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根据堆石颗粒破碎具有时间效应的特点来研究堆石料的流变性质。首先建立了基于亚临界裂缝扩展的堆石流变细观模型;其次研究流变数值试验的模拟方法,确定合理的颗粒破碎模式,根据两步循环判定法的思想计算宏观时间,并编写了相应的颗粒流程序;最后结合室内流变试验,开展单轴压缩条件下数值流变试验,拟合室内流变试验曲线,确定细观参数。计算表明:数值试验与室内试验流变曲线发展趋势基本一致;颗粒破碎模式对结果有一定的影响,越接近块体实际情况,模拟结果越好;流变的大小主要由瞬时颗粒破碎决定;流变的长期性由微裂缝扩展导致的延时颗粒破碎造成。
The rheological properties of rockfill materials are studied based on the time-effect characteristics of rockfill particles. First, the microfacies model of rockfill flow based on subcritical crack propagation was established. Secondly, the simulation method of rheological numerical experiment was studied to determine the reasonable particle crushing mode. The macroscopic time was calculated according to the idea of two- Finally, in combination with the indoor rheological tests, the numerical rheological tests under uniaxial compression were carried out to fit the indoor rheological test curves and determine the mesoscopic parameters. The results show that the development trend of numerical test is in good agreement with that of laboratory test. The mode of particle crushing has a certain effect on the result. The closer it is to the actual condition of block, the better the simulation result. The size of rheology is mainly determined by instantaneous particle crushing. Variable long-term caused by the propagation of micro-cracks caused by the particle breakage.