原状网纹红土的单轴蠕变模型研究

Research on uniaxial creep model of undisturbed reticulate red clay

网纹红土具有一定的蠕变特性,相关研究中多运用参数少、适用性强的Singh-Mitchell模型来描述网纹红土三轴蠕变试验,但还未建立合适的网纹红土单轴蠕变模型。为进一步研究在工程实际中应用更为广泛的单轴蠕变试验条件下网纹红土的蠕变及其规律,采用长沙市岳麓山地区原状网纹红土进行了一系列分级、分别加载的单轴蠕变试验。在此基础上引入Singh-Mitchell模型研究试验结果,给出了试验曲线与模型曲线的比较情况,结果表明Singh-Mitchell模型适用于单轴蠕变试验,且该模型一般情况下能更好地描述分别加载条件下的蠕变特性。

Studies show that the reticulate red clays have the creep characteristics.The Singh-Mitchell Model has the advantage of the triaxial creep behavior of this type of soil due to its suitability in a wide variety of soil properties with the minimum soil parameters.However,the description of the uniaxial creep behavior using this model has not been reported.The paper presents the one stage as well as multi-stage uniaxial creep test results on undisturbed soil samples from Yuelu Mountain,Changsha City.The Singh-Mitchell Model was used to simulate the test results and it suggested that this model has a better fit that other models.