典型草本植物防护砂性土边坡表层土体作用分析
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摘要
通过典型草本植物护坡含根系砂性土直剪试验,得到草本植物防护作用下砂性土边坡表层含根系土的抗剪强度,分析了典型草本植物通过根系力学作用及植被水文效应两方面对砂性土边坡表层土体的防护作用。草本植物能够有效截留降雨、削弱溅蚀,抑制地表径流、控制土粒流失、降低孔隙水压力、提升土体黏聚力,以及增加土体抗剪强度。
A large number of sand-soil slopes,sand foundations,and sand dams were built in construction of northern China.The vegetation revetment technology was an important method to control sandy soil slope.And the protective effect should be discussed intensively.According to the direct shear test of sandsoil with root system for the typical herbaceous plant slope protection,the shear strength of soil on the surface of sandy soil slope with the protection of herbaceous plants could be obtained.The protective effects of the typical herbaceous plant for the surface soil of sandy slope were analyzed by mechanical effect of root system and hydrological effect of vegetation.The soil erosion could be controlled,the pore water pressure in soil could be reduced and the cohesive force of soil could be enhanced with the protection of herbaceous plants.And the shear strength of sand-soil slope surface is increased.
A large number of sand-soil slopes,sand foundations,and sand dams were built in construction of northern China.The vegetation revetment technology was an important method to control sandy soil slope.And the protective effect should be discussed intensively.According to the direct shear test of sandsoil with root system for the typical herbaceous plant slope protection,the shear strength of soil on the surface of sandy soil slope with the protection of herbaceous plants could be obtained.The protective effects of the typical herbaceous plant for the surface soil of sandy slope were analyzed by mechanical effect of root system and hydrological effect of vegetation.The soil erosion could be controlled,the pore water pressure in soil could be reduced and the cohesive force of soil could be enhanced with the protection of herbaceous plants.And the shear strength of sand-soil slope surface is increased.
引文
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[2]郭维俊,黄高宝,王芬娥,等.植物根系若干力学问题研究[J].中国农机化,2006(2):84-88.
[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.
[4]雷胜友.现代加筋土理论与技术[M].北京:人民交通出版社,2006.
[5]南京水利科学研究院土工研究所.土工试验技术手册[M].北京:人民交通出版社,2003.
[6]李勇,朱显漠.植物根系与土壤抗冲性[J].水土保持学报,1993,7(3):11-18.
[7]李勇.黄土高原植物根系与土壤抗冲性[M].北京:科学出版社.1995.
[8]吴彦,刘世全,王金锡.植物根系对土壤抗侵蚀能力的影响[J].应用与环境生物学报,1997,3(2):119-124.
[9]吴彦,刘世权,付秀琴,等.植物根系提高土壤水稳性团粒含量的研究[J].土壤侵蚀与水土保持学报,1997,3(1):45-49.
[10]刘国彬,蒋定生,朱显漠.黄土区草地根系生物力学特性研究[J].土壤侵蚀与水土保持学报,1996,2(3):21-28.
[11]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.
[12]姜志强,孙树林.堤防工程生态固坡浅析[J].岩石力学与工程学报,2004,23(12):2133-2136.
[13]阿比一时,岩本胜.树木根系在防止滑坡中的土力学作用(续)[J].中国水土保持,1989(12):35-40.