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应用锚杆拉力计和项目组自行设计改进的剪切箱,原位测定了不同深度(10 cm,20 cm)分蘖期香根草根系固土、单根拉力。结果表明,在给香根草施加载荷初期,根系都会发生弹性形变,荷载与位移都按比例增加,呈现一定的线性关系。当载荷超过根系抗拉极限后,随着拉力的继续增加,根系发生塑性形变,载荷与位移关系逐渐偏离直线,反映出非线性弹性特征,测定的土体样方与土体分离。但与裸土样方相比,在施加同样载荷的情况下,有根样方位移明显要小于无根样方,说明香根草具有一定的固土能力,并且根系入土越深,植物固土能力越强。
An anchorage tension meter and the project team designed the improved shear box to measure the root anchoring soil and root tension of Vetiveria zizanioides at different depths (10 cm, 20 cm) at the tillering stage in situ. The results showed that at the initial stage of applying the load to the vetiver, the root system will undergo elastic deformation, and the load and displacement all increase proportionally, showing a certain linear relationship. When the load exceeds the root tensile limit, the root plastic deformation occurs with the increase of tensile force, and the relationship between load and displacement gradually deviates from the straight line, reflecting the nonlinear elastic characteristics. The measured soil sample is separated from the soil. However, compared with the bare soil sample, under the same load applied, the displacement of the root sample was significantly less than that of the rootless sample, indicating that the vetiver grass has certain soil solidification ability, The stronger the ability.