鲁甸8.03地震区甘家寨特大型滑坡发育特征及演化过程研究  

DEVELOPING CHARACTERISTICS AND EVOLUTION PROCESS OF GANJIAZHAI LARGE SCALE LANDSLIDE IN LUDIAN 8. 03 EARTHQUAKE AREA OF NORTHEAST YUNNAN

作　　者：徐永强[1] 殷志强[1] 撒兰鹏 

机构地区：[1]中国地质环境监测院,北京100081 [2]云南地质工程勘察设计研究院昭通分院,昭通657000

出　　处：《工程地质学报》2016年第4期550-558,共9页Journal of Engineering Geology

基　　金：国家自然科学基金项目(No.41372333);国家地质调查项目(No.12120114238501)资助

摘　　要：2014年8月3日鲁甸县MS6.5级地震造成了617人死亡,并诱发了大量次生滑坡崩塌灾害。其中红石岩滑坡堆积体方量最大,甘家寨滑坡造成的人员伤亡最多。根据笔者对甘家寨特大型滑坡的实地调查和遥感影像解译,分析了该滑坡堆积体的发育特征及演化期次,从活断层破裂角度研究了滑坡的主控因素,认为甘家寨滑坡分为两个发育期次,最新一期滑坡体(本次地震诱发)长约700m,宽约250m,滑体面积约18×104m^2,体积约140×104m^3,是在20ka BP前发生的古崩塌堆积体在地震诱发下的复活型滑坡,受控于NW向的下水沟断层。最后建议进一步防范鲁甸8.03地震次生灾害的可能危险,加强该地区活动断层的复发周期研究,为灾害恢复重建中的地质环境安全提供基础依据。At 16：30 on August 3, 2014, an Ms 6. 5 earthquake happened in Longtoushan Town, Ludian County, Zhaotong, in Yunnan Province, and caused 617 deaths and triggered a large number of geohazards. The Hongshiyan landslide and Ganjiazhai landslide are notable for their largest scales in mass and many casualties. According to field survey and remote sensing image interpretation of Ganjiazhai landslide by authors, the developing characteristics and evolution periods of landslides mass are analyzed, and the key triggering factors of this landslides are studied from the perspective of active fault rupture. The Ganjiazhai landslides can be divided into two occurred times. The latest landslide mass is of 700m and 250m in length and width, and 690, 000m^2 and about 8. 7million m^3 of landslides mass area and volume, respectively. It is triggered by the Ludian earthquake from the ancient landslide or avalanche that occurred about 20kaBP, and these two occurred times were all controlled by Xiashuigou Holocene faul that extended by NW direction. At last, this article suggests preventing the risks of landslide in further in Ludian earthquake area, and should strengthen to study the recurrence period of Zhaotong-Ludian active faults in the region, in order to provide the basis for geological environmental safety in the geohazards reconstruction after the earthquake.

关 键 词：鲁甸地震 甘家寨 特大型滑坡 发育特征 演化过程 

分 类 号：P642.22[天文地球—工程地质学]