YU Dongmei,QI Zhaoxin,LIU Yabin,et al.Factors Affecting Shear Strength and Contribution Evaluation of Root-Soil Composite Systems of Five Halophytes in the Salt Lake Region of Northwest Qaidam Basin, Qinghai Province[J].Research of Soil and Water Conservation,2019,26(04):157-165.
青海柴达木盆地盐湖区5种盐生植物根-土复合体抗剪强度影响因素及评价
- Title:
- Factors Affecting Shear Strength and Contribution Evaluation of Root-Soil Composite Systems of Five Halophytes in the Salt Lake Region of Northwest Qaidam Basin, Qinghai Province
- 分类号:
- S152;S153
- 摘要:
- 为探讨高寒干旱环境下盐生植物根—土复合体抗剪强度影响因素以及复合体抗剪强度特征，选取了位于柴达木盆地西北部的尕斯库勒盐湖区作为研究区，筛选出芦苇、海韭菜、无脉苔草、赖草和洽草5种优势盐生植物作为试验供试种，对其进行了室内根—土复合体原状试样直剪试验，分析了复合体容重、含水量、根长密度（RLD）、根重密度（RWD）和根面积比（RAR）5种因素对根—土复合体抗剪强度影响；在此基础上，采用灰色关联法进一步评价了上述5种因素对复合体抗剪强度的影响程度，结果表明：盐生植物根—土复合体粘聚力c值、摩擦角φ值与影响因素间的灰色关联度容重为0.740，0.879，含水量为0.698，0.849，根重密度为0.692，0.609，根长密度为0.655，0.519，根面积比为0.631，0.569；5种盐生植物根—土复合体粘聚力c值与5种影响因素容重之间的关系相对较为显著。其中芦苇根系增强土体粘聚力c值作用相对较为显著，其根系在土体中呈近似垂直状分布，故在试样中根系多数穿过剪切面，即当复合体发生剪切变形时，试样中根系基本均能起到抵抗剪切变形作用。该研究成果对研究区及其周边地区有效防治坡面水土流失、浅层滑坡等地质灾害现象发生具有一定理论研究价值和实际指导意义。
- Abstract:
- To explore the factors which affect shear strength of five halophyte root-soil composite systems and the characteristics of shear strength, the region around the Gasikule Salt in Qiadam Basin was selected as the test site. First, five predominate indigenous plant species such as Phragmites australis Trin., Triglochin maritimum Linn., Carex enervis C. A. Mey., Leymus secalinus (Georgi) Tzvel., Koeleria cristata (L.) Pers. were taken as test plants; then indoor direct shear tests were conducted on the rooted soil of the five species to investigate the effects of such factors as Bulk density, moisture content, root length density, root weight density, and root area ratio on the shear strength of rooted soil; finally, based on the above tests, grey correlation method was adopted to further evaluate the degrees of the effects of these factors on the shear strength of rooted soil. The results have testified the grey correlations of cohesion force (c) and internal friction angel (φ) with the factors, that is, the correlation of bulk density to c and φ is 0.740 and 0.879, 0.698 and 0.849 for moisture content, 0.692 and 0.609 for root weight density, 0.655 and 0.519 for root length density, 0.631 and 0.569 for root area ratio; among the five factors, there is a significant correlation between bulk density and shear strength of rooted soil for the five species. Phragmites australis root enhancing soil cohesion c value is relatively significant because the root system is approximately vertical in the soil. Therefore, most of the roots in the sample pass through the shear plane, that is, when the composite shear deformation occurs, the root system in the sample can basically play a role in resisting shear deformation. The results can be significance of preventing water and soil loss and controlling shallow landslides and other natural disasters in the areas with similar geological and climatic conditions.
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备注/Memo
收稿日期:2018-10-15;改回日期:2018-11-20。
基金项目:国家自然科学基金（41572306）；中国科学院“百人计划”（Y110091025）；青海省自然科学基金（2014-ZJ-906）
作者简介:余冬梅(1986-),女,河南信阳人,硕士生,助理研究员,主要从事地质灾害防治以及环境生态研究。E-mail:ydm2011@isl.ac.cn
通讯作者:胡夏嵩(1965-),男,河南开封人,教授,主要从事环境岩土工程与地质工程等的教学与研究工作。E-mail:huxiasong@tsinghua.org.cn