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对7种不同配比的橡胶颗粒-砂混合物(简称橡胶砂)进行了循环单剪试验,得出了4种不同竖向固结压力p下不同配比橡胶砂的动剪模量和阻尼比的变化规律。研究表明:同一固结压力下,橡胶颗粒的增多使得应力-应变曲线明显降低,动剪模量衰减,阻尼比和隔震消能能力提高;同一配比下,橡胶砂的应力-应变曲线和动剪模量随固结压力的增大而增大,而阻尼比则随着固结压力的增大略有降低;橡胶颗粒含量的增加,会使得动剪模量归一化G_d /G_(d max)-y_d曲线衰减更早,更有利于橡胶砂的隔震应用;与已有研究的对比分析表明,该试验结果与已有文献的试验结果吻合良好,橡胶砂混合物的动剪模量和阻尼比受试验方法的影响不大。
The cyclic shear tests on seven different rubber particle-sand mixtures (referred to as rubber sand) were carried out, and the dynamic shear modulus and damping ratio of rubber mortars with different proportions under different vertical consolidation pressure p The law of change. The results show that under the same consolidation pressure, the increase of rubber particles causes the stress-strain curve to decrease obviously, the dynamic shear modulus decrease, damping ratio and isolation energy dissipation ability increase. Under the same ratio, the stress- The dynamic shear modulus increases with the increase of consolidation pressure, while the damping ratio decreases slightly with the increase of consolidation pressure. With the increase of rubber particle content, the dynamic shear modulus normalized G_d / G_ (d max) -y_d curve attenuation earlier, more conducive to the application of rubber sand isolation; comparative analysis with previous studies show that the test results with the existing literature test results agree well, the dynamic shear modulus of rubber sand mixture and Damping ratio by the test method has little effect.