考虑压实度、掺灰量及养护龄期的石灰土强度经验预估公式

Empirical Formula for Estimating Strength of Lime Mixed Soils Considering Degree of Compaction,Lime Ratio and Curing Age

为探讨压实度、掺灰量及养护龄期和含水率对石灰土强度的影响,配制5%石灰的宿迁粘土,制样并在标准养护室养护7 d后进行无侧限抗压强度试验,分析了孔隙率、掺灰量及龄期、含水率对无侧限抗压强度的影响,并讨论了石灰土无侧限抗压强度的影响因素。试验结果表明,石灰土无侧限抗压强度随着压实度的增加而线性增加,随着掺灰量的增加近似线性地增加,随着固化时间的推移不同掺灰量的石灰土样呈不同幅度的增长,而含水率的变化并未对石灰土的无侧限抗压强度产生明显的影响。提出了一个能够综合反映压实度、石灰掺入量及养护龄期等因素对石灰土强度影响规律的综合表征参数,具有一定的工程意义。

In order to explore the effects of the degree of compaction,lime content,curing age and water content on the strength characteristics of lime mixed Suqian clay samples,the lime mixed soil samples are prepared and tested.Usually,the lime mixed soil sampled was prepared under the laboratory standard curing conditions for 7 days and tested for the unconfined compressive strength.The factors such as,void ratio in the mixed sample,lime content and sample moisture content,on the unconfined compressive strength are studied.The experimental results show that the unconfined compressive strength of lime mixed soil sample increases linearly with the increase of degree of compaction,increases approximately linearly with the increase of lime content,and increases differently with the curing age.While the change of water content does not have a significant effect on the unconfined compressive strength of the lime mixed soil.In this paper,a comprehensive characterization parameter that can comprehensively reflect the influence of the degree of compaction,lime content and curing age on the strength of the lime mixed soil is proposed,which a certain engineering significance.