颗粒劣化效应的堆石料流变细观数值模拟

堆石料流变的主要机理是由于水位变化、降雨入渗、日晒雨淋等环境因素导致堆石料发生性质劣化，与此同时，颗粒发生高接触应力-破碎和重新排列-应力释放、调整和转移，这一过程由于颗粒的持续劣化而不断重复。在考虑颗粒破碎的堆石体不连续变形分析方法(SGDD)中，引入颗粒强度劣化模型反映颗粒强度随外界环境的持续劣化。应用该方法进行堆石料三轴流变数值试验，模拟结果与室内试验所观察到的规律一致，表明考虑流变效应的SGDD方法抓住堆石料流变的主要机理，适合模拟堆石料的流变变形这一复杂的、非线性演化问题。数值试验结果表明，堆石料随外界环境的劣化程度、劣化速率、母岩强度对宏观流变变形有较大影响。

Mesomechanically numerical simulation of rockfill rheology based on particle deterioration

The main mechanism of rockfill rheology can be attributed to the rockfill deterioration due to variation of water level,rainfall infiltration,weathering and other environmental factors.At the same time,the particles have high contact stress-broken and rearrange-stress release,adjustment and transfer,this process incessancy owning to the continuous particle degradation.In the framework of deformable discrete element method,the stochastic granular discontinuous deformation method(SGDD) considering particle breakage is employed with the introduction of the strength degradation model to reflect the particle degradation.The method is employed to rockfill triaxial creep numerical experiments;the simulation results are consistent with indoor test ones.It is shown that the SGDD method considering rockfill creep caught the main mechanism,is suitable for simulation of rockfill creep deformation.Numerical experimental results show that with the external environment the degradation degree,degradation rate,parent rocks intensity has great influence on the macroscopic rheological deformation.