基于三维离散元的沥青砂浆蠕变研究

THE RESEARCH ON CREEP OF ASPHALT MORTAR BASED ON THREE-DIMENSIONAL DISCRETE ELEMENT

本文基于单轴压缩试验和单轴蠕变试验,获取不同温度和加载强度情况下沥青砂浆蠕变的荷载-位移曲线,采用1stopt软件对蠕变柔量进行拟合,获取其广义Burgers模型参数,并利用该参数进行单轴蠕变三维离散元虚拟试验。将得到的数值模拟结果和室内试验结果进行对比,对比显示在初始蠕变阶段试验结果和模拟结果有一定差异,但在稳定蠕变阶段两者趋势相同并且数值相差在一定范围值内。因此通过运用PFC模拟沥青胶浆的蠕变试验是可行的。

Based on the uniaxial compression test and the uniaxial creep test, the load-displacement curves of asphalt mortar creep under different temperatures and loading strengths were obtained.The creep compliance was fitted by 1 stopt software and its general Burgers model parameters were obtained. And use this parameter to carry out uniaxial creep three-dimensional discrete element virtual test. The results of the numerical simulation are compared with the experimental results. The comparison shows that there are some differences between the experimental results and the simulation results in the initial creep stage, but in the stable creep stage, the two trends are the same and the values are in a certain range. Therefore, it is feasible to simulate the creep test of asphalt mortar by using PFC.