寒旱环境灌木植物根-土相互作用及其护坡力学效应
RESEARCH ON INTERACTION BETWEEN VEGETATION ROOT AND SOIL FOR SLOPE PROTECTION AND ITS MECHANICAL EFFECT IN COLD AND ARID ENVIRONMENTS
查看参考文献20篇
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文摘
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通过在试验区将4种护坡灌木植物种植在PVC管内,分别对土体、4种灌木根-土复合体试样做直接剪切试验,对比非含根土体与4种灌木含根系土体抗剪强度指标,评价试验区生长时间为1a灌木根系的护坡力学效应;通过对比4种灌木根-土复合体抗剪强度,评价生长时间为1a的4种灌木根-土复合体的护坡力学强度增强效应.试验结果表明:(1)4种灌木根-土复合体当其含根量、含水量一定时,抗剪强度随垂直压力的增大而呈线性增大,表明试验区灌木根-土复合体抗剪强度与剪切面上的法向压力成正比,且符合库仑定律;(2)4种灌木根-土复合体的黏聚力显著大于素土的黏聚力,而内摩擦角φ的变化不显著;(3)四翅滨藜、柠条锦鸡儿、霸王、白刺灌木根-土复合体的黏聚力与素土相比,其增长幅度分别是76.3%,62.7%,45.8%,22.0%.试验区灌木根-土复合体剪应力与剪切位移关系反映出灌木根-土复合体受剪力作用开始段近似线性,接近剪破时呈圆滑曲线,达到剪破后近似为水平线,灌木根-土复合体剪应力随着垂直压力的增大而呈显著增加趋势;剪应力的增大开始阶段基本呈线性,接近剪破时呈非线性.根据试验区4种灌木植物根-土复合体强度,它们的护坡贡献按由大至小分别是:四翅滨藜、柠条锦鸡儿、霸王、白刺. |
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其他语种文摘
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Four shrubs planted in PVC pipes in the testing areas are studied; then direct shear tests on the undisturbed soil and root-soil composite system are conducted. By comparing the shear strength indexes of the soil without root and four kinds of soils with roots, the mechanical effects of the root system of four shrubs with one-year growth period on slope protection can be evaluated. Comparison between the shear strengths of four-shrub root-soil composite systems is made to evaluate the enhancement effect of the systems for slope protection. The results show that: (1) when the root and water contents of the four-shrub root-soil composite systems keep constant, the shear strength increases linearly with increasing vertical pressure, indicating that the direct shear strength of the root-soil composite systems agrees with Coulomb law; (2) the cohesion of the root-soil composite systems is obviously larger than that of soil without roots, and there are no apparent changes in the internal friction angle; (3) compared with the cohesion of soil without roots, the increasing amplitudes of the cohesion of Atriplex canescens, Caraganakorshinskii, Zygophyllum xanthoxylon, Nitraria tangutorum are 76.3%, 62.7%, 45.8% and 22.0% respectively. The relations between the shear strength and displacement of the root-soil composite systems show a linear relationship at the beginning stage of the shear process, a rounding curved relationship at the end of the shear process, and an approximate horizontal relationship when shear failure. The shear stress of the root-soil composite systems increases obviously with increasing vertical pressure, in which the increasing rule of shearing strength agrees with linear relationship at the beginning of the shearing process, basically linear at the beginning and nonlinear when approaching failure. According to the strengths of the four-shrub root-soil composite systems, the mechanical effects of the four one-year growth period shrubs for slope protection are as follows: Atriplex canescens >Caragana korshinskii> Zygophyllum xanthoxylon > Nitraria tangutorum. |
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来源
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岩石力学与工程学报
,2009,28(3):613-620 【核心库】
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关键词
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土力学
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寒旱环境
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灌木植物
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根-土相互作用
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根-土复合体
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力学效应
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植物护坡
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地址
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1.
