水泥改良黄土路基材料力学性能研究

Research on mechanical properties of cement-improved loess roadbed materials

为了探究水泥作为黄土路基改良材料时其改良土的力学性能变化规律,制备不同掺量及养护时间条件下的水泥改良土试件,分别进行抗压强度试验及直剪试验,分析水泥掺量、养护龄期变化对改良土抗压、抗剪、粘聚力及内摩擦角的影响。结果表明:水泥的掺入可以很大程度提高黄土路基的力学性能,其中水泥掺量的增大可以显著提升改良土的抗压、抗剪强度及粘聚力、内摩擦角,且对增长速率影响较大;养护龄期对改良土力学性能也有较大影响,养护龄期越长,改良土力学性能越好。

In order to explore the law of changes in the mechanical properties of the improved soil when cement is used as a loess roadbed improvement material,this paper prepares cement-modified soil specimens under different dosages and curing times,and conducts compressive strength tests and direct shear tests respectively,and analyzes the cement admixture The impact of changes in the amount and curing age on the compression,shear,cohesion and internal friction angle of the modified soil.The results show that the incorporation of cement can greatly improve the mechanical properties of loess roadbeds,and the increase in the amount of cement can significantly improve the compression,shear strength,cohesion,and internal friction angle of the modified soil,and it has an impact on the growth rate.The impact is greater;the curing age also has a greater impact on the mechanical properties of the improved soil.The longer the curing age,the better the mechanical properties of the improved soil.