Experimental Study On Physical And Mechanical Properties Of Soil Complexd With Rice Straw And Flocculent Roots

With the deterioration of the environment,the ecological protection form of green vegetation has been paid more attention.Solid soil of plant roots has become a hot topic in interdisciplinary research."Root soil complex" constitute by the roots and soil.The water and soil loss of slope surface can be reduce and soil strength and stability of shallow slope can be improved because of physical activity of roots.Physical and mechanical effects of soil root composite should be researched to provide the theoretical basis in analysis slope stability and slope ecological protection.Based on field research and collect a lot of information,physical and mechanical properties of soil complexd with rice straw and flocculent roots have been researched in this thesis.Firstly,field tests and laboratory remodeling tests of Zoysia flocculent roots have been comparative analysis,the larger the flocculent roots content,the stronger anti-disintegration of soil root composite.Meanwhile,rice straw is used as an eco-friendly material,it can be mixed with the soil to become root soil composite material which can be improved the anti-disintegration of soil through the laboratory disintegration test,meanwhile the larger the rice straw content,the stronger anti-disintegration of root soil composite.Secondly,through the shear strength tests of root soil composite which found the ability of soil shear strength could be improved.Meanwhile,the shear strength of soil root composite could be large changes by the content of root or water.Especially cohesive stress changes,but internal friction angle is less affected.The larger root content and the lower water content,the stronger shear strength of root soil composite.Finally,situ comparison test was tested by double-loop permeation test devicein in the site which had Zoysia flocculent roots and no roots.The injection flow and the final permeability coefficient were adopted as a evaluation criteria.The results showed that Zoysia flocculent root can significantly improve the permeability of soil.Zoysia roots is growing in space flocculent structure and criss-cross in the soil that constitute a good guide water channels which improve the infiltration capacity of the soil.