高沙土地区砂土抗渗透特性改良室内试验研究

Laboratory study on penetration resistance of sandy soil modified in high sandy soil area

针对高沙土地区砂土结构松散存在漏水、漏砂的问题,采用固化剂和粉煤灰两种添加剂对其进行改良,对不同添加剂含量的改良砂土进行了成膜试验和变水头渗透试验。结果表明:土体表层的固化层厚度随固化剂含量增加,有助于改善砂土的渗透性能。在相同养护时间下,砂土的渗透系数随固化剂浓度以及粉煤灰含量的增加而减小,可以看到增加了土壤添加剂达到了很好的防渗效果。

Aiming at the problems of water leakage and sand leakage in the loose structure of sandy soil in high sand area,two kinds of additives,solidified agent and fly ash,were used to improve it.The film-forming test and variable head permeability test were carried out for the improved sandy soil with different additive contents.The results show that the thickness of solidified layer increases with the content of solidified agent,which is helpful to improve the permeability of sand.Under the same curing time,the permeability coefficient of sand decreases with the increase of the concentration of curing agent and the content of fly ash.It can be seen that the increase of soil additives has achieved good anti-seepage effect.