Mechanical Behavior Of Reinforced Embankment With Different Recycling Waste Fillers

With the rapid economic and social development,the demolition and construction of abandoned houses and the recycling of scrapped automobiles have become very common.Construction waste and waste tires are increasing in quantity,occupying a lot of space and polluting the land,which has become an urgent problem to be solved.The rational use of natural resources is one of the basic pillars of the sustainable development of modern society.The application of construction and demolition waste to geotechnical engineering is also a way to achieve sustainable development.The resource utilization of waste tires has become one of the major challenges facing the world.In this paper,the particles shape of construction waste is analyzed,the particle size distribution curve,maximum dry density,optimum moisture content and CBR value of construction waste soil and sand soil were obtained by screening test,compaction test and California bearing ratio(CBR)test.In order to study the performance of reinforced embankment with the mixture of construction waste soil and sand tire fragments under strip load,the optimum content of tire fragments was studied by comparing construction waste soil and sand tire fragments with pure sand.Through indoor model tests,the impact of the reinforcement depth,the first buried depth and the degree of compaction on the reinforced embankment by geogrid-reinforced is studied.Finally,Plaxis 2D is used to compare the two kinds of einforced embankment models,the integral deformation of the reinforced embankment is analyzed and the test data to verify the reliability of the model is compared.Research indicates:(1)The recycled construction waste aggregate has a good particle size distribution,and the compaction curve meets the requirements.It can be used as a good-performance embankment filler,and the CBR value of construction waste soil me(2)According to the results of the indoor model test,the optimal value of the tire fragment content is 5%;under the same conditions,the performance of the construction waste soil embankment and the sand,and the construction waste soil embankment bearing capacity and other performance is best.The effect of geocell reinforcement decreases with the increase of the depth of reinforcement,increases first and then decreases with the increase of the first buried depth,and increases with the increase of the degree of compaction.That is to say,the upper part of the reinforced embankment is better than the lower part.When the first layer depth is0.5B,the reinforcement effect is better,and the compactness is better.Under the same reinforced conditions,the bearing capacity of the embankment reinforced by the construction waste soil is stronger than that reinforced by the mixture of sand tire fragments.The lateral displacement of the reinforced embankment is smaller than that of the unreinforced embankment,and the lateral displacement is decreases gradually from top to bottom.Under the same load,the lateral displacement of the reinforced embankment with construction waste soil is stronger than that of the sand and tire fragments mixture.In the aspect of the earth pressure inside the embankment,the internal earth pressure decreases gradually from top to bottom;in the horizontal direction,the earth pressure under the loading plate is the largest,and the earth pressure is lower as it is closer to the two sides,but the earth pressure near the slope of the embankment is the smallest.(3)Plaxis 2D numerical simulation analysis shows that under the same load,the bearing capacity of reinforced embankment of construction waste soil is stronger than that of reinforced embankment with sand and tire fragments mixture,and the reinforcement effect of geocells decreases with the increase of the reinforcement depth;It increases first and then decreases with the increase of the first layer depth and increases with the increase of compaction degree.The lateral displacement of the reinforced embankment increases gradually from top to bottom,and the simulation results are roughly in line with the experimental results.The content of this paper provides a certain reference value for the performance research of the mixture of construction waste soil and sand tire fragments.