工程地质学报2017，Vol.25Issue(1)：1-10,10.DOI:10.13544/j.cnki.jeg.2017.01.001
寒旱环境草本与灌木植物单根拉伸试验强度特征研究
STRENGTH CHARACTERISTICS OF SINGLE ROOT TENSILE TEST OF HERBS AND SHRUBS IN COLD AND ARID ENVIRONMENTS
摘要
Abstract
This paper is to further explore the mechanical effects of plants in slope protection in cold and arid environments.It selects five kinds of native herbs and shrubs as the test samples.They are suitable for the local climate conditions.They are planted in the self-built test area in this research.The single tensile tests are carried out to systematically analyze the strength characteristics of plant roots of the five kinds of herbs and shrubs.The results show the follows.The single root tensile resistances increases with the diameter increasing.Power relations exist between single root tensile resistances and root diameters of the herbs and shrubs respectively.Meanwhile,the single root tensile strengths increase with the diameter decreasing.Power relations exist between single root tensile strengths and root diameters of five kinds of herbs and shrubs respectively.The single root tensile strength of Elymus nutans Griseb is bigger than that of Agropyron trachycaulum(Linn.)Gaertn,while the sequence of the single tensile strengths of shrubs from big to small is Caragana korshinskii Kom,Zygophyllum xanthoxylon (Bunge) Maxim.and Nitraria tangutorum Bobr.Besides,some phenomena are shown by comparing and analyzing the stress-strain relationship curves of tensile tests of three kinds of shrubs in the vegetative period of 1a and 2a.That is,in the early single root tensile test of shrubs,there is a linear relationship between stress and strain,which shows the elastic material properties.Until the middle and late stage of the test,the relationship between stress and strain is nonlinear and shows the elastic-plastic material properties.Further research shows a downward trend of the largest elongation of the shrub single root with the increasing of vegetative period.The results of the study have a theoretical researching and practical guiding significance in the prevention and treatment of geological disasters such as shallow landslide and soil erosion in the study area and in the protection of the regional ecological geological environment.关键词
寒旱环境/草本植物/灌木植物/拉伸试验/抗拉强度/生态护坡Key words
Cold and arid environments/Herbs/Shrubs/Tensile test/Tensile strength/Ecological slope protection分类
天文与地球科学引用本文复制引用
刘昌义,胡夏嵩,赵玉娇,窦增宁..寒旱环境草本与灌木植物单根拉伸试验强度特征研究[J].工程地质学报,2017,25(1):1-10,10.基金项目
国家自然科学基金项目(41162010,41572306),青海省自然科学基金项目(2014-ZJ-906),长安大学西部矿产资源与地质工程教育部重点实验室开放基金(CHD2011SY016)资助. （41162010,41572306）
