水泥改良淤泥土力学性能及变形分析

Analysis on the Mechanical Property and Deformation of Cement Improved Mucky Soil

文章采用无侧限抗压强度试验,明确水泥掺量及养护时间对改良土强度及变形特性的影响规律,研究结果可为水泥改良淤泥土的工程应用提供技术参考。通过击实试验和无侧限抗压试验发现,水泥添加后导致土颗粒团聚,随着水泥掺量的增加,最大干密度逐渐减小,最优含水率则增大。养护时间的延长使水泥改良土的强度在前14 d内显著增强,14~28 d强度增长放缓。此外,随着水泥掺量的增加,无侧限抗压强度先增后减,最优掺量为8%。水泥改良土的弹性模量和抗变形能力随着水泥掺量的增加而提高。建议路基上部使用8%水泥掺量的土作为填料,路基下部使用6%水泥掺量的土作为填料,固化性能检测在养护14 d后进行。

The unconfined compression strength test is used to clarify the influence law of cement content and curing time on the strength and deformation characteristics of improved soil.The research results can provide technical reference for the engineering application of cement improved mucky soil.Through the compaction test and unconfined compression test,it is found that the addition of cement leads to the agglomeration of soil particles,with the increase of cement content,the maximum dry density decreases gradually,and the optimal water content increases.With the extension of curing time,the strength of cement improved soil increases significantly in thefirst 14 days,and the strength growth slows down from 14 to 28 days.In addition,with the increase of cement content,the unconfined compression strength first increases and then decreases,and the optimal content is 8%.The elastic modulus and deformation resistance of cement improved soil increase with the increase of cement content.It is suggested that the soil with 8%cement content should be used as thefiller in the upper part of the subgrade,and the soil with 6%cement content should be used as thefiller in the lower part of the subgrade,and the curing performance test should be carried out after 14 days of curing.