麻竹高速宜保段膨胀土掺灰改性研究

Experimental Study on Lime-treated Expansive Soil at Yicheng-Baokang Section of Mazhu Highway

对麻竹高速公路宜城至保康段膨胀土进行了掺生石灰试验研究,通过重型击实试验、承载比试验及胀缩膨胀性试验,研究了不同掺灰比时改良土最大干密度、最佳含水量、承载比、膨胀量、胀缩总率等物理力学参数的变化,从而确定了该地区膨胀土改良的最佳掺灰比。

The expansive soils at Yicheng-Baokang section of Mazhu highway were studied in this paper. Soil improvement by lime was included in a parallel study. ThrOugh heavy compaction test, Califonia Bearing Ratio （CBR） test and swell-shrink test, the variation of compaction properties, CBR value and total swell-shrink ratio of swell soil mixed with different ratios of lime were studied. Based on these, the optimal ratio of lime for improving the expansive soil in the region was determined.