草本植物根系网的固土机制模式与力学试验研究

针对生物软措施的力学固土护坡作用进行了力学机制方面的探讨,提出植物根系网固土力学机制模式的四个层次,以及对不同草本植物根系的固土性能进行了力学试验比较。结果表明不同植物根系具有不同的抗拉强度。香根草根系平均抗拉强度最大达85 m Pa,其次为假俭草,平均抗拉强度27.3 m Pa,白三叶根系平均抗拉强度为24.6 m Pa,莎草根系平均抗拉强度为24.5 m Pa,宜安草根系平均抗拉强度为19.7 m Pa,百喜草根系平均抗拉强度为19.23 m Pa,马尼拉草根系平均抗拉强度为17.5 m Pa,狗牙根根系平均抗拉强度为13.45 m Pa。不同的植物根系具有不同的抗拉强度、不同的固土性能与其遗传结构及其组织材料不同有关。充分了解和认识植物根系固土性能,科学合理运用生物软措施代替或部分代替工程措施在我国繁重的生态环境保护和恢复的基本建设工程项目中具有重要的应用价值和意义。

An Experimental Study on Mechanic Performance and Mechanism of Soil-reinforcement by Herb Root System

A study carried out on the mechanic function and the mechanism of soil reinforcement by herb root system was discussed,in which there are four primary functions analyzed and four sorts of soil-stabilities in using herb roots are raised and an experimental comparison with mechanics in the function of soil-reinforcement of various herb roots was conducted.The results were revealed that various roots have different tensile strength.Thus,the maximum of tensile strength of Vetiver grass(Vetiveria Zizanioides) reaches 85 mpa;secondly,Common Cetipede grass(Eremochioa ophiuroides hack),(27.3);White Clover(trifolium repens),24.64;Late Juncellus(Juncelles serotinus),24.50;Dallis grass(Paspalum dilatatum poir),19.74;Bahio grass(paspalum notatum flugge),19.23;Manila grass(Zoysia matrella merr),17.55;Bermuda grass(Cynodon dnactylo),(13.45).Different tensile strength of various roots and performance of soil reinforcement are discussed and revealed that the difference is concerned with the gene variety and tissue structure.Up to the present it is quite important and necessary for us to make use of soft engineering approach instead of hard engineering approach in all or partly,so as to protect natural resource and restore environment during peak time of primary construction in China.