Tao Huaqiang, Zheng Wenqian, Zhou Xuhui, Zhou Lin, Li Cuihong, Yu Yanfei, Jiang Ping
School of Civil Engineering, Shaoxing University, Shaoxing 312000, China.
Shaoxing Key Laboratory of Interaction between Soft Soil Foundation and Building Structure, Shaoxing 312000, China.
Polymers (Basel). 2023 Apr 13;15(8):1865. doi: 10.3390/polym15081865.
In recent years, expanded polystyrene (EPS) lightweight soil has been widely used as subgrade in soft soil areas because of its light weight and environmental protection. This study aimed to investigate the dynamic characteristics of sodium silicate modified lime and fly ash treated EPS lightweight soil (SLS) under cyclic loading. The effects of EPS particles on the dynamic elastic modulus () and damping ratio () of SLS were determined through dynamic triaxial tests at various confining pressures (σ), amplitudes, and cycle times. Mathematical models of the of the SLS, cycle times, and σ were established. The results revealed that the EPS particle content played a decisive role in the and of the SLS. The of the SLS decreased with an increase in the EPS particle content (EC). The decreased by 60% in the 1-1.5% range of the EC. The existing forms of lime fly ash soil and EPS particles in the SLS changed from parallel to series. With an increase in σ and amplitude, the of the SLS gradually decreased, the generally decreased, and the variation range was within 0.5%. With an increase in the number of cycles, the of the SLS decreased. The value and the number of cycles satisfied the power function relationship. Additionally, it can be found from the test results that 0.5% to 1% was the best EPS content for SLS in this work. In addition, the dynamic elastic modulus prediction model established in this study can better describe the varying trend of the dynamic elastic modulus of SLS under different σ values and load cycles, thereby providing a theoretical reference for the application of SLS in practical road engineering.
近年来，聚苯乙烯泡沫（EPS）轻质土因其重量轻且环保，在软土地区被广泛用作路基。本研究旨在探究硅酸钠改性石灰和粉煤灰处理的EPS轻质土（SLS）在循环荷载作用下的动力特性。通过在不同围压（σ）、振幅和循环次数下进行动三轴试验，确定了EPS颗粒对SLS动弹性模量（ ）和阻尼比（ ）的影响。建立了SLS的 、循环次数和σ的数学模型。结果表明，EPS颗粒含量对SLS的 和 起决定性作用。SLS的 随EPS颗粒含量（EC）的增加而降低。在EC为1 - 1.5%范围内， 降低了60%。SLS中石灰粉煤灰土与EPS颗粒的存在形式由并联变为串联。随着σ和振幅的增加，SLS的 逐渐降低， 总体下降，且 的变化范围在0.5%以内。随着循环次数的增加，SLS的 降低。 值与循环次数满足幂函数关系。此外，从试验结果可以看出，在本研究中，0.5%至1%是SLS的最佳EPS含量。此外，本研究建立的动弹性模量预测模型能够较好地描述SLS在不同σ值和荷载循环下动弹性模量的变化趋势，从而为SLS在实际道路工程中的应用提供理论参考。
