文献类型：期刊文献

中文题名：快剪条件下柠条根对3种土壤土工特性的影响

英文题名：Effect of Caragana microphylla Roots on Geotechnical Properties of Three Soil Types Under Fast Shear Condition

作者：胡宁[1] 刘静[1] 姚喜军[1] 苑淑娟[2] 周丹丹[3] 张格[4]

第一作者：胡宁

机构：[1]内蒙古农业大学生态环境学院;[2]内蒙古自治区灌溉排水发展中心;[3]兴安盟水利工程质量监督站;[4]中国林业科学研究院沙漠林业实验中心

年份：2014

卷号：28

期号：1

起止页码：106-111

中文期刊名：水土保持学报

外文期刊名：Journal of Soil and Water Conservation

收录：CSTPCD;;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：国家自然基金项目"风水复合侵蚀区(采煤塌陷区)植物枝叶根系耦合抗蚀的生物力学机理研究"(51064021);内蒙基金重点项目"植物枝叶根系固土抗蚀的生物力学特性研究"(2010ZD16)

语种：中文

中文关键词：根-土复合体;抗剪强度;残余强度;快剪条件;柠条

外文关键词：root-soil composite; shear strength; residual strength; fast shear condition; Caragana microphylla

分类号：S157.2

摘要：针对内蒙古中部地区3种主要土壤类型（含细粒土砂、低液限粉土、低液限粘土）和3年生的典型水土保持植物种柠条（Caragana microphylla Lam．），采用室内直剪的快剪实验对3种土壤根-土复合体在土壤孔隙水承压时的土工特性（抗剪特性及残余特性）进行研究。结果为：在根系分布的浅层土（埋深1．5m），3种土壤根-土复合体的抗剪强度、残余强度均大于相应素土的强度值，且均随土壤中细粒（粒径〈0．075mm）含量的增加而增大，表现为低液限粘土根-土复合体（细粒含量为71．68％）〉低液限粉土根-土复合体（细粒含量为56．58％）〉含细粒土砂根-土复合体（细粒含量为30．56％）；3种土壤根-土复合体的黏聚力与残余黏聚力值也符合上述规律，内摩擦角与残余内摩擦角值与相应素土相比无明显规律，但随土壤中细粒含量的增加而减少。柠条根提高3种土壤残余强度的增长率（5．77％～15．67％）要大于提高土壤抗剪强度的增长率（5．62％～13．21％），这与根的弹塑性变形特性及根-土界面间的摩阻特性有关。柠条根提高土体土工特性的有效性随土体埋深的增加而减弱。
There were 3 kinds of soil types（fine-grained sand, low liquid limit silt and low liquid limit clay） that lied on the central region of Inner Mongolia and three-year-old Caragana microphylla Lam. （the typical plant could conserve soil and water） were choose to study the relationship on the shear and residual characteristics of 3 kinds of root-soil composite. The test used the fast direct shear test way in laboratory. The result showed that： In the shallow layer with soil（1.5 m depth）, both shear strength and residual strength of 3 kinds of root-soil composite was greater than the corresponding value of plain soil strength, as the fine（grain size less than 0.075 mm） in the soil increased in proportion, the shear and residual characteristics of 3 kinds of root-soil composite increased, the order was： Root-soil complex of low liquid limit clay（fines content was 71. 68%） ）low liquid limit silt（56. 58%） ）fine-grain soil sand（30.56%）. For the root-soil composite, the cohesive force and residual cohesive force were also in line with the above law, but internal friction angle and residual internal friction angle values without obvious law （compared with the corresponding plain soil）, and decreased with increasing fines content in the soil. The increase of Caragana microphylla root raising 3 kinds of soil residual strength of growth（5.77%-15.67%） was higher than shear strength of growth（5. 62%- 13. 21%）. It was relevant to the elastic-plastic deformation properties of the root and the root-soil interface friction characteristics. As increasing soil depth, validity of the geotechnical characteristics of Caragana microphylla root for improving soil weakened.