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利用室内动三轴试验研究了河道淤泥气泡混合土(FMLSS)在动力荷载作用下的动力特性,探讨了围压、水泥掺入量、气泡含量和含水率对FMLSS的动剪切模量与阻尼比的影响。结果表明:FMLSS的动剪切模量随动剪应变的增大而减小,阻尼比随动剪应变的增大而增大。当动剪应变相同时,动剪切模量和阻尼比都随着围压的增大而增大;随着水泥掺入量增大,动剪切模量增大而阻尼比减小;动剪切模量随着气泡含量和含水率的增大而减小;阻尼比随着含水率的增加先减小后增大,受气泡含量的影响不显著。FMLSS的关系曲线呈平缓衰减型,阻尼比在0.01~0.03之间,体现出FMLSS是良好的弹性材料。
The dynamic characteristics of FMLSS under dynamic load were studied by the laboratory dynamic triaxial test. The dynamic shear modulus and damping of FMLSS under confining pressure, cement content, air bubble content and moisture content were discussed. Than the impact. The results show that the dynamic shear modulus of FMLSS decreases with the increase of dynamic shear strain, and the damping ratio increases with the increase of dynamic shear strain. When the dynamic shear strain is the same, both the dynamic shear modulus and the damping ratio increase with the increase of the confining pressure. As the cement content increases, the dynamic shear modulus increases and the damping ratio decreases. The shear modulus decreases with the increase of bubble content and water content. The damping ratio decreases first and then increases with the increase of water content, but the influence of bubble content is insignificant. FMLSS curve showed a gentle attenuation, damping ratio of 0.01 to 0.03, reflecting the FMLSS is a good elastic material.