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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。
The main mechanism of rockfilling rheology is due to water level changes, rainfall infiltration, sun and rain and other environmental factors led to the nature of rockfill material deterioration, at the same time, the particles have high contact stress - crushing and rearrangement - stress release, adjustment and Transfer, the process is repeated due to the continuous deterioration of the particles. In the method of discontinuous deformation analysis of rockfill (SGDD) considering particle breakage, the model of particle strength degradation is introduced to reflect the continuous deterioration of particle strength with the external environment. The numerical simulation of rockfill triaxial rheological test is carried out by this method. The simulation results are consistent with those observed in laboratory tests. It shows that the SGDD method considering rheological effect grasps the main mechanism of rockfill rheology and is suitable for simulating the rheology of rockfill materials Deformation of this complex, nonlinear evolution problem. The numerical results show that the rockfill material has a great influence on the macro-rheological deformation due to the deterioration of the external environment, the degradation rate and the strength of the rock mass.