复掺水泥+聚丙烯纤维改良淤泥质废弃软土试验研究

Experimental Study on Improvement of Mucky Waste Soft Soil by Adding Cement and Polypropylene Fiber

为了实现淤泥质废弃软土的再生利用,采用水泥+聚丙烯纤维的复掺方式对淤泥质软土进行了改良试验,探讨分析了不同改良方案下淤泥质软土的工程力学特性和耐久性。结果表明:随着水泥掺量的增加,改良土的最优含水率和强度逐渐增大,最大干密度逐渐减小,水稳性能也随水泥掺量增多而逐渐提升;聚丙烯纤维掺量对最优含水率的影响不是很明显,但能提升改良土的强度和水稳性能,最大干密度随纤维掺量增大而逐渐降低;纤维掺量越高,改良土在干湿循环作用下的累计质量损失率越大,当纤维掺量为0.3%时,改良土的强度最大;通过试验得出淤泥质软土的最佳改良方案为:水泥10%+聚丙烯纤维0.3%+压实度96%。

In order to realize the recycling of the mucky waste soft soil,the improvement test of the mucky soft soil was carried out by using the compound mixing method of cement and polypropylene fiber,and the engineering mechanical properties and durability of the mucky soft soil under different improvement schemes were discussed and analyzed.The results show that the optimal water content and strength of the improved soil gradually increase with the increase of cement content,the maximum dry density decreases and the water stability increases with the increase of cement content;the effect of polypropylene fiber content on the optimal moisture content is not obvious,but it can improve the strength and water stability of the improved soil,and the maximum dry density gradually decreases with the increase of fiber content;when the fiber content is 0.3%,the strength of improved soil is the largest;through the test,the best improvement scheme of muddy soft soil is:10%cement+0.3%polypropylene fiber+96%compaction.