交通荷载下石灰改良软土路基的动力特性试验研究

Test Study on Dynamic Characteristics of Lime Stabilized Soft Soil Subgrade under Traffic Loading

以上海宝山区某软土路基为对象,采用石灰进行改良,对石灰改良软黏土开展了动三轴试验,研究了在不同掺灰量、围压和固结比条件下,石灰改良路基土的动强度和临界动应力特性。试验研究结果表明:掺灰量、围压和固结比对石灰改良土的动力特性有较大影响,动强度与临界动应力随着掺灰量、围压和固结比的增加而增大;围压对临界动应力的影响最大;较大围压时,对于掺灰量一定的石灰改良土,其临界动应力保持在相对稳定水平。

Taking a soft soil subgrade in Baoshan District,Shanghai as an object,with stabilization by lime,dynamic triaxial test was carried out on the lime stabilized soft clay so as to study,under different conditions of lime content,confining pressure and consolidation ratio,the characteristics of dynamic strength and critical dynamic stress of the lime stabilized subgrade soil.The results show that the lime content,confining pressure and consolidation ratio have large effect on the dynamic characteristics of lime stabilized soil to the extent that the dynamic strength and critical dynamic stress increase with the lime content,confining pressure and consolidation ratio; the confining pressure has maximum influence on the critical dynamic stress and,when it is relatively high,the critical dynamic stress of lime stabilized soil with definite lime content will keep at a relatively stable level.