生石灰改良低液限黏土抗压强度试验研究

Experimental Research on Improvement of Compressive Strength of Low Liquid Limit Clay with Quicklime

以吉林省双阳区低液限黏土为研究对象,通过室内试验,研究了不同石灰掺入比对改良土无侧限抗压强度的影响。试验结果表明:在96%压实度下,即使是石灰掺入比为0的素土,不浸水7d无侧限强度依然能大于0.8MPa,满足路基施工要求,但该黏土遇水后易崩解,稳定性差;随着石灰掺入比的增加,改良土无侧限抗压强度逐渐增大,增长幅度逐渐变缓,遇水稳定性得到提高,改良效果明显,最佳石灰掺入比为7%。拟合试验结果,可推断出改良低液限黏土目标无限侧抗压强度所需的石灰比掺入范围。研究成果可为类似工程提供参考。

Taking low liquid limit clay in Shuangyang district,Jilin province as the research object,the influence of different lime addition ratios on the unconfined compressive strength of improved soil is studied through the laboratory test.The test results show that:even with a lime content of 0,the unconfined strength of the plain soil can still exceed 0.8MPa without being immersed in water for 7 days at a compaction degree of 96%,meeting the requirements of roadbed construction.However,the clay is prone to collapse and has poor stability when encountering water;with the increase of lime addition ratio,the unconfined compressive strength of the improved soil gradually increases,and the growth rate gradually slows down.The stability when encountering water is improved,and the improvement effect is obvious.The optimal lime addition ratio is 7%.By fitting the test results,the range of lime ratio required to improve the unconfined compressive strength of low liquid limit clay target can be concluded.The research results can provide reference for similar projects.