Laboratory Study On Mechanical Properties And Water Stability Of Reinforced Soil With Straw Roots

At present,widely used in slope vegetation protection,mainly considering the root soil composite reinforced mechanical effect and the effect of rain erosion control,rarely in the premise of reinforcement effect under the influence of different vegetation on the slope rainfall infiltration and slope stability.In this paper,on the basis of collecting the data,through the method of indoor direct shear test and laboratory simulation,variable head immersion disintegration test,study the root of tall fescue shear strength,permeability and disintegration of the anti effect on soil,variation and water stability characteristics of root reinforcement effect,for future research and optimization the design of plant ecological slope protection reference.The main research contents and achievements of this paper are as follows:(1)Statistical study on various indexes of tall fescue in different growth periods.According to the general engineering soil spray sowing index of planting,the growth status of tall fescue growth period of plant roots,get the statistical regularity of the root growth of tall fescue.(2)Growth period(different root content)shear strength index determination of root soil complex.Through indoor direct shear tests of root soil composites at different growth stages and depths,the corresponding shear strength indexes of root soil composites under rainfall infiltration were obtained.(3)The permeability test of root soil complex under different root content.The permeability test was carried out in the root soil complex of different vegetations and different depths,and the permeability coefficient of root soil complex under different root content was measured.(4)The disintegration test of indoor water immersion with different soil quality.The effects of different root parameters and rice straw on the disintegration characteristics of different soil root and soil complexes formed by the combination of grass roots,rice straw,straw and rice straw were studied,and the effect of rain infiltration on different roots was analyzed.Experimental research shows that:1)The effect of plant root was reinforced,the cohesion c value with root content grows larger,the internal friction angle changes slightly,the growth direction and root effect on root soil,complex is obvious,mixed root cohesion is greater than the reinforced soil,the vertical growth at the end of the anti shear strength and vertical pressure are in line with the Kulun Moore's law;2)The permeability coefficient of k with root volume increased,root through the soil into the water channel,increase rainwater infiltration rate,and good adhesion formed between plant roots and soil,when immersed in a lot of rain,the soil root traction,making soil is not completely collapse to soil and good anti slip effect;3)Soil disintegration group was more than the root volume group,floc disintegration of rice straw disintegrating group was more than grass plus rice straw group amount to disintegrate,straw and rice straw.The combination of the soil and the soil has a good effect on the stability of the soil.