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2008年5月12日汶川MS8.0级强震诱发了大规模的崩塌滑坡地质灾害,不仅造成了巨额的经济损失,而且造成了众多的人员伤亡。汶川地震诱发崩滑分布受发震断层影响明显,而且在断层两侧不对称分布。分析表明汶川地震诱发崩滑与地震烈度存在相关性,但没有明确的对应关系,与震级、地震动峰值加速度关系较为密切。利用汶川地震在龙门山断裂带及附近地区获得的近40个台站的强震记录,对地震诱发崩滑与地震动峰值加速度的关系进行了初步研究,得到如下结果:地震诱发崩滑与地震动峰值加速度存在正相关性;水平向地震动水平对斜坡稳定性影响更大;在龙门山断裂带及其附近地区存在0.2g的地震动峰值加速度分界线,大于此值时崩滑明显增多。研究结果表明利用地震动峰值加速度对地震诱发崩滑进行研究具有一定理论和实际意义。
On May 12, 2008, the MS8.0 Wenchuan earthquake triggered large-scale landslide geological disasters, which not only caused huge economic losses, but also caused a large number of casualties. The collapse-slip distribution induced by the Wenchuan earthquake is obviously affected by the seismogenic fault and is asymmetrically distributed on both sides of the fault. The analysis shows that there is a correlation between the earthquake-induced collapse and the Wenchuan earthquake, but there is no clear correspondence between the magnitude and the peak acceleration of earthquakes. Based on the strong earthquake records of nearly 40 stations in the Longmen Shan fault zone and its vicinity obtained by the Wenchuan earthquake, the relationship between earthquake-induced collapse and peak acceleration of ground motions was studied. The results are as follows: Earthquake-induced collapse and earthquake There is a positive correlation between the peak acceleration and the peak acceleration. The level of horizontal ground motion has more influence on the slope stability. There is a 0.2 g peak acceleration boundary between the Longmenshan fault zone and its vicinity. The results show that it is of theoretical and practical significance to study the earthquake induced collapse by using the peak acceleration of ground motions.