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对橡胶颗粒改良粉煤灰土的动强度、动模量、黏聚力和内摩擦角进行了动三轴试验研究,并将试验结果与粉煤灰土的动力特性加以对比,分析表明:粉煤灰土及橡胶颗粒改良粉煤灰土在同一围压下动强度均随破坏周数的增加而减小;在同一破坏周数下动强度随着围压的增加而增加;粉煤灰土的黏聚力为203.73 kPa,内摩擦角为11°;橡胶颗粒改良粉煤灰土的黏聚力为227.26 kPa,内摩擦角为17°,橡胶颗粒改良粉煤灰土的黏聚力增大了23.53 kPa,提高了11.55%;粉煤灰土的初始切线模量及平均动模量高于橡胶颗粒改良粉煤灰土的初始切线模量及平均动模量。研究表明,橡胶颗粒改良后的粉煤灰土具有动强度高、黏聚力和内摩擦角大的特点,从而说明橡胶颗粒改良后的粉煤灰土可以作为季冻区路基冷阻层材料。
The dynamic triaxial tests of rubber particle modified fly ash soil with dynamic strength, dynamic modulus, cohesion and internal friction angle were carried out. The experimental results were compared with the dynamic characteristics of fly ash soil. The results show that the fly ash soil And the dynamic strength of the fly ash soil modified with rubber particles decreased with the increase of the number of failure cycles at the same confining pressure. The dynamic strength increased with the confining pressure at the same failure cycle. The cohesion of fly ash soil was 203.73 kPa, and the internal friction angle is 11 °. The cohesion of rubber particle modified fly ash soil is 227.26 kPa and the internal friction angle is 17 °. The cohesion of rubber particle modified fly ash soil increases by 23.53 kPa, which is 11.55 %; The initial tangent modulus and average dynamic modulus of fly ash soil is higher than the initial tangent modulus and average dynamic modulus of rubber particle modified fly ash soil. The results show that the modified fly ash soil has the characteristics of high dynamic strength, cohesion and internal friction angle, which shows that the improved fly ash soil with rubber particles can be used as the cold resistance layer in the quaternary soil.