水土保持研究2018，Vol.25Issue(3)：23-28,6.
水蚀风蚀交错区黄土抗剪强度敏感性分析
Sensitivity on Shear Strength of the Loess in the Ecotone of Wind-Water Erosion
摘要
Abstract
The shear strength is not only an important mechanical index of the loess,but also a significant factor associated with gravity erosion.We carried out a series of quick direct shear tests on the remolded loess samples,and then evaluated the sensitivity on the shear strength of the dry density and moisture content using the increase-rate-analysis method.The experimental results reveal that the dry density could markedly affect the shear strength with changes in the cohesive force and internal friction angle,while the moisture content might markedly influence the shear strength with changes in the cohesive force.In addition,the influence of the moisture content on the internal friction angle was small,but that on the cohesive force was obvious.The cohesive force decreased with the increase of the moisture content at an exponential rate.On the other hand,the effect of the cohesive force on the water content was about 18.5 times higher than that on the internal friction angle.Moreover,the sensitivity parameter on the shear strength of the dry density was much larger than that of the moisture content,and the sensitivity of the former was 10 times that of the latter.The results can provide an insight into the mechanics mechanism and process of gravity erosion on the steep loess slope.关键词
抗剪强度/干密度/含水量/敏感性分析/重力侵蚀Key words
shear strength/dry density/moisture content/sensitivity analysis/gravity erosion分类
农业科技引用本文复制引用
郭文召,刘亚坤,徐向舟,唐小微,李涛,刘桢义,宋国栋..水蚀风蚀交错区黄土抗剪强度敏感性分析[J].水土保持研究,2018,25(3):23-28,6.基金项目
国家重点研发计划(2016YFC0402504) （2016YFC0402504）
国家自然科学基金项目(51479022) （51479022）
长江水利委员会长江科学院开放研究基金资助项目(CKWV2016388/KY) （CKWV2016388/KY）
