长水国际机场红土动力特性室内试验研究

LABORATORY TEST RESEARCH ON LATERITE DYNAMIC CHARACTERISTICS OF CHANGSHUI INTERNATIONAL AIRPORT

为了探究长水国际机场红土在动力荷载作用下的动力特性,通过开展一系列固结不排水动三轴试验对红土在动力荷载作用下的动变形特性进行研究。变形试验结果表明:随着围压的增大,动应力也增大,固结比越大,试样达到相同变形程度所需要的动应力越大;在相同的应变条件下,动弹性模量随着固结围压增大而增大;固结围压、固结比越大,阻尼比越大。达到相同动应力时,不同固结围压条件下的阻尼比值比不同固结比条件下的阻尼比值偏大,且在散点曲线斜率减小开始减小后,不同围压条件下散点曲线之间的间距大于不同固结比条件下散点曲线之间的间距。因此,固结围压对阻尼比的影响比固结比大。该研究成果对红土系统的深入研究及该地区实际工程应用具有重大意义。

In order to explore the dynamic characteristics of Changshui International Airport laterite under dynamic load.A series of consolidated undrained dynamic triaxial tests were carried out to study the dynamic deformation characteristics of laterite under dynamic load.The results of deformation test show that the dynamic stress increases with the increase of confining pressure.The larger the consolidation ratio is,the greater the dynamic stress is required for the specimen to achieve the same degree of deformation.Under the same strain condition,the dynamic modulus of elasticity increases with the increase of consolidation confining pressure.The greater the consolidation confining pressure and consolidation ratio,the greater the damping ratio.When the dynamic stress is the same,the damping ratio under different consolidation confining pressures is larger than that under different consolidation ratios.After the slope of the scatter curves decreases,the spacing between the scatter curves under different confining pressures is larger than that under different consolidation ratios.Therefore,the effect of consolidation confining pressure on damping ratio is greater than that of consolidation ratio.The research results are of great significance to the in-depth study of laterite system and the practical engineering application in this area.