Research On Macro And Micromechanical Properties Of Rubber-sandy Soil

With China’s economic development, the automotive industry develops quickly. The deal of waste tires cause the people’s attention. The scrap tire rubber ground with a certain size of particles are incorporated into the sand as roadbed filler works. The good rubber particle strength, flexibility and high friction characteristics are used to improve the shear strength of sand. This method can not only handle a large number of rubber tires, but also the recycling of resources. This approach has certain theoretical and practical significance.The mechanical properties of sand and rubber were studied. According to the geological characteristics of the Inner Mongolia and the factors that rubber particles content, particle size and the experimental conditions into account. By direct shear test results, the various factors on the rubber-the impact of sand light soil shear strength. This paper analyzes the microscopic parameters of the rubber-Sand influence of macroscopic mechanical properties of light soil by discrete element particles streaming software. In this paper, the following conclusions:(1) Rubber particles containing sand can increase dinternal friction angle of sand and improve the shear strength of sand. Best content rubber particles is 10%, the optimum particle size of 4 mesh.(2) Rubber-sandy soil of direct shear tests were simulated PFC2D Software. The simulation results and laboratory test results were similar. This result suggests that the software can be used to simulate PFC2D direct shear tests.(3)The shear strength of the sample and initial modulus will be changed by changing the contact stiffness of sand particles. Internal friction angle increases linearly by increasing the coefficient of friction between sand particles. Friction coefficient of sand particles have a great impact in the macroscopic properties of rubber-sandy soil. The sample with larger void ratio showed a stress hardening phenomenon and the sample with smaller void ratio showed a stress softening properties. The average coordination number of the sample with smaller void ratio is larger, and the average rotation rate is smaller. Well-graded specimen dense structure is stable and macro strength is larger. Changes in shear rate has little effect on macroscopic properties.