The Study Of The Performance Of Waste Tires And Geocell Reinforced Embankment Slopes

In recent years, in actual embankment engineering, there are many traffic accidents caused by instability which results from the lack of subgrade bearing capacity, and these traffic accidents leads to heavy loss.Therefore, how to improve the bearing capacity and stability of embankment has become an urgent problem.In the word, the reinforceent technology of geosynthetic materials has become one of the main methods to improve subgrade bearing capacity. Geocells and tires have good performance, including good tensile, durable, corrosion, and convenient for construction, so, they are excellent geosynthetic materials applied to reinforced embankment.The shear tests on unreinforced soil, waste tires, biaxial geogrid and triaxial geogrid reinforced soil under different vertical pressure are carried by large earthwork direct shear apparatus, and then comparing the reinforcement effect of several kinds of reinforcement materials, researching and analyzing its reinforcement mechanism. The test results show that the shearing strength of the reinforced soil significantly are greater than the shear strength of unreinforced soil, and the reinforcement effect of reinforcement materials is obviouse. The reinforcement effect of triaxial geogrid is better than that of biaxial geogrid and waste tires, and the reinforcement effect of biaxial geogrid is closed to that of waste tires.The internal friction angle of reinforced soil is closed to that of unreinforced soil, while the cohesions of reinforced soil are increased significantly, which show that reinforced soils increase the shear strength mainly through increasing the cohesion.The performance of waste tires, geocell, waste tyre-geocel composite reinforced embankment are researched respectively by large model tank. According to the model test and the corresponding research and analysis, the following results and conclusions are found. Reinforced embankment can effectively improve the performance of the embankment, especially in improving the bearing capacity and enhancing the stability. The main reason is that reinforcement can improve the stiffness and entirety of embankment. The bearing capacity and stability of the embankment increases with the increase of relative density.The bearing capacity ratio of waste tires and geocell reinforced embankment decreases with the increase of the relative density of embankment. The bearing capacity of geocell reinforced embankment slope firstly increases and then decreases with the increase of the embedment depth, vertical space, whose optimal value are 10 cm.The bearing capacity and stability of the reinforced embankment slopes increase with the increase of the layer of reinforcement materials, but the increased proportion of bearing capacity decreases.The composite reinforcement effect of waste tires-geocell is better than single reinforcement effect of geocell. Reinforced embankment can not only effectively reduce the uneven settlement, but also has a great effect on the distribution of lateral displacement.Although the lateral displacements of the unreinforced and reinforced embankment firstly increase and then decrease with the increase of the depth of the embankment, but the lateral displacements of reinforced embankment is smaller than unreinforced embankment. Reinforced embankment has also an obvious effect on additional stress. Reinforcement expands the diffusion angle of additional stress, so, compared with the unreinforced embankment, reinforced embankments effectively reduce the peak value of additional stress, which make additional stress distribution becom more uniform.