Study on strength characteristics and water stability of lime-polypropylene fiber modified saline soil under immersion environment
In order to investigate the strength characteristics and water stability of lime-polypropylene fiber modi-fied saline soil under immersion environment,the compressive strength and volume expansion rate of the modi-fied soils under different immersion days were studied by indoor tests and the response surface methodology was used to optimize the soil improvement process.The results show that lime and fiber can effectively improve the compressive strength and water stability of the modified soil under immersion environment,and the optimal lime content and the optimal fiber content are 8%and 0.4%,respectively.The compressive strength and water stabili-ty of the modified soil can also be effectively improved by controlling the salt content in the soil and the propor-tion of Na2SO4 in the salt,and the optimal salt content and the optimal proportion of Na2SO4 are 1%and 25%,re-spectively.With the increase of immersion days,the compressive strength of the modified soil shows a tendency to decrease significantly and then increase slowly,while the volume expansion rate shows a tendency to increase gradually and then level off.After response surface optimization,the maximum compressive strength of the modified soil is 602.542 kPa,and the optimal test variable combination corresponding to it is:lime content 7.41%,fiber content 0.38%,salt content 1.27%,and the proportion of Na2SO4 in salt 24.91%;the minimum volume expansion rate is 0.288%,and the optimal test variable combination corresponding to it is:lime content 6.53%,fiber content 0.38%,salt content 1.21%,and the proportion of Na2SO4 in salt 29.92%.The research results can provide theoretical basis and parameter support for engineering construction in saline soil areas,and realize the purpose of resource utilization of saline soil.
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