Experimental Study on Composite Improvement of Expansive Soil by Cement/Lime and Soil Solidifying Agent
The expansive soil was improved by cement/lime and BJ-W soil stabilizer in Anhui Province.According to the liquid limit,plastic limit and free expansion rate test,the mix ratio range of the improved expansive soil was preliminarily selected.The performance change law was further analyzed by the total expansion and contraction rate,unconfined compressive strength and stability test.The test results show that when the cement/lime and BJ-W soil stabilizer were mixed to improve the medium and weak expansive soil,the liquid limit decreased gradually,the plastic limit increased gradually,the free expansion rate decreased to below 40％,and the total expansion and con-traction rate was less than 0.7％;In the unconfined compressive strength and stability test,the strength and water stability coefficient(＞80％)of the improved expansive soil increased significantly.After 5 dry-wet cycles,the strength attenuation rate was less than 20％,and the repeated expansion and contraction characteristics were significantly improved.Considering the expansion-shrinkage and strength characteristics,the effect of composite improvement by cement and BJ-W soil stabilizer is the best.The optimal mix ratio of medium expansive soil is 7％cement and 0.02％BJ-W soil stabilizer.The one of weak expansive soil is 6％cement and 0.02％BJ-W soil stabilizer.
国家科技期刊平台
NSTL
万方数据
维普
