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目前EPS颗粒轻质混合土的动变形特性研究主要借助于常规的动三轴剪切试验,受仪器条件限制往往不能考虑EPS颗粒轻质混合土的复杂初始应力状态,也不能考虑复杂的应力路径,比如地震、波浪以及交通荷载等。针对这一问题,利用GDS空心圆柱扭剪仪,考虑复杂初始应力状态,研究交通荷载作用下EPS颗粒轻质混合土的动变形特性,分析EPS颗粒体积比Ve/Vs、初始平均有效固结压力p0、初始固结应力比R0、初始中主应力系数b0和初始大主应力方向角α05个因素对EPS颗粒轻质混合土的动模量和阻尼比特性的影响。试验结果表明:Ve/Vs对试样动力变形特性的影响与p0有关;在相同应变水平下,随着R0增大,试样的动模量增大,而阻尼比变化不大;p0对试样动力变形特性有显著影响,相比之下α0和b0的影响较小。
At present, the study on the dynamic deformation characteristics of lightweight aggregate soil of EPS particles is mainly based on the conventional dynamic triaxial shear test. Due to the limited equipment conditions, the complex initial stress state of EPS lightweight aggregate soil can not be considered, and the complex stress path can not be considered , Such as earthquakes, waves and traffic loads. In order to solve this problem, the dynamic deformation characteristics of EPS mixed lightweight aggregate soil under traffic load are studied by using GDS hollow cylindrical torsional shears, considering the complex initial stress state. The volume ratio of EPS particles Ve / Vs, the initial average effective consolidation pressure p0, the initial consolidation stress ratio R0, the initial primary stress coefficient b0 and the initial principal stress angle α5O5 on the dynamic modulus and damping ratio characteristics of EPS lightweight aggregate soil. The experimental results show that the influence of Ve / Vs on the dynamic deformation characteristics of the specimen is related to p0. Under the same strain level, the dynamic modulus of the specimen increases with the increase of R0, while the damping ratio does not change much. The dynamic deformation characteristics have a significant effect, in contrast α0 and b0 less affected.