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2014年8月3日云南鲁甸地震诱发了大量次生地质灾害,研究表明此次地震“小震大灾”的原因是前期干旱导致土体强度降低,在暴雨作用下引发大量次生灾害。在小震大灾的岩土性质基础上,通过分析地形地貌、地质条件、地震活动和极端干湿气候对地质灾害发育的影响,建立地质灾害易发性评价指标,利用GIS空间分析技术对震后灾区泥石流易发性进行了快速定量评价。结果显示,地震灾区地质灾害高、中、低易发区面积分别为6 865.87km2、15 102.72km2、9 869.06km2。其中高易发区主要集中于金沙江与牛栏江沿线,呈带状分布,以及受地层岩性的影响呈岛状等不均匀分布,今后在进一步的极端气候影响下,区域泥石流灾害有可能进一步发展
On August 3, 2014, a large number of secondary geological disasters were induced in the earthquake in Ludian, Yunnan Province. The study shows that the reason for this earthquake is that the previous drought led to the decrease of soil strength and triggered a large number of secondary rainstorms disaster. Based on the geotechnical properties of the small earthquakes and disastrous earthquakes, the paper analyzes the influence of topography and geology, geological conditions, earthquake activity and extreme wet and dry climate on the development of geological disasters, establishes the index of vulnerability assessment of geological hazards, and uses GIS spatial analysis technique After the disaster area debris flow prone to rapid quantitative evaluation. The results show that the areas with high, medium and low risk areas of geological disasters in the earthquake-stricken areas are respectively 6 865.87km2, 15 102.72km2 and 9 869.06km2. The high-prone areas are mainly concentrated along the Jinsha River and the Ngau Tau River. They are zonally distributed and are unevenly distributed in the shape of islands due to the lithology of the strata. In the future, under the influence of further extreme climate, the regional debris flow disaster may further develop