薄叶山矾根系抗拔力的室内试验研究

doi:10.16843/j.sswc.2020.03.003

Abstract
Figure/Table
References
Related Citation (1)

Download: PDF (1352 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract [Background] Arbor and shrubs are common plants in vegetation slope protection in southern red clay, their roots are thicker and the roots grow deeper. Both the horizontal and vertical roots at the landslide zone act like anchors. Therefore, the interaction between roots of arbors and shrubs and deep soil is of great significance for slope ecological protection.[Methods] The experiment was carried out by controlling the geometric parameters of the root and the overlying load. The single root was buried horizontally in the center of the cube test box. The soil was laminated in two layers with a compactness of 90%. The upper part of the cube test box was used for loading. The reserved root was held by a modified HP-50 Handpi digital push-pull test device (the test tensile speed was controlled at 3 mm/s), and the pull-out device was connected to a computer to directly obtain the pull-out force data.[Results] 1) The maximum pull-out force of S. anomala roots increased with the increase of the root radius r, length L, and root-soil contact area; when the root appeared to be pulled out and damaged, the pull-out force per unit area of the root increased with the increase of the root radius r, and decreased with the increase of root length L. 2) In the presence of fibrous roots, the maximum pull-out force of the root increased from 48.2 N to 55.3 N, indicating that the presence of the fibrous roots increased the maximum pull-out force of the root. 3) The maximum pull-out force was 16.4 N when the load was 0 kPa; the maximum pull-out force was 22.2 N when the load was 3.125 kPa; and the maximum pull-out force was 26.9 N when the load was 6.250 kPa. This showed that the larger the overlying load was, the greater the increment of friction between the root and soil was. 4) By fitting and analyzing the experimental data, the friction angle decreased with the increase of L, r, and the root-soil contact area. The cohesive force decreased with the L increasing, while increased with r or the root-soil contact area increasing. The correlation between the root friction coefficient and the root-soil contact area was not significant.[Conculsions] Through the indoor pull-out test, the root-soil interaction forces of the S. anomala Brand root under different geometrical parameters, different overlying loads, and the presence or absence of fibrous roots are explored. The test results present certain regularity and provide an effective experimental basis for soil consolidation effect of slope protection by vegetation.

Key words： shrub root pull-out test geometric parameter root-soil interaction force

Received: 12 November 2019

PACS:	U416.14
	S157.5

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	ZHANG Wenhao
	WANG Guiyao
	HU Shenghui
	ZHANG Yongjie
	QUAN Peng
	CHANG Jingmei

Cite this article:

ZHANG Wenhao,WANG Guiyao,HU Shenghui, et al. Indoor experimental study on the pull-out force of Symplocos anomala Brand root[J]. SSWC, 2020, 18(3): 22-30.

URL:

http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2020.03.003 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2020/V18/I3/22

