黄土改性与机理研究

Study on loess modification and mechanism

为解决黄土地区因黄土本身的易崩解和抗水性能差而无法满足各类水利工程建设的问题,采用G2固化剂对黄土进行改性,通过静水崩解与吸水率、无侧限抗压强度、抗冻融循环试验来研究固化剂对黄土的改性效果。结果表明,G2固化剂均能改善黄土的工程性质,黄土改性后强度指标和水稳性优于黄土本身;固化黄土的强度特性受龄期影响明显,随着龄期的增长,抗压强度相应提升;经固化剂改性后黄土的强度受吸水率影响,改性黄土的强度随吸水率增加而减小;G2改性黄土的软化系数在0.8以上,冻融循环30次后改性黄土仍具有较高的强度,试件的整体性良好。研究结果可为黄土地区渠道、土坝护坡、边坡等工程的加固改良提供依据和指导。

In order to solve the problem that the loess is not suitable for the construction of various water conservancy projects due to its easy disintegration and poor water resistance in the loess area,the loess is modified by the G2 curing agent,through static water disintegration and water absorption,unconfined compression resistance strength and freeze-thaw cycle test to study the modification effect of curing agent on loess.The results show that G2 curing agent can improve the engineering properties of loess,and the strength index and water stability of the modified loess are better than the loess itself.The strength characteristics of solidified loess are obviously affected by age.As the age increases,the compressive strength increases accordingly.The strength of loess modified by curing agent is affected by water absorption,and the strength of modified loess decreases with the increase of water absorption.The softening coefficient of G2 modified loess is above 0.8,the modified loess still has high strength after 30 freeze-thaw cycles,and the integrity of the specimen is good.The research results can provide basis and guidance for the reinforcement and improvement of canals,earth dam slope protection,and side slopes in the loess area.