|
|
|
| PRELIMINARY STUDY OF RELATIONSHIP BETWEEN SHALLOW SOIL REINFORCEMENT AND FRACTAL CHARACTERISTICS OF VEGETATION ROOTS IN BIOTECHNICAL SLOPE PROTECTION |
| XIA Zhenyao1，2，ZHOU Zhengjun2，HUANG Xiaole2，XU Wennian1，2 |
(1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education，China Three Gorges University，Yichang，Hubei 443002，China；2. College of Civil Engineering and Architecture，China Three Gorges University，
Yichang，Hubei 443002，China) |
|
|
|
|
Abstract In biotechnical slope protection engineering，the spatial distribution of plant roots exerts an important impact on the strength of root-soil reinforced composite. Two common plants，i.e. medicago sativa and cynodon dactylon，were planted in containers. Till the roots penetrating the whole soil (referring to base material of vegetation-growing concrete)，direct shear tests along the soil depth on the undisturbed soil and root-soil composite system are conducted respectively，and the fractal characteristics of roots are analyzed. The relationship between cohesive strength added value and the fractal characteristics of vegetation roots is to be studied by contrast. The results show that：(1) The shear strength of soil increases evidently after roots distributing in soil，especially the added value of cohesive strength increases obviously，but the increasing amplitudes of medicago sativa and cynodon dactylon manifest very significant difference. (2) The roots of the two plants both have fractal structure，the more biomass and well-distributed of roots in soil，the fractal dimension is comparatively larger. (3) The cohesive strength added value of soil is significantly positively correlated with the fractal dimension of the vegetation roots.
|
|
Received: 18 June 2010
|
|
|
|
| [1] 孔东莲，郭小平，赵廷宁. 植被护坡技术的研究[J]. 水土保持研究，2007，14(1)：69–71.(KONG Donglian，GUO Xiaoping，ZHAO Tingning. Study on slope vegetation[J]. Research of Soil and Water Conservation，2007，14(1)：69–71.(in Chinese))
[2] 陈昌富，刘怀星，李亚平. 草根加筋土的室内三轴试验研究[J]. 岩土力学，2007，28(10)：2 041–2 045.(CHEN Changfu，LIU Huaixing，LI Yaping. Study on grassroots-reinforced soil by laboratory triaxial test[J]. Rock and Soil Mechanics，2007，28(10)：2 041–2 045.(in Chinese))
[3] 程 洪，颜传盛，李建庆，等. 草本植物根系网的固土机制模式与力学试验研究[J]. 水土保持研究，2006，13(1)：62–65.(CHENG Hong，YAN Chuansheng，LI Jianqing，et al. An experimental study on mechanic performance and mechanism of soil-reinforcement by herb root system[J]. Research of Soil and Water Conservation，2006，13(1)：62–65.(in Chinese))
[4] 陈昌富，刘怀星，李亚平. 草根加筋土的护坡机制及强度准则试验研究[J]. 中南公路工程，2006，31(2)：14–17.(CHEN Changfu，LIU Huaixing，LI Yaping. Experiment investigation on reinforcement mechanism and strength criterion of grassroots reinforced soils[J]. Central South Highway Engineering，2006，31(2)：14–17.(in Chinese))
[5] 徐则民，黄润秋，唐正光，等. 植被护坡的局限性及其对深层滑坡孕育的贡献[J]. 岩石力学与工程学报，2005，24(3)：438–450.(XU Zeming，HUAN Runqiu，TANG Zhengguang，et al. Limitations of biotechnical slope protection and contribution of vegetation to deep seated landslide preparation[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(3)：438–450.(in Chinese))
[6] 杨亚川，莫永京，王之芳，等. 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[J]. 中国农业大学学报，1996，1(2)：31–38.(YANG Yachuan，MO Yongjing，WANG Zhifang，et al. Experimental study on anti-water erosion and shear strength of soil-root composite[J]. Journal of China Agricultural University，1996，1(2)：31–38.(in Chinese))
[7] OPERSTEIN V，FRYDMAN S. The influence of vegetation on soil strength[J]. Ground Improvement，2000，4(2)：81–89.
[8] EKANAYAKE J C，PHILIPS C J. A method for stability analysis of vegetated hillslopes：an energy approach[J]. Canadian Geotechnical Journal，2000，36(6)：1 172–1 184.
[9] NILAWEERA N S，NUTALAYA P. Role of tree roots in slope stabilization[J]. Bulletin of Engineering Geology and the Environment，1999，57(4)：337–342.
