Triaxial shear test of mechanical characteristics on rubber fiber-sand mixtures based on particle flow code simulation
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摘要: 橡胶砂作为一种轻质填料在岩土工程中具有良好的应用前景，为揭示橡胶纤维-砂混合料强度特性、偏应力-轴向应变曲线及微观结构的变化规律，开展了橡胶纤维-砂不同配比的三轴剪切试验，基于颗粒流理论和PFC3D程序，对橡胶纤维-砂混合料的三轴剪切试验进行了数值模拟，并与室内试验结果进行了比较。结果表明：随着橡胶含量的增加，试样的应力-应变关系由应变软化型向应变硬化型过渡，试样剪切过程中体变形式逐渐由体胀型变为体缩型；同一围压下橡胶纤维含量高的试样变形模量小，表明橡胶材料的掺入有助于增强试样的压缩性能。Abstract: Rubber fiber-sand mixture has long been recognized as a light energy absorbing material with a good application prospect in engineering. To illustrate the variation laws of strength characteristics, curves of stress-strain and micromechanism of rubber fiber-sand mixtures, this study cinducted a triaxial shear test for different proportions of rubber fiber-sand mixture. The study performed the numerical simulation of triaxial tests on rubber fiber-sand mixtures using particle flow theory based on PFC3D, then compared the results of numerical experiments and laboratory tests. The results show that:the stress-strain relation is transited from strain softening to strain hardening, and the volumetric strain changes to shrinking from expansion gradually with the increase of the rubber fiber contents. Under the same confining pressure, the higher the rubber fiber contents are, the smaller the deformation modulus is. This indicates that the incorporation of rubber helps to enhance the compression performance of the sample.
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Key words:
- scrap tyre /
- rubber fiber /
- triaxial shear test /
- discrete element method
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图 1 橡胶纤维和砂样照片
a.橡胶纤维；b.直径0.60~1.18 mm的石英砂
Figure 1. Picture of rubber fiber and sand materials
图 2 橡胶纤维拉伸加-卸载过程的弹性行为曲线
Figure 2. Elastic behavior of the rubber fibers during tensile loading-unloading
图 7 不同围压下的应力-应变模拟曲线
Figure 7. Simulation curves of stress-strain under different confining pressures
图 8 0%橡胶纤维质量分数下的应力-应变曲线
a.应力-应变曲线；b.轴应变-体积应变曲线
Figure 8. Effect of 0% rubber fiber contents on stress-strain curves under various confining pressures
图 9 10%橡胶纤维质量分数下的应力-应变曲线
a.应力-应变曲线；b.轴应变-体积应变曲线
Figure 9. Effect of 10% rubber fiber contents on stress-strain curves under various confining pressures
图 10 30%橡胶纤维质量分数下的应力-应变曲线
a.应力-应变曲线；b.轴应变-体积应变曲线
Figure 10. Effect of 30% rubber fiber contents on stress-strain curves under various confining pressures
图 11 变形模量与围压的关系曲线
Figure 11. Relationship between deformation modulus and confining pressure
表 1 橡胶纤维-砂混合料细观参数
Table 1. Micro parameters of rubber-sand mixtures materials
材料 密度/(kg·m-3) 摩擦系数 接触刚度/(N·m-1) 黏结强度/MPa 法向 切向 法向 切向 橡胶纤维 1 150 0.6 1.5×105 1.0×105 1.5×102 1.0×102 砂 2 630 0.3 1.5×107 1.0×107 - - 墙 - 0 1.5×105 1.0×105 - - 
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