Mechanical  Properties of Shrubs and Applicability of Model WU in Karst Area

ZHANG Qiao-yan; TANG Li-xia; PAN Lu; HUANG Tong-li; CHEN Long

doi:10.11988/ckyyb.20190480

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Journal of Changjiang River Scientific Research Institute ›› 2020, Vol. 37 ›› Issue (12) : 53-58. DOI: 10.11988/ckyyb.20190480

WATERSOIL CONSERVATION AND ECOCONSTRUCTION

Mechanical Properties of Shrubs and Applicability of Model WU in Karst Area

ZHANG Qiao-yan^1,2, TANG Li-xia¹, PAN Lu¹, HUANG Tong-li¹, CHEN Long¹

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Abstract

The mechanical properties(tensile and shear properties) of roots are pivotal factors affecting the soil and water conservation. The roots of Indigofera amblyantha Craib and Cassia bicapsularis Linn were selected to research the mechanics of slope protection in Karst area. The relationship between the roots’ tensile strength and the shear characteristics of soil-root composite was investigated through indoor tensile test on single root and direct shear test on soil-root composite. The applicability of model WU in Karst area was also analyzed. Results indicated that tensile strength declined overall with the increasing of root diameter; however, such trend differs corresponding to different plant types. The shear characteristic of soil-root composite was jointly affected by tensile strength and friction between soil and roots, of which the former had larger influence; the shear characteristic with thin root and thick root together was better. Modified model WU is applicable to Karst area; but the modification coefficient varies corresponding to different plants. The research findings would lay a good foundation for the ecological restoration and selection and allocation of tree species in Karst area.

Key words

root-soil composite / tensile strength / shear characteristics / model WU / Karst area

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ZHANG Qiao-yan, TANG Li-xia, PAN Lu, HUANG Tong-li, CHEN Long. Mechanical Properties of Shrubs and Applicability of Model WU in Karst Area[J]. Journal of Changjiang River Scientific Research Institute. 2020, 37(12): 53-58 https://doi.org/10.11988/ckyyb.20190480

References

[1] 王萍花,陈丽华,冀晓东,等.华北地区4种常见乔木根系抗拉强度的力学综合模型[J].北京林业大学学报,2012, 34(1):39-45.
[2] 朱锦奇,王云琦,王玉杰,等.基于植物生长过程的根系固土机制及Wu模型参数优化[J].林业科学,2018,54(4): 49-57.
[3] ANDREOLI A, BISCHETTI G B, CHIARADIA E, et al. The Roots of River Restoration: Role of Vegetation Recover in Bed Stabilization[C]//Proceedings of the 37th IAHR World Congress. Kuala Lumpur, Malaysia. August 13-18, 2017:243-252.
[4] 格日乐,张成福,蒙仲举,等.3种植物根-土复合体抗剪特性对比分析[J].水土保持学报,2014,28(2):85-90.
[5] ZHANG C B, CHEN L H, LIU Y P, et al. Triaxial Compression Test of Soil-Root Composites to Evaluate Influence of Roots on Soil Shear Strength[J]. Ecological Engineering, 2010, 36(1):19-26.
[6] 赵丹,余冬梅,胡夏嵩,等.盐生植物根系增强土体抗剪强度效应试验研究[J].水土保持研究,2017,24(4): 259-265,273.
[7] 朱锦奇,王云琦,王玉杰,等.基于试验与模型的根系增强抗剪强度分析[J].岩土力学,2014,35(2): 449-458.
[8] 胡文利,李为萍,陈军.不同含水率水平下根-土复合体抗剪强度试验研究[J].内蒙古农业大学学报(自然科学版), 2011,32(1):215-219.
[9] 栗岳洲,付江涛,余冬梅,等.寒旱环境盐生植物根系固土护坡力学效应及其最优含根量探讨[J].岩石力学与工程学报,2015,34(7):1370-1383.
[10]栗岳洲,付江涛,胡夏嵩,等.土体粒径对盐生植物根-土复合体抗剪强度影响的试验研究[J].岩石力学与工程学报,2016,35(2):403-412.
[11]邢会文,刘静,王林和,等.柠条、沙柳根与土及土与土界面摩擦特性[J].摩擦学学报,2010,30(1):87-91.
[12]张信宝,王世杰,白晓永,等.贵州石漠化空间分布与喀斯特地貌、岩性、降水和人口密度的关系[J].地球与环境, 2013,41(1): 1-6.
[13]POLLEN N,SIMON A. Estimating the Mechanical Effects of Riparian Vegetation on Stream Bank Stability Using a Fiber Bundle Model[J]. Water Resources Research, 2005, 41(7):226-244.
[14]WALDRON L J. The Shear Resistance of Root-Permeated Homogeneous and Stratified Soil[J]. Journal of the Soil Science Society of America, 1977, 41(5): 843-849.
[15]宋维峰,陈丽华,刘秀萍.林木根系与土体相互作用的有限元数值模拟中几个关键问题的探讨[J].水土保持研究, 2009,16(4): 6-13.
[16]鞠青娟.基于ANSYS建立的油松根土复合体有限元模型的验证[D].北京:北京林业大学, 2015.
[17]郭大立.植物根系:结构、功能及在生态系统物质循环中的地位[C]//第三届现代生态学讲座暨国际学术研讨会论文集.北京:国家自然科学基金委员会,2005:92-109.
[18]关超.红树林植物根系解剖结构研究[D].沈阳:沈阳农业大学, 2016.
[19]杨璞,向志海,胡夏嵩,等.根对土壤加强作用的研究[J].清华大学学报(自然科学版), 2009,49(2):305-308.
[20]WU T H, MCOMBER R M, ERB R T, et al. Study of Soil-Root Interaction[J].Journal of Geotechnical Engineering, 1988, 114(12): 1351-1375.
[21]夏振尧,刘琦,许文年,等.多花木蓝根系与土体界面摩阻特征[J].水土保持学报, 2018, 32(1): 128-134.
[22]赵玉娇,胡夏嵩,李华坦,等.寒旱环境灌木根系增强边坡土体抗剪强度特征[J].农业工程学报,2016,32(11): 174-180.
[23]GENET M,STOKES A,SALIN F,et al. The Influence of Cellulose Content on Tensile Strength in Tree Roots[J]. Plant and Soil, 2005, 278(1/2): 1-9.
[24]朱海丽,胡夏嵩,毛小青,等.护坡植物根系力学特性与其解剖结构关系[J].农业工程学报,2009,25(5):40-46.
[25]COMMANDEUR P R, PYLES M R. Modulus of Elasticity and Tensile Strength of Douglas-fir Roots[J]. Canadian Journal of Forest Research, 1991, 21(1):48-52.
[26]DOCKER B B, HUBBLE T C T. Quantifying Root-reinforcement of River Bank Soils by Four Australian Tree Species[J]. Geomorphology, 2008, 100(3): 401-418.