Experimental Study on the Compressive Strength of Improved Silt in Yellow Flooded Area

May 26, 2020    Author

The poor particle gradation of the silt in the yellow flooding area results in low soil strength. The silt in the yellow flooding area is improved, and the silt is reinforced with lignin to analyze the unconfined compressive resistance of the silt after lignin improvement The relationship between the strength and the amount of lignin, the number of freeze-thaw cycles and the curing age. Under the condition of controlling the moisture content of the sample, the unconfined compressive strength test and freeze-thaw cycle test of the lignin modified soil .

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Figure 1. (a) Lignin and aqueous solution used for improving soil; (b) Test the physical and mechanical properties of silt

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Figure 2. (a) Relationship between lignin content and unconfined compressive strength of silt; (b) Stress-strain relationship of lignin-improved soil

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Figure 3. (a) The effect of curing age on the strength of improved soil; (b)The influence of freeze-thaw cycles on the strength of improved soil

The experimental results show that lignin can increase the unconfined compressive strength of silt soil. Under a certain number of freeze-thaw cycles, the unconfined compressive strength of lignin-improved soil first increases and then decreases with the increase of the content. The unconfined compressive strength of the modified soil increases with the increase of age, and the unconfined compressive strength of the modified soil gradually decreases with the increase of the number of freeze-thaw cycles.

Research Publish:

[1] Zhang Jianwei, Kang Feixiang, Bian Hanliang, Yu Hang. Experimental study on unconfined compressive strength of silt in yellow flooded area improved by lignin under freeze-thaw cycles[J]. Rock and Soil Mechanics, 2020, 08(supp2):1 -5.