路基填料石灰改良土弹性波速与压缩强度的相关性  

Correlation Between Elastic Wave Velocity and Compressive Strength of Improved Lime-Soil

作　　者：王建华[1] 高玉琴[1] 唐剑潇[1] 

机构地区：[1]天津大学建筑工程学院,天津300072

出　　处：《天津大学学报》2007年第4期399-404,共6页Journal of Tianjin University(Science and Technology)

基　　金：教育部科学技术研究重点资助项目(03048)

摘　　要：石灰土是高速路基工程中使用的一种重要改良填料.为了依据弹性波速评价路基改良填料的施工质量,通过大量试验研究了养护龄期、灰土比和饱和过程对石灰改良土压缩强度与弹性波速的影响,分析了压缩强度与弹性波速之间的相关性.结果表明,石灰改良土的压缩强度随剪切波速的增加而增加;不同养护龄期、不同灰土比和不同含水量的石灰改良土的压缩强度与剪切波速之间存在良好的相关关系,其相关系数大于0.95;尽管相同含水量、不同龄期、不同灰土比石灰改良土的压缩强度也随压缩波速的增加而增加,但它们之间离散性很大,相关系数小于0.82,且饱和后压缩波速增加,压缩强度降低.因此,只有依据剪切波速才能评价各种条件下石灰改良土强度特性的差异.The lime-soil is a kind of improved filling material used in the high-speed subgrade engineering. In order to evaluate construction quality of the subgrade lime-soils based on the elastic wave velocity, effects of curing ages, lime contents and saturation processes on the compressive strength and the elastic wave veiocity of the improved lime-soil were studied and their correlation was analysed by a large number of tests. The results show that the compressive strength of the improved lime-soil increases with the increase of the shear wave velocity and their good correlation can be established for the improved lime-soils corresponding to different curing ages, lime contents and water contents. The correlation coefficient is greater than 0.95. Although the compressive strength also increases with the increase of the compressive wave velocity under the same water content, different curing ages and lime contents, their correlation is poor and the correlation coefficient is less than 0.82. The compressive strength decreases and the compressive wave velocity increases after lime-soils saturated. Therefore, the compressive strength difference of lime-soils can only be evaluated based on the shear wave velocity.

关 键 词：路基填料 石灰改良土 弹性波速 压缩强度 

分 类 号：U213.1[交通运输工程—道路与铁道工程]