基于黏性材料的直根抗拔强度研究
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
研究表明,在用Abaqus模拟计算树根的抗拔强度时,土壤-树根的接触关系是一个非常重要的因素。针对土壤-树根的接触关系经常被假定为库仑摩擦模型,然而独立的库仑摩擦模型却不能很好地模拟树根的极限抗拔强度以及滑动开始之后的力学行为,基于Abaqus 6.10中的黏性材料对土壤-树根的接触关系进行模拟,在树根与土体之间加入了一层黏性材料,用以模拟树根周围的胶状土。直根拔出试验证实了黏性材料很好地弥补了库仑摩擦模型结果偏小的缺陷。分别对直根的长度-直径矩阵与直根体积固定矩阵进行了研究,得出了抗拔强度与接触面积有关的结论。
Researches show that the interaction between soil and root is a significant factor when stimulating and calculating the pull-out strength of root.Generally,the interaction between soil and root is assumed to be Columb-friction model.However,the simulation results obtained by solo Columb-friction model are not optimistic for pull-out strength of root and the mechanical behavior after slide begins.In this study,the model based on cohesive material of Abaqus 6.10 is applied to stimulate the relationship between soil and root.Adding a layer of cohesive material between soil and root is used to simulate colloidal soil around the root.After conducting several tap-root pull-out tests,it is confirmed that the cohesive material can diminish the drawbacks of Columb-friction model.Diameter-length matrix and volume-fixed matrix of tap-root are studied,which shows that the pullout strength of tap-root is related to the total contact area between soil and the tap-root.
引文
[1]CAMPBELL S D,DIAS A.The Use of Soil Bioengineering Measures to Repair Selected Natural Terrain Landslides in Hong Kong(25th Annual Seminar)[M].Hong Kong:The HKIE Geotechnical Division,2005.
    [2]TIEN H W,MCOMBER R M,RONALD T E,et al.Study of soil-root interaction[J].Geotech Eng,1988,114(12):1351-1375.
    [3]SCHWARZ M,COHEN D,OR D.Root-soil mechanical interactions during pull out and failure of root bundles[J].Journal of Geophysical Research:Earth Surface,2010,115:403-407.
    [4]The 3DExperience Company.ABAQUS Analysis User’s Manual[M].[S.l.]:[s.n.],2011.
    [5]GUO Xiaoxiao.Pull-out strength of root-geological engineering and mining exploration in central Asia[A].The XVⅢKerulien International Conference on Geology[C].Aussino:Academic Publishing House,2013:152-170.
    [6]DUPUY L,FOURCAUD T,STOKES A.A numerical investigation into factors affecting the anchorage of roots in tension[J].European Journal of Soil Science,2005,56(3):319-327.
    [7]DUPUY L,FOURCAUD T,STOKES A.A numerical investigation into the influence of soil type and root architecture on tree anchorage[J].Plant and Soil,2005,278(1/2):119-134.
    [8]SCHWARZ M,COHEN D,OR D.Pullout tests of root analogs and natural root bundles in soil:Experiments and modeling[J].Journal of Geophysical Research:Earth Surface,2011,116:175-177.
    [9]孔令伟,陈正汉.特殊土与边坡技术发展综述[J].土木工程学报,2012,45(5):141-161.KONG Lingwei,CHEN Zhenghan.Advancement in the techniques for special soils and slopes[J].China Civil Engineering Journal,2012,45(5):141-161.
    [10]王兰民.黄土动力学[M].北京:地震出版社,2003.WANG Lanmin.Loess Dynamics[M].Beijing:Earthquake Press,2003.
    [11]郑宏.严格三维极限平衡法[J].岩石力学与工程学报,2007,26(8):1529-1537.ZHENG Hong.A rigorous three-dimensional limit equilibrium method[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(8):1529-1537.
    [12]ZHENG Yingren,TANG Xiaosong,ZHAO Shangyi,et al.Strength reduction and step-loading finite element approaches in geotechnical engineering[J].Journal of Rock Mechanics and Geotechnical Engineering,2009,1(1):21-30.
    [13]彭玉青,张红梅,何华,等.数据挖掘技术及其在教学中的应用[J].河北科技大学学报,2001,22(4):21-24.PENG Yuqing,ZHANG Hongmei,HE Hua,et al.Data mining technology and its application in teaching[J].Journal of Hebei University of Science and Technology,2001,22(4):21-24.
    [14]言志信,宋杰,蔡汉成,等.草本植物加固边坡的力学原理[J].土木建筑与环境工程,2010,32(2):30-34.YAN Zhixin,SONG Jie,CAI Hancheng,et al.Mechanical analysis of herbaceous plant strengthening slope[J].Journal of Civil,Architectural&Environmental Engineering,2010,32(2):30-34.
    [15]侍倩.植被对斜坡土体土力学参数影响的试验研究[J].岩土力学,2005,26(12):2027-2030.SHI Qian.Test research on influence of vegetation on mechanical parameters of soils[J].Rock and Soil Mechanics,2005,26(12):2027-2030.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心