改良黄土渗透试验研究

以改良黄土的水力学性质优化分析为核心,研究了改良黄土的渗透性能和渗透过程中渗透系数的变化。通过对黄土添加水泥、石灰和粉煤灰作为改良材料,进行了改良黄土渗透性试验。试验结果表明,在击实试验控制干密度情况下且改良材料含量较低情况下,随着改良材料含量的增大,改良黄土的渗透系数呈增大趋势,黄土的结构性明显得到了改善;渗透过程持续,随着改良黄土中石灰、水泥和粉煤灰-水泥混合物水化作用的进行,改良黄土的渗透系数呈减小趋势。因此,根据工程需要,可以通过进一步优化改良材料添加配比方案,在改良渗透性能的基础上增加强度,满足黄土地区施工安全要求。

Research on Permeability Experiment of Modified Loess

With the optimization analysis purpose of modified loess hydraulics properties in loess regions, the modified loess permeability was studied. By mixing cement, lime and fly ash as modified material, the modified loess permeability tests were conducted. The test results showed that, under the condition of the dry density controlled and less modified material content, the modified loess permeability coefficient increased with increase of modified materials; due to an increase content of lime, cement and fly ash-cement mixed material, the physical structure were improved particularly. And proceeding with permeability process, the permeability coefficient of loess decreased following the hydration of lime, cement and fly ash-cement mixed material. On the basis of engineering requirements, further optimized proportion of modified materials could improve the permeability and increase strength.