灾害学2017，Vol.32Issue(4)：60-66,7.DOI:10.3969/j.issn.1000-811X.2017.04.010
灌溉诱发的黑方台黄土滑坡泥流机理分析
Analysis of a Flow-slide in Heifangtai Induced by Irrigation
摘要
Abstract
For a loess flow slide in Heifangtai Gansu Province,field investigation for the geological structure,laboratory tests including basic physical parameters tests,traixial tests,SWCC tests,and finite seep and elasticplastic numerical model are conducted to study the failure mechanism.The changing characters of groundwater table and the related slope stability are analyzed.The yield characteristics associated by comparing the shear stress and shear strength along the slide surface are studied by extracting the stress state along the failure surface.Results show that the flow-slide is a loess landslide,whose failure surface lies in the loess layer.The saturated water content of loess is higher than its liquid limit,meaning the loess is easy to liquefy when it is disturbed;the silt clay below the loess layer has a low saturated permeability and high water storage capacity,making it easy to form a water table above it.Under the irrigation conditions,the ground water table increases slowly,the factor of safety of the slope fluctuates at first and begin to decrease greatly when the groundwater table researches the slide surface.Before irrigation,the shear strength is higher than the shear strength along the slide surface.With the irrigation continuing,the slope toe yields first,and the yield area expands upwards.The following stress redistribution leads to the yield of soil at the crest of slope.At the end the whole soil along the slide surface yields with the stress researches the shear strength.The landslide is a retrogressive landslide.关键词
黄土滑坡/泥流/野外测量/室内试验/有限元模型/牵引式滑坡/甘肃黑方台Key words
loess flow-slide/field investigation/laboratory tests/finite numerical model/retrogressive landslide分类
资源环境引用本文复制引用
赵纪飞,黄嘉悦,侯晓坤,李同录,蔺晓燕..灌溉诱发的黑方台黄土滑坡泥流机理分析[J].灾害学,2017,32(4):60-66,7.基金项目
国家自然科学基金项目(40772181,41372329) （40772181,41372329）
国家重点基础研究发展计划(973计划)资助项目(2014CB744701) （973计划）
