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考虑NaOH掺量、黄土塑性指数、土样干密度、养护温度等因素,基于碱液加固黄土试验研究,揭示出:加固体强度随NaOH掺量的增加而增大,但当NaOH平均掺量超过3%时,强度增长不明显.土样塑性指数和干密度的增大,使加固体强度增大.加固体强度随养护温度的升高总体呈增大趋势,当养护温度由60℃升至80℃时,强度提高幅度显著.综合对比上述因素对加固体强度的影响得出NaOH掺量和养护温度使其强度增长最为显著.通过水稳性及冻融试验,发现CaCl_2的加入有助于提高加固体的水稳性,NaOH掺量的提高能削弱冻融作用对加固体的劣化.通过现场自渗注浆试验,得出单孔自渗注浆量与注浆时间的关系式并初步确定了碱液自渗加固的影响范围.
Considering the content of NaOH, plastic index of loess, dry density of soil sample, curing temperature and other factors, based on the experimental study of loess reinforcement, it is revealed that the strength of the solidified solid increases with the increase of NaOH content. However, when the average NaOH content exceeds 3%, the strength increase is not obvious.Improvement of plasticity index and dry density of soil samples increases the strength of the solidified body.As the curing temperature increases, the strength of solidified body increases generally, when the curing temperature rises from 60 ℃ to 80 ℃, the magnitude of the increase is significant.Comparing the effect of the above factors on the strength of the solidified body, it is found that the dosage of NaOH and the curing temperature make the strength increase the most obviously.Water stability and freeze-thaw test showed that adding CaCl 2 Improve the water-stability of the reinforcement, the increase of NaOH dosage can weaken the freeze-thaw effect on the deterioration of the reinforcement.According to the field self-infiltration grouting test, the relationship between single-hole self-infiltration grouting amount and grouting time is obtained and preliminary Determine the impact of alkali solution infiltration reinforcement.