Model Test And Numerical Analysis Of Polymer Material On The Reinforcement Of Sandy Soil Slope

Landslide is one of the most common geological disasters.Retaining structures,grouting and construction of drainage system etc.are the most common measures for the control of landslide,and these measures are closely related to concrete engineering.However,the conventional concrete construction has the shortcoming of long coagulation time,long operating cycle,slow construction speed,and it is easy to produce a lot of liquid and solid wastes.After research,it is found that the high polymer material has the merits of short setting time,convenient construction,good durability and it would not produce divergent pollution to the environment.Hence,this paper puts forward the idea of polymer grouting on the treatment of landslide,and then through the combination of model tests and numerical simulation methods,the feasibility and effectiveness of the polymer grouting on the reinforcement of sandy slope were studied.The obtained conclusions are as follows:(1)The experimental study of high polymer grouting on the reinforcement of sandy slope(i.e.,the slope surface is covered with the mixture of polymer material and soil)was carried out.The slope displacement under multistage surcharge load was compared and analyzed.The experimental results indicate that the unreinforcement slope collapsed at 30 kPa surcharge load,but the slope after reinforcement did not deform much at 48 kPa surcharge load.At the same time,the displacement and the deformation of the slope are well constrained.Hence,the reliability and validity of the control of sandy landslide by covering the soil reinforced with high polymer is verified to a certain extent.(2)The experimental study of the reinforcement of sandy slope by piles made of high polymer was carried out.The slope displacement under multistage lateral load was compared and analyzed.The experimental results indicate that compared to the unreinforcement slope,the bearing capacity(i.e.the additional load applied before the slope loses stability)of the slope after reinforcement by single row of polymer piles and double rows of polymer piles can be increased from level 5(1500 N)to level 6(1800 N)and level 8(2400 N),respectively,the slope stability can be increased to a certain degree.At the same time,the displacement and the deformation of the slope are well constrained.(3)The two types of model tests mentioned above were simulated by means of numerical calculation method.The numerical results indicate that the finite element method can simulate the model tests well,the displacement,deformation and overall macroscopic phenomenon are relatively close,which validates the effectiveness of numerical method in the simulation of the treatment of landslide,and it can be further applied in landslide study in the future.(4)The application of polymer grouting in the control of landslide example was simulated.Through the strengthening of the soil on the sliding surface by polymer grouting,the deformation as well as the frontal uplift phenomenon of the slope are obviously reduced.Hence,the feasibility and effectiveness of landslide control in engineering practice by polymer grouting is proven through numerical method.(5)Based on the model test results of covering high polymer and high polymer piles,combined with the numerical analysis method,the effectiveness of high polymer material on the reinforcement of slope control is proven from the difference of slope displacement,deformation and capacity etc.,what is more,the high polymer has the merit of short setting time,which should have good application prospect.