甲基硅酸钠稳定黄泛区粉砂土试验研究

摘要

To evaluate the effects of methyl-sodium on silty soil from the Yellow River flooded area of eastern Henan, compaction tests, strength tests, XRD tests and penetration tests were conducted on samples of silty soil mixed with methyl-sodium.The results showed that the optimum water content and maximum dry density of the samples were affected by different mixing materials.Unconfined compression strength increased with the increasing curing time for the same mix ratio.As compared with cement stabilized silty sand with the same age, the unconfined compressive strength of cement-methyl-sodium sand increased by 17.43%, 4.61%, 16.76%, respectively.The results also showed that the strength with 7 days curing can represent that of 28 days curing.X-ray diffraction test showed that there are SiO2, CaCO3 and other compounds in the cement-methyl-sodium sand after curing for 3 days.Permeability coefficient of methyl-sodium stabilized silty sand sample was determined to be 8.84×10-5, which was effective to improve the permeability resistance of silty sand.In summary, methyl-sodium will improve the mechanical property and impermeability of silty soil.%为了研究甲基硅酸钠对黄泛区粉砂土性能的影响,对掺有甲基硅酸钠的粉砂土进行了击实试验、强度试验、XRD测试及渗透能力测试.结果表明:试样的最大干密度和最佳含水率随掺入材料的不同发生改变;无侧限抗压强度随着养生时间的增加而增加;与同龄期的水泥稳定粉砂土相比,水泥甲基硅酸钠稳定粉砂土的无侧限抗压强度分别增加了17.43%、4.61%、16.76%;7 d龄期试样无侧限抗压强度能代表28 d龄期试样的无侧限抗压强度;X射线衍射结果表明,养生3 d的水泥甲基硅酸钠稳定粉砂土中存在SiO2、CaCO3等化合物;水泥甲基硅酸钠稳定粉砂土试样的渗透系数为8.84×10-5,很好地提高了粉砂土的抗渗性.总之,甲基硅酸钠能明显改善粉砂土的力学性能与抗渗性能.