宗全利,冯博,袁寄望,王建新,唐建

• 1:青岛农业大学资源与环境学院
• 2:石河子大学水利建筑工程学院
• 3:塔里木河流域干流管理局上游管理处

摘要(Abstract)：

为研究塔里木河干流上游岸坡荒漠植被根系对土体抗剪强度的增强作用,在初步分析流域植被覆盖现状基础上,对上游6个典型河岸进行了现场勘查,对骆驼刺(Alhagi sparsifolia.)、红柳(Tamarix ramosissima.)和芦苇(Phragmites australias.)三种典型植被覆盖的根-土复合体和无植被覆盖原状土体分别进行了12组和11组的对比取样,并进行了室内土工试验。试验结果表明:根-土复合体与原状素土相比平均黏聚力由8.04 kPa增加到16.86 kPa,增加了110%,平均内摩擦角由32.59°增加到33.76°,增加了3.6%。结合摩擦加筋原理,建立了植被根系增加土体抗剪强度的力学计算模型,通过模型计算了骆驼刺、红柳和芦苇三种植被不同根体积密度对应的根-土复合体抗剪强度,并与实测结果进行对比。结果表明:16组实测值中只有一组数据小于其相应的理论值范围(2.47<2.6 kPa),其余实测值全部大于理论计算最小值,充分说明建立的力学计算模型完全可以用于上述三种典型荒漠植被根系影响下的土体抗剪强度计算,为定量评价荒漠植被根系的固土能力提供一定的参考。

关键词(KeyWords)： 塔里木河;荒漠植被根系;根-土复合体;抗剪强度;根体积密度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51569029);; 青岛农业大学高层次人才科研基金(1119031)

作者(Author): 宗全利,冯博,袁寄望,王建新,唐建

DOI: 10.13928/j.cnki.wrahe.2019.10.023

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