“1·11”镇雄灾难性滑坡滑动机制--高孔隙度土流态化启动与滑动液化  

MECHANISMS OF CATASTROPHIC LANDSLIDE ON JANUARY 11,2013, IN ZHENXIONG COUNTY:FLUIDIZATION INITIATION AND MOVEMENT LIQUEFACTION OF HIGH POROSITY SOIL

作　　者：姚鑫[1] 余凯[1,2] 张永双[1] 李凌婧 周能娟[1] 

机构地区：[1]中国地质科学院地质力学研究所国土资源部新构造运动与地质灾害重点实验室,北京100086 [2]中国地质大学工程技术学院,北京100083

出　　处：《岩石力学与工程学报》2014年第5期1047-1054,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：“十二五”国家科技支撑计划项目(2011BAK12B09);国家自然科学基金资助项目(40902059);中国地质调查局工作项目(1212010914025)

摘　　要：针对2013年1月11日云南省镇雄县果珠乡高坡村发生山体滑坡的特点及滑坡发生过程中存在的疑问,基于灾后及时地质调查、滑坡测量、土体取样和物理力学试验,对滑坡的成灾环境和机制进行研究,结果表明:(1)在云贵高原北缘垂直气候和微地貌影响下,在所谓的旱季(1月)局地仍有较丰沛的降水;(2)历史成因和所在层位决定下三叠统飞仙关组(T1f)崩坡堆积物是一套易饱水的高孔隙度易滑土层;(3)滑源高孔隙度土饱和流态化启动和滑动液化是灾害突然发生和远程运动的力学机制;(4)结合附近煤矿小规模开采、煤层深埋和滑坡发生时无瓦斯爆炸、无塌方的事实,可以排除地下采矿诱发滑坡的猜测。镇雄滑坡的成灾地质条件和滑动机制在我国西南山区具有一定的代表性,在今后的减灾、防灾工作中需要关注。On 11th of January,2013,a catastrophic landslide with an estimated volume of 250 000 m3 occurred in Zhenxiong County,Southwestern China. The geological surveying,the landslide mapping,the soil sampling and the laboratory tests were carried out afterwards to study the catastrophic causes and mechanisms of the landslide. It was found that there was an abundant precipitation even in the dry season of January due to the effects of the vertical climate and the micro geomorphology. The late Triassic colluvium of Feixianguan formation（T1f ） in the stratum of the slope was found to have a high porosity and to be easily saturated which was very likely prone to landsliding. The initiation of the fluidization of the saturated soil of high porosity and the liquefaction due to the movement were found to be the mechanisms of the sudden occurring and the long range movement of the landslide. The mining activity on the deeply buried coal seam over 300 m away from the landslide were excluded to be the cause of the landslide based on the facts that there were no mine disasters and no mine collapses when landslide occurred.

关 键 词：边坡工程 土质滑坡 土体流态化 土体液化 高孔隙度土 滑动机制 

分 类 号：P642[天文地球—工程地质学]