水土保持学报2013，Vol.27Issue(3)：59-62,4.
植被固土减蚀作用的力学效应
Mechanical Effects of Vegetation in Soil Conservation and Soil Erosion Reduction
摘要
Abstract
Soil shear strength on different vegetation-covered slope on the first and the second sub-regions and water-wind erosion crisscross region in hilly-gully region of loess plateau was analyzed to study the mechanical effects of vegetation on soil conservation and soil erosion reduction.The results showed that soil shear strength increased linearly with the increase of vertical stress on different vegetation-covered slope.Shear strength was proportional to the vertical pressure of shear surface,and it was in accord with Coulomb's law.Soil shear strength,soil cohesion force and internal friction angle on grass and shrub slope were significantly greater than those of the bare slope due to the role of vegetation on reinforcing soil.Soil cohesion force on grass and shrub slope was 1.04～ 2.11 times larger than that of the bare slope.Internal friction angle on grass and shrub slope was 1.03 ～ 1.19 times larger than that of the bare slope.Cohesive force had a significant negative correlation with sediment yield.The sediment yield showed a decreasing trend with the increase of soil cohesive force.The sediment yield increased with the increase of flow shear stress,and they had a good linear relationship.The relationship between the critical shear stress of runoff and soil shear strength and cohesion was established,which was helpful to study erosion process from mechanical mechanism.关键词
抗剪强度/黏聚力/侵蚀产沙量/力学效应/植被Key words
shear strength/ cohesion force/ sediment yield/ mechanical effects/ vegetation分类
农业科技引用本文复制引用
肖培青,姚文艺,刘希胜,申震洲..植被固土减蚀作用的力学效应[J].水土保持学报,2013,27(3):59-62,4.基金项目
国家自然科学基金项目(41071191) （41071191）
国家"十二五"科技支撑计划项目(2012BAB02B05) （2012BAB02B05）
中央级公益性科研院所基本科研业务费专项(HKY-JBYW-2012-04) （HKY-JBYW-2012-04）
水利部黄土高原水土流失过程与控制重点实验室开放课题资助项目(201306) （201306）
