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采用三维颗粒流程序,模拟了堆石体的真三轴试验,不仅研究了堆石体在三维应力条件下的宏观应力变形特点,而且将细观与宏观参数联系起来,进一步完善了对堆石体的研究。试验过程采用等中主应力比路径加载。通过比较堆石体真三轴颗粒流模型试验和室内真三轴试验结果,表明颗粒流程序能较好地模拟堆石体的力学特性。颗粒流数值试验结果表明,中主应力对堆石体在三向应力状态下的强度和变形特性均有显著的影响。应力比参数b从0～1变化过程中,中主应力面先压缩后膨胀,小主应力面一直处于压缩状态;中主应力对内摩擦角、弹性模量和泊松比也均有影响。从细观上看,围压越高,b值越大,颗粒配位数越大,孔隙率越小,故从细观角度解释了堆石体的宏观应力变形现象。
The three-dimensional particle flow program is used to simulate the true triaxial test of rockfill body. The macro-stress deformation characteristics of the rockfill body under three-dimensional stress conditions are studied. And the relationship between the mesoscale and macroscopic parameters is further improved. Body research. The test procedure was carried out with equal load on the main stress path. By comparing the true triaxial particle flow model test and the true triaxial test results of rockfill, it is shown that the particle flow program can simulate the mechanical properties of the rockfill body well. Numerical results of the particle flow show that the middle principal stress has a significant effect on the strength and deformation characteristics of the rockfill under three-dimensional stress conditions. In the process of changing the stress ratio parameter b from 0 to 1, the middle principal stress surface first compresses and then expands, and the small main stress surface is in a compressed state. The middle main stress also affects the internal friction angle, elastic modulus and Poisson’s ratio. From the microscopic point of view, the higher the confining pressure, the larger the b value, the larger the particle coordination number, and the smaller the porosity. Therefore, the macroscopic stress-deformation of rockfill body is explained from the microscopic point of view.