EPS颗粒轻质混合土蠕变特性试验研究

Creep behaviors of light-weight EPS treated soil

利用双联高压固结仪,采用分级加载和分别加载方式,对新型填土材料EPS颗粒轻质混合土的蠕变性进行了对比试验研究,并基于试验结果建立了压缩蠕变本构关系式.试验结果表明:EPS颗粒轻质混合土呈现衰减蠕变特性,不出现急剧流动阶段;压力越大,达到蠕变稳定的时间越长.由蠕变本构关系式计算的蠕变变形与试验数据对比表明,这种蠕变本构关系式总体上能够反映这种新型填土材料的蠕变特性,可应用于工程实践.

A series of tests on the creep behaviors of light-weight expanded polystyrene （EPS） treated soil were performed with single-step and multi-step loading methods by use of twin high-pressure consolidation apparatus. A compressive creep constitutive model was proposed for the light-weight EPS treated soil based on test results. The test results indicate that the light-weight EPS treated soil exhibits attenuating creep behaviors and has no sharp creep stage. The larger the load,the longer time the creep deformation reaches the steady stage. A comparison between the measured and predicted values from the creep model show that the proposed creep model can reflect the creep behaviors of the new fill material and can be applied in engineering practice.