Mechanical properties of improved carbonate soil roadbed filler

Abstract:

For the carbonate soil in the western part of Jilin province, considering different methods of modifying soil using lime and lime + fly ash, the engineering and strength characteristics of carbonate soil improved by lime and lime + fly ash were studied via limit moisture content test, compaction test, and triaxial shear test. Combined with the analysis of consolidation compression test, the deformation characteristics of the improved saline soil were discussed. Results show that the lime and lime + fly ash modifiers could effectively improve the plasticity and compaction characteristics of the carbonate soil. With the addition of lime and lime + fly ash modifiers to the carbonate soil, the shear strength of the improved soil was increased. When the dosage reached 9%, the strength of lime-modified soil decreased, while the strength of the soil modified by lime + fly ash varied with different salt contents, resulting in different improvement effects. The improved saline soil transformed from medium compressive soil into low compressive soil. With the increase in the maintenance age, the compressive deformation of the soil decreased. The compressibility of the saline soil could reach the best by adding a reasonable amount of modifier.