide sliding distance is not only affected by landslide volume and drop, but also related to the geological environment of landslide movement. On the basis of detailed investigation and cataloguing of 51 earthquake landslides and 16 rainfall landslides in Dujiangyan area, the original slope degree, the height difference between front and rear margin of landslide, the shape and volume of landslide plane are analyzed by mathematical statistical method. Six factors, such as the average thickness of sliding body and friction coefficient of slope surface, are related to the horizontal sliding distance of the landslide, so as to clarify the contribution of different factors to the movement of different types of landslides before and after the M _ S 8.0 Wenchuan earthquake. Furthermore, the sliding distance prediction formula of different types of landslides is constructed, which can be used as a reference for landslide prevention and mitigation in Longmen Mountain area. The results show that the main factors affecting the movement distance of earthquake landslide in Dujiangyan area are the volume of landslide (LG / V), the original slope (伪) and the difference of height between front and rear edge (螖 H ~ (+) of landslide, and the main cause of controlling the distance of landslide movement by rainfall The results show that the slope gradient (伪) and the friction coefficient of slope surface (渭) are the difference of height between front and rear margin of landslide (螖 H _ (+), volume of landslide and volume of landslide, and the friction coefficient of slope surface (渭 ~ (g), after Wenchuan earthquake, The factors affecting the sliding ability of rainfall landslide in this area have been changed, and the correlation between each factor and the sliding distance of landslide is weak, which shows that its contribution rate is weakening sharply, and only the volume of landslide (LG V) has a strong correlation with the sliding distance.
【作者单位】：中国地质科学院地质力学研究所;国土资源部新构造运动与地质灾害重点实验室;中国科学院水利部成都山地灾害与环境研究所;
【基金】：国家自然科学基金(41502339,41602367) 中国地质科学院基本科研业务费专项经费(YYWF201523) 中国地质调查局项目(DD20160267,DD20160271)
【分类号】：P642.22

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