[10] 赵志明，吴 光，王喜华. 工程边坡绿色防护机制研究[J]. 岩石力学与工程学报，2006，25(2)：299–305.(ZHAO Zhiming，WU Guang，WANG Xihua. Research on greening protection mechanism for engineering slope[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(2)：299–305.(in Chinese))
[11] 肖盛燮，周 辉，凌天清. 边坡防护工程中植物根系的加固机制与能力分析[J]. 岩石力学与工程学报，2006，25(增1)：2 670–2 674. (XIAO Shengxie，ZHOU Hui，LING Tianqing. Mechanism and ability analysis of plant root reinforcement in slope protection[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(Supp.1)：2 670–2 674.(in Chinese))
[12] 李国荣，毛小青，倪三川，等. 浅析灌木与草本植物护坡效应[J]. 草业科学，2007，24(6)：86–89.(LI Guorong，MAO Xiaoqing，NI Sanchuan，et al. Brief analysis of the effect of slope protection by shrub-grass vegetation[J]. Pratacultural Science，2007，24(6)：86–89.(in Chinese))
[13] 胡夏嵩，李国荣，朱海丽，等. 寒旱环境灌木植物根–土相互作用及其护坡力学效应[J]. 岩石力学与工程学报，2009，28(3)：613–620.(HU Xiasong，LI Guorong，ZHU Haili，et al. Research on interaction between vegetation root and soil for slope protection and its mechanical effect in cold and arid environments[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(3)：613–620.(in Chinese))
[14] 吴景海，王德群，陈 环. 土工合成材料加筋砂土三轴试验研究[J]. 岩土工程学报，2000，22(2)：199–204.(WU Jinghai，WANG Dequn，CHEN Huan. Study on geosynthetic reinforced sand by triaxial compression test[J]. Chinese Journal of Geotechnical Engineering，2000，22(2)：199–204.(in Chinese))
[15] 杨果林，王永和. 钢筋(煤矸石)混凝土网格式加筋土挡土结构强度特性与试验研究[J]. 岩土工程学报，1999，21(5)：534–539.(YANG Guolin，WANG Yonghe. Strength property of RC net reinforced earth retaining structure and its experimental study[J]. Chinese Journal of Geotechnical Engineering，1999，21(5)：534–539.(in Chinese))
[16] GRAY D H，Al-REFEAI T. Behavior of fabric vs. fiber-reinforced sand[J]. Journal of the Geotechnical Engineering. ASCE，1986，112(8)：804–820.
[17] 赵丽兵，张宝贵，苏志珠. 草本植物根系增强土壤抗剪切强度的量化研究[J]. 中国生态农业学报，2008，16(3)：718–722.(ZHAO Libin，ZHANG Baogui，SU Zhizhu. Quantitative analysis of soil anti-shearing strength enhancement by the root systems of herb plants[J]. Chinese Journal of Eco-Agriculture，2008，16(3)：718–722. (in Chinese))
[18] 邓卫东，周群华，严秋荣. 植物根系固坡作用的试验与计算[J]. 中国公路学报，2007，20(5)：7–12.(DENG Weidong，ZHOU Qunhua，YAN Qiurong. Test and calculation of effect of plant root on slope consolidation[J]. China Journal of Highway and Transport，2007，20(5)：7–12.(in Chinese))
[19] 周德培，张俊云. 植被护坡工程技术[M]. 北京：人民交通出版社，2003：66–69.(ZHOU Depei，ZHANG Junyun. Bio-geotechnical technology of vegetation[M]. Beijing：China Communications Press，
2003：66–69.(in Chinese))
[20] FALCONER K. 分形几何：数学基础及其应用[M]. 2版. 曾文曲译. 北京：人民邮电出版社，2007：8–9.(FALCONER K. Fractal geometry：mathematical foundations and applications[M]. 2nd ed. Translated by ZENG Wenqu. Beijing：People?s Posts and Telecom Press，2007：8–9.(in Chinese))
[21] 王义琴，张慧娟，白克勇，等. 分形几何在植物根系研究中的应用[J]. 自然杂志，1999，21(3)：143–146.(WANG Yiqin，ZHANG Huijuan，BAI Keyong，et al. Application of fractal geometry in the studies of plant root systems[J]. Nature Magazine，1999，21(3)：143–146.(in Chinese))
[22] 廖成章，余翔华. 分形理论在植物根系结构研究中的应用[J]. 江西农业大学学报，2001，23(2)：192–196.(LIAO Chengzhang，YU Xianghua. Application of fractal theory on studies of the root structure of plant[J]. Acta Agriculturae Universitatis Jiangxiensis，2001，23(2)：192–196.(in Chinese))
[23] 李火根，黄敏仁. 分形及其在植物研究中的应用[J]. 植物学通报，2001，18(6)：684–690.(LI Huogen，HUANG Minren. Fractal theory and its application to plants researches[J]. Chinese Bulletin of Botany，2001，18(6)：684–690.(in Chinese))
[24] 许文年，王铁桥，叶建军. 工程边坡绿化技术初探[J]. 三峡大学学报：自然科学版，2001，23(6)：512–513.(XU Wennian，WANG Tieqiao，YE Jianjun. A preliminary probing into slope afforestation[J]. Journal of China Three Georges University：Natural Science，2001，23(6)：512–513.(in Chinese)) |
|
|
|
2011, Vol. 30 
