论文部分内容阅读
“4·20”芦山地震为龙门山断裂带南端上的浅源构造地震,震中位于四川省芦山县龙门乡马边沟,最大烈度达IX度,龙门乡99%以上房屋受损。乡境内因地震形成35处地质灾害,主要类型为滑坡、崩塌,分别占40.0%、60.0%,乡境内5个村有分布。崩塌失稳模式为震动-剥落、震动-拉裂-滑移、震动-拉裂-错落;滑坡失稳模式为震动-拉裂-蠕滑。地震地质灾害除受控于地震触发作用,陡峻的地形、地形与高程放大效应特征突出外,强风化卸荷作用也是地质灾害产生的物质基础。乡境内以崩塌危害较为严重。开展震中地震地质灾害特征研究,预测灾害发展趋势,对灾区安置点规划、灾后3 a恢复重建都将具有重要的指导意义。
“4.20” Lushan earthquake is the shallow source tectonic earthquake on the southern end of the Longmenshan fault zone. The epicenter was located in Mabiangou, Longmen Township, Lushan County, Sichuan Province with the maximum intensity of IX degrees. More than 99% of houses in Longmen Township were damaged. In the township, 35 geological disasters were formed due to earthquakes. The main types are landslides and landslides, accounting for 40.0% and 60.0% of the total respectively. There are 5 villages in the township. Collapse and destabilization modes are vibration-spalling, vibration-pull-slip-slip, vibration-pull-split-patch; landslide instability mode is vibration-pull-slip-creep. In addition to being controlled by the triggering of the earthquake, the geological disasters of the earthquake are characterized by steep topography, topographic and elevation amplification effects, and the strong weathered unloading effect is also the material basis for geological disasters. Township to collapse more serious damage. Carrying out the research on the characteristics of epicenter earthquake geological disasters and predicting the trend of disaster development, it will be of great guiding significance to the planning of resettlement sites in the disaster areas and the reconstruction and reconstruction after 3 days of disasters.