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橡胶颗粒–砂混合物(橡胶砂)作为一种廉价耗能材料应用广泛,但关于其在大应变幅值范围内的模量和阻尼比特性的研究较少。本文应用循环单剪试验,对7种配比的干燥橡胶砂在4种固结压力下的动剪模量和阻尼比特性进行研究,得到其在10-3~10-1应变幅值范围的变化规律。结果表明,橡胶砂在大应变下:(1)动剪模量相对于纯砂动剪模量衰减,衰减系数随着橡胶含量的增大而降低,随着动应变幅值的增大而减小。(2)阻尼比相对于纯砂阻尼比呈增大趋势,增大系数随着橡胶含量的增大而增大,随着应变幅值的增大而减小。(3)固结压力对橡胶砂相对于纯砂动剪模量衰减系数影响较小,但对阻尼比增大系数影响较明显,表现为固结压力越高,阻尼比增大越多,随着动剪应变幅值增大,固结压力对阻尼比影响减小。(4)循环次数对橡胶砂动剪模量和阻尼比影响明显,随着橡胶含量的增加,此影响减小。
As a cheap and energy-saving material, rubber particle-sand mixture (rubber sand) is widely used, but few studies on its modulus and damping ratio in the range of large strain amplitude. In this paper, the cyclic shear test is used to study the dynamic shear modulus and damping ratio of 7 kinds of dry rubber sand under 4 kinds of consolidation pressure. The results show that in the range of 10-3 ~ 10-1 strain amplitude The law of change. The results show that under the large strain of rubber sand, (1) the dynamic shear modulus decays with respect to the pure sand shear modulus, the attenuation coefficient decreases with the increase of rubber content, decreases with the increase of dynamic strain amplitude small. (2) The damping ratio tends to increase with the damping ratio of pure sand. The increasing factor increases with the increase of rubber content and decreases with the increase of strain amplitude. (3) The consolidation pressure has little effect on the dynamic shear modulus attenuation of pure sand, but has a more obvious effect on the damping ratio increasing coefficient, which shows that the higher the consolidation pressure, the more the damping ratio increases, Dynamic shear strain amplitude increases, the consolidation pressure decreases the damping ratio. (4) The number of cycles has a significant effect on the dynamic shear modulus and damping ratio of rubber sand, with the rubber content increasing, this effect is reduced.