[1]	夏振尧,管世烽,牛鹏辉,等. 麦冬和多花木蓝根系抗拉拔特性试验研究[J]. 水土保持通报,2015,35(6):110. XIA Zhenyao, GUAN Shifeng, NIU Penghui, et al. Experimental study on pull-out properties of Ophiopogon japonicus and Rhododendron chinense roots[J]. Bulletin of Soil and Water Conservation, 2015, 35(6):110.
[2]	管世烽, 夏振尧,张伦,等. 水平荷载作用下多花木蓝根系拉拔试验研究[J]. 长江科学院院报,2016,33(6):24. GUAN Shifeng, XIA Zhenyao, ZHANG Lun, et al. Experimental study on the pullout of the multi-flowering blue roots under horizontal load[J]. Journal of Yangtze River Scientific Research Institute, 2016, 33(6):24.
[3]	陈丽华,余新晓,张东升,等. 整株林木垂向抗拉试验研究[J]. 资源科学,2004,26(7):39. CHEN Lihua, YU Xinxiao, ZHANG Dongsheng, et al. Vertical tensile test of whole plant trees[J]. Resources Science, 2004, 26(7):39.
[4]	刘小光. 林木根系与土壤摩擦锚固性能研究[D]. 北京:北京林业大学,2013:30. Liu Xiaoguang. Study on the frictional anchorage of forest roots and soil[D]. Beijing:Beijing Forestry University, 2013:30.
[5]	WALDRON L J,DAKESSIAN S. Soil reinforcement by roots:Calculation of increased soil shear resistance from root properties[J]. Soil Science, 1981, 132(6):427.
[6]	NORRIS J N. Root reinforcement by hawthorn and oak roots on a highway cut slope in southern England[J]. Plant Soil, 2005, 278(1/2):43.
[7]	刘亚斌,余冬梅,付江涛,等.黄土区灌木柠条锦鸡儿根-土间摩擦力学机制试验研究[J]. 农业工程学报,2017,33(10):198. LIU Yabin, YU Dongmei, FU Jiangtao, et al. Experimental study on mechanical mechanism of root-soil friction of Caragana korshinskii in the loess area[J]. Transactions of the CSAE, 2017, 33(10):198.
[8]	刘小光,赵红华,冀晓东等. 油松和落叶松根与土界面摩擦特性[J]. 摩擦学学报,2012,32(6):550. LIU Xiaoguang, ZHAO Honghua, YAN Xiaodong, et al. Friction characteristics of root-soil interface between Pinus tabulaeformis and larch[J]. Journal of Tribology, 2012, 32(6):550.
[9]	HAMZA O,BENGOUGH A G,BRANSBY M F, et al. Mechanics of root pullout from soil:A novel image and stress analysis procedure[M]//STOKES A, SPANOS I, NORRIS J E, et al. Eco- and ground bio-engineering:The use of vegetation to improve slope stability. Dordrecht,Netherlands:Springer,2007:213.
[10]	周云艳,陈建平,王晓梅等. 植被护坡中植物根系的阻裂增强机理研究[J].武汉大学学报(理学版),2009,55(5):613. ZHOU Yunyan, CHEN Jianping, WANG Xiaomei, et al. Study on the mechanism of blocking and strengthening of plant roots in vegetation slope protection[J]. Journal of Wuhan University(Science and Technology), 2009, 55(5):613.
[11]	黄承逵. 纤维混凝土结构[M].北京:机械工业出版社,2004:16. HUANG Chengwei. Fiber concrete structure[M]. Beijing:Mechanical Industry Press, 2004:16.
[12]	宋维峰,陈丽华,刘秀萍,等. 根系与土体接触面相互作用特性试验[J]. 中国水土保持科学,2006,4(2):62. SONG Weifeng, CHEN Lihua, LIU Xiuping, et al. Experimental study on interaction characteristics between root and soil contact surface[J]. Science of Soil and Water Conservation, 2006, 4(2):62.
[13]	曹云生,陈丽华,刘小光,等. 植物根土界面摩擦力的影响因素研究[J]. 摩擦学学报,2014,34(5):482 CAO Yunsheng, CHEN Lihua, LIU Xiaoguang, et al. Influencing factors of interfacial friction of plant roots and soils[J]. Journal of Tribology, 2014, 34(5):482.
[14]	王桂尧,胡圣辉,张永杰,等. 小乔木根系根土间作用力的室外拉拔试验研究[J]. 水文地质工程地质,2017,44(6):64. WANG Guiyao, HU Shenghui, ZHANG Yongjie, et al. Outdoor pull-out test of root-soil interaction between roots of small trees[J]. Hydrogeology and Engineering Geology, 2017, 44(6):64.
[15]	邢会文. 4种植物根-土界面摩阻特性研究[D]. 呼和浩特:内蒙古农业大学,2009:43. XING Huiwen. Study on friction characteristics of root-soil interface of 4 plants[D]. Hohhot:Inner Mongolia Agricultural University, 2009:43.
[16]	王可钧,李焯芬. 植物固坡的力学简析[J]. 岩石力学与工程学报,1998,17(6):687. WANG Kezhen, LI Yufen. A brief analysis of the mechanics of plant slope[J]. Chinese Journal of Rock Mechanics and Engineering, 1998, 17(6):687.