浸水环境下石灰改良土无侧限抗压强度试验研究

Experimental Study on Unconfined Compressive Strength of Lime Modified Soil under Submerged Environment

以长双公路沿线的粉质黏土为研究对象,通过室内试验研究石灰掺量、压实度、养护龄期和养护条件对其无侧限抗压强度的影响。试验结果表明:随着石灰掺量的增大,改良土最佳含水率和最大干密度的变化呈现相反的趋势;改良土的无侧限抗压强度与石灰掺量、压实度、养护龄期均呈正相关关系,浸水养护1 d后改良土强度衰减24%~45%;标准养护条件下,改良土的无侧限抗压强度受压实度影响程度最大,石灰掺量其次,养护龄期影响程度最小;综合认为最佳石灰掺量为7%。

Taking silty clay along Changshuang highway as the research object,the effects of lime content,compaction degree,curing age and curing condition on the unconfined compressive strength of silty clay were studied by laboratory tests.The results showed that with the increase of lime content,the changes of the optimum moisture content and the maximum dry density of the modified soil show opposite trends.The unconfined compressive strength of the modified soil is positively correlated with lime content,compaction degree and curing period,and the strength of the modified soil decreases by 24%~45%after soaking in water for 1 day.Multiple linear regression is used to fit the test results of standard curing group,and the fitting results is satisfactory.Under standard curing conditions,the influence of unconfined compressive strength of the modified soil is the highest,followed by lime content,and the least by curing period.The optimum lime content is 7%.