龄期对电阻率法检测赤泥改良黄土抗剪强度的影响

随着我国氧化铝产能的不断增大,在生产时排放出的污染性废渣赤泥给环境带来多方面的影响,所以合理地利用并消纳赤泥就显得尤为重要.本文利用赤泥配制5种固化剂对黄土进行改良,将赤泥改良后的黄土用于路基材料.试验测试了改良黄土在直剪过程中电阻率的变化,分析了龄期对赤泥路基材料的电阻率和抗剪强度的影响.通过击实试验确定试样的最优含水量,在最优含水量下制样并养护3 d、7 d、14 d、28 d.结果表明:不同龄期下电阻率随剪切位移的增大呈现上升趋势;电阻率和抗剪强度分别与龄期的对数相关性较好,二者都随养护龄期的增大而增大;随着赤泥掺入量的增大,导电离子增多,电阻率减小;相同赤泥含量下,垂直压力越大,抗剪强度越大;得到抗剪强度与电阻率的线性关系式.

Effect of Age on Detecting Shear Strength of Loess Improved by the Red Mud in Resistivity Method

As the comprehensive utilization of red mud is not high,a large number of red mud which is stacked bring a negative impact on the environment,so improved the utilization of red mud is particularly important.Five kinds of curing agents were used to improve the loess,the electrical resistivity of the modified loess was measured during direct shear,and the influence of age on the electrical resistivity and shear strength of the red mud roadbed were analyzed.The optimum water content was determined by compaction test,and the samples were cured at the optimal water content for 3 d,7 d,14 d and 28 d.The results show that electrical resistivity increase with the increase of deflection in different age.The electrical resistivity and shear strength are logarithmically correlated with age,and they increase with the curing age.With the increase of red mud incorporation,the conductive ions increased,the electrical resistivity decreased.Under the same red mud content,the shear strength increases with the increase of vertical pressure.The linear relationship between shear strength and electrical resistivity is obtained.