外掺剂影响水泥加固有机质软土效果研究

Study on the effects of additives on cement-reinforced organic soft soil

以福州地区软土作为研究对象,在测试与分析土样的基本物理性质、易溶盐含量、阳离子交换容量和有机质含量等基本参数的基础上,通过对4种外掺剂方案加固后土样无侧限抗压强度值进行测试,研究了不同外掺剂方案下水泥加固软土的效果。研究表明:福州地区有机质土样的有机质含量较高。成分以富里酸为主,胡敏酸次之;为了达到更好的加固效果,应选取对富里酸和胡敏酸都有抑制作用的外掺剂,本次试验中选取的硫酸钙效果最好;对福州及沿海地区的高黏性、高有机质含量的软土,在采用水泥作为固化剂时,应结合其粒度成分、易溶盐、有机质总量和分量综合考虑,选择合适的外掺剂。

The effects of additives on cement-reinforced organic soft soil was studied with soft soil in Fuzhou area selected as the research object.Basic parameters such as basic physical properties,soluble salt content,cation exchange capacity,and organic matter content of the soil samples were tested and analyzed.The effects of cement reinforced soft soil under different admixture schemes were studied by testing the unconfined compressive strength values of soil samples after adding four types of additives.Results show that the content of organic matter in the organic soft soil in Fuzhou area is relatively high,with fulvic acid as the major ingredient,which is followed by humic acid.Therefore,in order to achieve a better reinforcement effect,an additive that inhibits both fulvic acid and humic acid should be selected and the calcium sulfate selected in this experiment works the best.For the high-viscosity,high-organic-content soft soils in Fuzhou and even the coastal areas,suitable additives should be selected according to their particle size composition,soluble salts,the total amount and weight of organic matter,when using cement as a curing agent.