摘要
采用SDJ-1型三速电动直剪仪对重庆缙云山5种典型植被的原状土抗剪强度进行室内测定,得出其抗剪强度变化规律,通过运用灰色关联法对其影响因子和对5种典型植被进行分析,结果表明:所选取的影响因子对黏聚力C的影响大小依次为:干密度>小于0.001 mm黏粒含量>不均匀系数Cu>根密度>天然含水率>有机质含量;影响因子对内摩擦角φ的影响大小依次为:不均匀系数Cu>小于0.001 mm黏粒含量>天然含水率>干密度>有机质含量>根密度;5种典型植被对土壤抗剪强度影响最大为楠竹林,平权灰色关联度为0.851,最小为灌木林,平权灰色关联度为0.711,说明楠竹林土壤在自然条件下具有较大的抗剪强度。
The anti-shear strength of the undisturbed soil of five typical vegetations was tested in laboratory using the SDJ-1 instrument of direct shear,obtained the law of change of anti-shear strength. Grey relational analysis was used to study the influence factors on the anti-shear strength and five typical vegetations. The results indicate that the order of the effects of the influence factors on cohesion is dry density〉less than 0. 001 mm clay content〉coefficient of uniformity Cu〉root density〉natural water content〉organic content; The order of the effects of the influence factors on friction angle is coefficient of uniformity Cu less than 0. 001 mm clay content〉 natural water content〉dry density〉organic content〉root density ; Bamboo forest has the greateat effect on soil anti-shear strength in five typical vegetations,and the equal-weighted grey relation reading is 0. 851 ;Shrub forest has the smallest, and the equal-weighted grey relation reading is 0. 711;So the biggest anti-shear strength is shown for bamboo forest soil in natural condition.
出处
《水土保持研究》
CSCD
北大核心
2007年第2期145-147,151,共4页
Research of Soil and Water Conservation
基金
国家"十五"科技攻关课题"退耕还林工程区水源涵养型植被建设技术研究与示范"(2001BA510B02-01)
关键词
抗剪强度
黏聚力
灰色关联度
内摩擦角
anti-shear strength
cohesion
grey relation
friction angle
