Experimental Study On The Effect Of Planting Vetiver Root On The Characteristics Of The Expansive Soil

The use of flexible reinforcement to treat the expansive disease of expansive soil has been widely used in engineering,and the effect is good.With the development of ecological slope protection technology,it is feasible to use the ecological slope protection technology to treat the problem of expansive soil edge skin disease.Can it be popular to use the developed plant root system to replace the traditional flexible reinforcement material to treat the expansive soil slope?problem.Compared with ordinary flexible reinforced materials,plant roots can improve the shear strength of soil and increase the sliding resistance of slopes,and play the role of soil anti-slip.At the same time,the upper stems and leaves of plants can play a role in slope protection,effectively reducing slope erosion.Rainfall infiltration improves the stability of expansive soil slope.As a kind of slope-protecting plant with excellent traits,vetiver has deep and dense roots,which are often used in ordinary soil slopes as slope protection plants,but can be treated with flexible reinforcement of deep and dense roots of vetiver There is still a lack of research on expansive disease problems.In order to study the effect of the root system of vetiver on the physical and mechanical properties of expansive soil,a root-soil composite sample was prepared by planting vetiver in expansive soil,and the lateral expansion-free expansion rate test was used to study the expansion of vetiver on expansive soil.The effects of sex and expansion rate showed that the root system of vetiver could effectively reduce the expansion rate without load,but the root system of vetiver had different effects on the expansion rate under different compaction conditions.The expansion of roots of vetiver grass was studied by expansion test.The effect of soil expansion force indicates that the root of vetiver can reduce the expansion force,and the expansion force decreases linearly with the increase of root content.Then the shear strength of vetiver roots on expansive soil is studied by indoor direct shear test.The results show that the root system of vetiver can effectively improve the shear strength of soil and affect the stress-strain type.The shear strength of soil increases with the root content of vetiver roots,and the roots only increase its cohesion.The force,while the coarse main root system can simultaneously improve the cohesion and internal friction angle of the root-soil composite.The stress-strain relationship of the low-rooted root-soil composite is strain-hardening,while the high-rooted root-soil composite exhibits strain-softening.