红砂岩改良土无侧限抗压强度影响因素试验研究

Experimental Study on Influence Factors of Unconfined Compressive Strength of Improved Red Sandstone Soil

以东昌高速公路强风化红砂岩为研究对象,以无侧限抗压强度作为改良红砂岩性能评价指标,分析了改良剂类型及掺量、试样龄期、压实度、土体最大粒径等因素对无侧限抗压强度的影响。试验结果表明:水泥改良红砂岩无侧限抗压强度随着水泥掺加量、养护龄期和压实度的增大而增大,且前7d的强度增幅较大;石灰改良红砂岩强度存在一个最佳石灰掺加量,并随着养护龄期和压实度的增大而增大,且后期强度增长幅度较大,以28d龄期强度值评价石灰改良红砂岩较合适。

In this paper,the strong-weathered red sandstone from Dongchang Expressway was taken as the object of study,and the unconfined compressive strength was used as the index to evaluate the soil performance.Based on that the effects of different dosage,curing age,compaction degree and particle size on the unconfined compressive strength of the soil improved by different modifiers were studied.The experimental results showed that the strength of the cement improved soil increased with the increase of cement content,curing age and compaction degree,and the strength of the first 7days increased greatly.The strength of lime improved soil has the best adding amount,and it increases with the increase of curing age and compaction degree,and the later strength increases greatly.It is more suitable to evaluate the lime improved soil with the strength value of 28 th age.