陕西地震灾区滑坡类型及其时空分布特征——以略阳县为例
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摘要
文章以"略阳县"为例,对受汶川地震影响的陕西省重灾县滑坡进行统计分析研究。研究结果显示以略阳为代表的陕西重灾县滑坡灾害极为发育,滑坡类型以堆积层滑坡为主、黄土滑坡次之、岩质滑坡最少。滑坡发育在时间上具有年际与年内的集中期特点,在空间上主要分布于低中山区,平面上主要分布在县城周围人类工程活动强烈区。此外,滑坡的发育分布是地形地貌、地层岩性、地质构造、气象水文及人类工程活动等多种影响因素耦合的结果,地震作用主要是通过能量的传递对斜坡产生短期促滑影响和长期稳定性扰动。
Taking Lueyang country as example,the landslide of severely disaster country in Shaanxi province affected by Wunchuan earthquake was studied by statistical analysis. The result shows that landslide hazards of severely disaster country by taking Lueyang as the representative in Shaanxi province develop well,the landslide could be divided into three types: debris landslide、loess landslide and rock landslide,and the number of debris landslide is most,rock landslide is fewest,loess landslide is in the middle. The landslide development has the characteristics of concentracted period of interannual and years in time,in the space of the facade,the landslide is mainly distributed in the low and middle mountain area,and in the plane,the landslide is mainly distributed in the human engineering activity strongly district. In addition,development and distribution of landslide is the result of topography,fomation lithology,geological structure,hydrometeorology,human engineering activities and other influencing factors such as coupling,the seismic action generate the effect of short-time slip promoting and long-term disturbance for stability of landslide by transfer of energy.
引文
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