论文部分内容阅读
为指导北京某航天着陆冲击试验床的快速铺设,借助DRNEVICH LONG-TOR型共振柱仪开展了若干组试验,研究了含水率、干密度、围压对动剪切模量与阻尼比的影响。试验结果表明:含水率较小时,动剪切模量随含水率增大而增大,而阻尼比无明显变化;干密度增大,动剪切模量增大,阻尼比有减小的趋势;围压增大,动剪切模量增大,阻尼比有减小的趋势。对12组试验结果进行拟合表明,阻尼比与动剪切模量比之间存在很好的线性关系。同时,通过与前人研究对比表明,不同土体其动力特性不同,因此在着陆场地铺设前对土体动力特性进行研究很有必要。
In order to guide the rapid laying of an aerospace landing impact test bed in Beijing, several experiments were carried out by using the DRNEVICH LONG-TOR resonant column apparatus. The effects of moisture content, dry density and confining pressure on the dynamic shear modulus and damping ratio were studied. The results show that the dynamic shear modulus increases with the increase of water content, but the damping ratio does not change obviously when the water content is low. The dry density increases, the dynamic shear modulus increases and the damping ratio decreases The confining pressure increases, the dynamic shear modulus increases, and the damping ratio decreases. Fitting 12 test results shows that there is a good linear relationship between damping ratio and dynamic shear modulus ratio. At the same time, compared with previous studies, it is shown that different soil has different dynamic characteristics, so it is necessary to study the dynamic characteristics of soil before landing.