Experimental research on dynamic characteristics of fly ash soil improved by rubber particles

Dynamic triaxial tests are carried out to research the characteristics of fly ash soil improved by rubber particles such as the dynamic strength, dynamic modulus, cohesion and internal friction angle. Comparing with the normal fly ash soil, the experiment results demonstrate the conclusions as follows. Both of the dynamic strengths of the two soils are decreasing as the destruction cycles increasing under the same confining pressure. And the dynamic strengths of the two soils are increasing as the confining pressure increasing at the same destruction cycle. The cohesion is 203.73 kPa and the internal friction angle is 11 degrees of the fly ash soil, at the same time the cohesion is 227.26 kPa and the internal friction angle is 17 degrees of the improved soil. The cohesion increases 23.53 kPa, about 11.55%. The initial tangent modulus and the average dynamic modulus are higher than the data of the improved soil. The experimental result shows that the fly ash soil improved by rubber particles has high dynamic strength, cohesion and internal friction angle large. So that rubber particles of fly ash improved soil as subgrade freezing cold season blocking layer material.