筑坝料动力变形特性试验与颗粒流模拟

Test and Particle Flow Simulation of Dynamic Deformation Characteristics of Dam Materials

摘要:

对筑坝反滤料进行室内中型动三轴试验研究，探讨残余变形等动力特性，在此基础上，运用二维颗粒流方法，对相关试验进行数值模拟，为筑坝料的动力特性研究提供一种新的思路和途径。试验结果表明：（1）应力水平对关系曲线斜率无影响；（2）初期体积应变的读数会出现偏小的现象；（3）围压和动应力值过大，会导致模拟结果产生较大误差；（4）正确的细观参数应依据特定的试验结果反复推敲逼近而得。

Abstract:

The residual deformation behavior of dam inverted filler was investigated by means of a medium dynamic triaxial test. On this basis, numerical simulation was carried out using the two-dimension particle flow code. Based on comparison and analysis, some conclusions are summarized as follows:(1) Stress level has no effect on the slope of the relationship curve; (2) initial values of volumetric strain are smaller; (3) overvaluing confining pressure and dynamic stress will produce rather large simulation errors; (4) the correct microscopic parameters should be obtained according to results of specific triaxial tests.