Numerical Analysis Of Plant Roots On Stability Of Subgrade Slope

As a new type of slope protection technology for green and environmental protection,plant slope protection has been widely used in engineering construction.At present,the research on plant slope protection has been extensive,but there are few researches on the plant slope protection in the frozen regions such as northeast China.Therefore,taking into account the effect of freezing and thawing on plant slope protection,several common herbaceous plant roots in the embankment slope of Harbin were considered as research objects,and the mechanical properties of the reinforced embankment slope soil were analyzed,and the freezing was explored.The effect of melting on its reinforcement.Firstly,through field investigations,four common herbaceous plants on the embankment slope of the Harbin Ring Expressway were identified as experimental objects.The indoor parameters were used to determine the basic parameters such as diameter,length,distribution density,and tensile strength of the plant roots,and through indoor geotechnical work.The tests determine the basic parameters such as the boundary moisture content,maximum dry density,and optimum moisture content of the soil.Through the single plant pull-out test,the friction effect between the plant roots and the soil was measured,and the main influencing factors affecting the friction effect between the root and soil were explored;the shear strength of the root-soil complex was measured by the direct shear test and analyzed.The influence of plant roots incorporation on the shear strength of soils;through the unconfined compressive strength test,the effect of plant roots reinforcing the soil was visually observed,and the spatial effect of plant roots in reinforcing the soil was calculated.Through freeze-thaw cycle pull-out test,direct shear test,and unconfined compressive strength test,the effect of freezing and thawing cycles on the soil reinforcement of plant roots was analyzed,and the reinforcement effect of four plant roots under freeze-thaw cycles was evaluated.Finally,the finite element software was used to establish a model to simulate the soil reinforcement of the embankment slope by plant roots,and the displacement and stress of the surface soil were obtained.Evaluate the effect of four kinds of herbaceous plant roots on the reinforcement of embankment side slope soil,and reinforce the embankment slope soil body under the condition of freeze-thaw cycle.Through research,it was found that grass planting can effectively inhibit the slippage of the soil on the slope surface,and Zoysia grass has the best reinforcement effect on the surface soil of the slope.