石灰掺量及不同闷料龄期对CBR值的影响

Effect of Lime Content and Curing Age on CBR Value of Improved Soils

承载比试验又称加州承载比,简称CBR(California Bearing Ration)试验,常用于检验公路路基在不利状态下的极限承载能力,是路面设计的主要参数之一。我国现在越来越多的道路工程在施工前期都会进行承载比试验,一般情况下,黏土CBR值很难达到施工设计标准,需进行掺灰改良处理。为了研究石灰掺量和不同闷料灰龄期对CBR值的影响,选取武汉至大悟高速公路某段代表性的路基土料进行测试,分析了改良土不同掺灰量的条件下对CBR值的影响,确定了三组土料的最优掺灰量,以及当土料在某种掺灰比的条件下达到标准值时不同闷料龄期对CBR值的影响。

The load-bearing ratio test was first proposed by the California Highway Administration in 1928 to compare the strength of the material when California conducted the asphalt pavement damage survey,also known as the California Bearing Ratio,which referred to as the CBR(California Bearing Ratio)test,which is used to test the extreme bearing capacity of the highway subgrade in an unfavorable state,which is one of the main parameters of pavement design.Now more and more road projects in China require the tested CBR values for the preliminary design.Under normal circumstances,the CBR value for clay is difficult to meet the construction requirements,and the subgrade soil needs the lime improvement treatment.In order to study the influence of lime content and different curing ages on CBR value,the representative subgrade soil material of a section of Wuhan-Dawu Expressway was selected for testing,and the influence of different lime mixing conditions of improved soil on CBR value was analyzed.The optimal lime mixing contents for the three groups of soil samples were determined,and the influence of different curing ages on the CBR value when the soil reached the standard value under the condition of certain lime mixing ratio.