Experimental study on water stability of Yellow River silt solidified by soybean-urease induced carbonate precipitation
With the proposal of the national strategy of"transportation power"and the rapid development of engi-neering construction along the Yellow River,the demand for filling soil has increased dramatically.The feasibility of theYellow River silt as fill material has been confirmed,but its service performance in rainy areas needs to be improved.Exploring an ecological and efficient silt reinforcement method to improve its water stability is critical.Based on this,enzyme-induced calcium carbonate precipitation(EICP)curing of the Yellow River silt is proposed in this paper.Water stability tests on the cured Yellow River silt under conventional immersion conditions and dry-wet cycle conditions were carried out respectively.The mass loss and strength loss of the samples after immersion were studied.The effect law of dry-wet cycles on the softening index of cured Yellow River silt samples was ana-lyzed.The results show that the disintegration process of the Yellow River silt sample solidified by EICP technology is slower than that of the original sample.The Yellow River silt samples with cement concentration C=1.5 mol/L re-mained almost intact after long-term(56 d)water immersion,with mass and strength loss rates of only 6.36％and 6.21％,respectively.After 10 dry-wet cycles,the Yellow River silt samples with different cement concentrations showed different degrees of particle loosening and shedding.The loss of compressive strength of the Yellow River silt sample with cement concentration C=1.5 mol/L and grouting times N=10 was only 9.96％,and the resistance to wet-dry cycles was the strongest.By using EICP technology,the Yellow River silt can be effectively solidified and its water stability can be improved,which is very important for promoting the process of resource utilization of the Yellow River silt.
Yellow River siltEICPdry-wet cyclesmass lossstrength losssoftening index
万方数据
维普
