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| Indoor Experimental Research on the Unconfined Compressive Strength of Modified Soft Soil |
| ZHENG Jiang1，SHU Hai—ming2，DAN Han—cheng3 |
| 1．China Railway Group Limited，Beijing 100055，China；2．Guizhou Communication Planning Survey ＆ Design Academe，Guiyang，Guizhou 550001，China；3．Central South University，Changsha，Hunan 410075，China |
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Abstract Research purposes:Unconfined compressive strength is the key index for evaluating the performance of modified soil．In this paper，the comparison of unconfined compressive strengths of cement modified rock and lime modified rock are studied，the basic law of blend ratio for lime modified soil is revealed by doing experiment，and the influences of maintenance condition，age and compactness on the unconfined compressive strength ale analyzed．The results show that under the condition of equal compactness，the unconfined compressive strength of cement modified soft rock iS better than lime modified soft rock．
Research conclusions: It is concluded from the experiment that as there is no optimal blending ratio，the unconfined compressive strength of cement modified soft soil increases with the increase of blending amount of cement，the cement modified soft rock has good property of water stability and the unconfined compressive strength can not reach at the max value at the optimal water content under the condition of equal compactness，and the maintenance is needed in the process of filling modified soil．
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Received: 01 June 2009
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2009, Vol. 26 
