| With the improvement of living standards,the automobile industry develops rapidly,resulting in the rapid growth of waste tires,and waste tires as a kind of urgent need to solve and available solid waste,in developed countries have been used in reinforcement slope,roadbed and other geotechnical engineering.In this paper,the advantages of waste tires themselves are utilized,and the rubber particles processed into waste tires are mixed into red clay for improvement research,which is of great significance for improving the engineering properties of Guilin red clay and increasing the utilization rate of waste tires.Based on the results of laboratory tests,the mechanism of the mechanical properties of red clay of rubber particles with different mixing ratios and particle sizes was analyzed,and the conclusions were drawn as follows:?1?Test the basic test of red clay to get the basic physical property index,and provide comparison parameters for the later test.?2?According to the results of the light compaction test,when the blending ratio of rubber particles is 2%to 12%,the maximum dry density of red clay with rubber particles of 0.5mm,2mm and 4.75mm particle size is continuously decreasing,and the optimal water content is The law of change that increases first and then decreases.Guilin red clay is blended with waste tire rubber particles,during the compaction test,the additional compaction work of the elastic particle rubber particles,the particle size of the rubber particles and the weak water absorption are the factors that affect the rubber particle red clay The main reason for the change of optimal water content.?3?After the red clay is mixed with rubber particles,the contrast ratio of red clay can improve the shear strength of red clay at an appropriate mixing ratio,and the rubber particle red clay has increased shear strength.The increase of the shear strength of the red clay of 0.5mm particle size rubber particles is mainly caused by the increase of the internal friction angle,the increase of the shear strength of the red clay of 2mm particle size rubber particles is increased by the cohesion and the internal friction angle,the shear strength of red clay with 4.75mm diameter rubber particles is mainly caused by the increase of cohesion.Because the fine particles are small,the specific surface area is large,and the effective contact area with the red clay particles is large,the friction effect is increased,so the internal friction angle increases significantly;while the coarse particles have a longer flat shape,which resists under shear,with the effect of stretching,the sample showed an increase in cohesion.?4?The blending of waste tire rubber particles not only changes the soil particle gradation,but also has a certain compressibility,thereby changing the compressibility of the red clay.The compression coefficient of the rubber particle red clay increases linearly with the mixing ratio The law,that is,as the mixing ratio of rubber particles increases,the compression coefficient becomes larger.The compressive coefficients of the three types of rubber particles red clay are in the range of 0.1MPa-1?0.5MPa-1,which belongs to medium compressive soil.?5?The permeability coefficient of red clay after mixed with waste tire rubber particles was higher than that of plain red clay,the permeability coefficient of red clay increased with the increase of rubber particles.Under the action of a certain pressure,the permeability coefficient calculated indirectly can be less than the impermeable requirement of 1×10-7cm/s,the main reason why the pore shrinks and the permeability decreases under the action of pressure is that the permeability decreases. |
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