基于降雨入渗深度反演的某黄土滑坡机理研究  

Analysis of loess landslide mechanism based on depth identification of rainfall infiltration

作　　者：郭抗美[1,2] 王超[2] 纪洪广[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]河北工业大学土木学院,天津300132

出　　处：《湖南科技大学学报（自然科学版）》2009年第3期56-60,共5页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：河北省自然科学基金资助项目(E2008000075)

摘　　要：黄土滑坡是我国西北地区常见的地质灾害,且滑动突然,规模巨大.针对黄土滑坡特点,在探讨滑坡滑动机理时,提出根据降雨入渗深度为界限,上部土体采用饱和土体的相应计算参数,下部土体采用天然土体的相应计算参数分段赋值的新思路.应用上述思路,在对甘肃某黄土滑坡现场勘察、确定利用遗传算法反演边坡稳定分析的重要参数——降雨入渗深度的基础上,结合数值分析软件FLAC2D和FLAC/SLOPE对该滑坡进行了详细分析.结果表明遗传算法反演岩土力学参数是可行的;该滑坡滑动时的降雨入渗深度为5.3m;滑动机理为降雨入渗导致黄土坡体上部推动下部滑动的推移式滑坡.图5,表1,参12.The loess landslide is a common geology disaster in northwest China. The loess landslide usually glides all in a sudden and its scale is huge. When analyzing the mechanism of landslide, in view of the characteristic of loess landslide, a new method is advanced, which is according to the depth division of rainfall infiltration, the upper soil body was evaluated by the saturated soil corresponding computation parameter, the lower part the natural soil corresponding computation parameter. On the foundation of the investigation of certain loess landslide in Gansu province and the determination of the genetic algorithm parameter identification was adopted to get the depth of rainfall infiltration, this new method, together with numerical analysis soft-wares FLAC2D and FLAC/SLOPE were applied to analyze the landslide. The result indicates that the genetic algorithm parameter identification in soil and rock is workable; the depth of rainfall infiltration when landslide occurring is 5.3 meters; the mechanism of the loess landslide is a rainfall infiltration caused landslide where the upper soil body pushes the lower soil body. 5figs., ltab., 12refs.

关 键 词：黄土滑坡 降雨入渗深度 遗传算法 参数反演 机理 

分 类 号：U416.1[交通运输工程—道路与铁道工程]