中国科学院 西北高原生物研究所, 青海, 西宁, 810008
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青海大学, 青海, 西宁, 810016
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中国科学院西北高原生物研究所, 青海, 西宁, 810008
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-6915 |
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学科
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建筑科学 |
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基金
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国家自然科学基金
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中国博士后科学基金
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国家教育部新世纪优秀人才支持计划
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文献收藏号
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CSCD:3626087
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参考文献 共
20
共1页
|
|
1.
周德培.
植被护坡工程技术,2003
|
被引
97
次
|
|
|
|
|
2.
杨永红. 不同植被类型根系提高浅层滑坡土体抗剪强度的试验研究.
水土保持研究,2007,14(2):233-235
|
被引
30
次
|
|
|
|
|
3.
戚国庆. 植被护坡机制及应用研究.
岩石力学与工程学报,2006,25(11):2220-2225
|
被引
27
次
|
|
|
|
|
4.
王可钧. 植物固坡的力学简析.
岩石力学与工程学报,1998,17(61):687-691
|
被引
58
次
|
|
|
|
|
5.
OPERSTEIN V. The influence of vegetation on soil strength.
Ground Improvement,2000,4(2):81-89
|
被引
56
次
|
|
|
|
|
6.
NILAWEERA N S. Role of tree roots in slope stabilisation.
Bulletin of Engineering Geology and the Environment,1999,57:337-342
|
被引
44
次
|
|
|
|
|
7.
EKANAYAKE J C. A method for stability analysis of vegetated hillslopes:an energy approach.
Canadian Geotechnical Journal,1999,36(6):1172-1184
|
被引
12
次
|
|
|
|
|
8.
李绍才. 护坡植物根系与岩体相互作用的力学特性.
岩石力学与工程学报,2006,25(10):2051-2057
|
被引
49
次
|
|
|
|
|
9.
李国荣. 浅析灌木与草本植物护坡效应.
草业科学,2007,24(6):86-89
|
被引
26
次
|
|
|
|
|
10.
赵志明. 工程边坡绿色防护机制研究.
岩石力学与工程学报,2006,25(2):299-305
|
被引
6
次
|
|
|
|
|
11.
肖盛燮. 边坡防护工程中植物根系的加固机制与能力分析.
岩石力学与工程学报,2006,25(增1):2670-2674
|
被引
18
次
|
|
|
|
|
12.
朱海丽. 植被护坡研究进展与展望.
中国水土保持,2007(4):26-29
|
被引
9
次
|
|
|
|
|
13.
周跃. 云南松侧根对浅层土体的水平牵引效应的初步研究.
植物生态学报,1999,23(5):458-465
|
被引
12
次
|
|
|
|
|
14.
程洪. 草本植物根系网的固土机制模式与力学试验研究.
水土保持研究,2006,13(1):62-65
|
被引
38
次
|
|
|
|
|
15.
邓卫东. 植物根系固坡作用的试验与计算.
中国公路学报,2007,20(5):7-12
|
被引
11
次
|
|
|
|
|
16.
赵丽兵. 草本植物根系增强土壤抗剪切强度的量化研究.
中国生态农业学报,2008,16(3):718-722
|
被引
30
次
|
|
|
|
|
17.
杨亚川. 土壤-草本植被根系复合体抗水蚀强度与抗剪强度的试验研究.
中国农业大学学报,1996,1(2):31-38
|
被引
70
次
|
|
|
|
|
18.
任永胜. 西宁市地质灾害及其防治对策.
青海国土经略,2004(3):31-33
|
被引
4
次
|
|
|
|
|
19.
宋维峰. 根系与土体接触面相互作用特性试验.
中国水土保持科学,2006,4(2):62-65
|
被引
31
次
|
|
|
|
|
20.
李绍才. 坡面岩体-基质-根系互作的力学特性.
岩石力学与工程学报,2005,24(12):2074-2081
|
被引
30
次
|
|
|
|
|
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