橡胶水泥土作为一种经济环保的耐腐蚀轻质填筑材料，在沿海港口工程及灯塔等基础建设中具有广泛的应用前景。基于共振柱试验，对不同橡胶掺量、水泥掺量和围压下橡胶水泥土动力特性展开研究，重点探究各影响因素对其动剪模量和阻尼比的影响规律。结果表明：固结压力下橡胶水泥土的累计轴向应变随着橡胶掺量和围压的增大而增大，随水泥掺量增大而减小；橡胶水泥土动剪模量曲线衰减程度随橡胶掺量的增加和水泥掺量的减小而减弱，非线性特征减弱，而受围压影响则较小；最大动剪模量随着橡胶掺量的增大而减小，随水泥掺量和围压的增大而增大。当橡胶掺量较低或水泥掺量较高时，其掺量改变对最大动剪模量影响最大；橡胶的掺入减缓了动剪模量衰减幅度，并且在较低围压下促使其更早地发生衰减。而水泥掺量的减小和围压的增大则会推迟衰减，衰减幅度也相对更大；阻尼比随动剪应变的增加而单调递增，增大橡胶掺量和减小围压会使其阻尼比增大，当水泥掺量小于15%时，阻尼比随水泥掺量增加而增大，而当水泥掺量大于15%时，阻尼比反而随之降低。
Abstract
As an economical and environmentally friendly corrosion-resistant lightweight filler material, rubberized cemented soil has many application prospects in coastal port engineering and lighthouse foundation construction. Based on the resonant column test, we investigate the dynamic properties of rubberized cemented soil under different rubber content, cement content, and surrounding pressure and focus on the influence of each influencing factor on its dynamic shear modulus and damping ratio. Test results show that the cumulative axial strain of rubberized cemented soil under consolidation pressure increases with the increase of rubber content and surrounding pressure and decreases with the increase of cement content. The degree of attenuation of the dynamic shear modulus curve of rubberized cemented soil decreases with the increase of rubber content and the decrease of cement content, and the non-linear characteristic decreases while it is less affected by the surrounding pressure. The maximum dynamic shear modulus decreases with the increase of rubber content and increases with the increase of cement content and surrounding pressure. When the rubber content is low, or the cement content is high, the maximum dynamic shear modulus is most affected by the content change. The rubber admixture slows down the dynamic shear modulus's decay and promotes its earlier decay at lower surrounding pressure. A decrease in cement content and increase in surrounding pressure delay the decay and make the decay relatively larger. The damping ratio increases monotonically with the increase of dynamic shear strain. Increasing the rubber content and decreasing the surrounding pressure will increase the damping ratio. When the cement content is less than 15%, the damping ratio increases with the increase of cement content, while when the cement content is more than 15%, the damping ratio decreases instead.
关键词
橡胶水泥土 /
动剪模量 /
阻尼比 /
配合比 /
共振柱试验
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Key words
rubberized cemented soil /
dynamic shear modulus /
damping ratio /
mix proportion /
resonant column tests
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