盐渍土基泡沫轻质土工程特性试验研究

doi:10.3724/1000-6915.jrme.2023.1098

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Abstract Saline soil is widely distributed in Xinjiang area，where using saline soil as foamed lightweight soil in subgrade backfill can effectively utilize excavated waste soil，and improve the durability of subgrade in Xinjiang cold and dry area due to the good thermal insulation performance. From this perspective，the influence of density，soil content and water to dry-material ratio on engineering characteristics of saline soil-based foam lightweight soil was studied in this paper. Firstly，a series of tests were conducted to compare the thermal conductivity，fluidity，water absorption and stability of different ratios. Secondly，the unconfined compressive strength of samples under various conditions(e.g.，freeze-thaw cycle and dry-wet cycle) was obtained，in which the mechanical properties index and energy absorption rate were also studied. Finally，the pore microstructure of foamed lightweight soil was deeply analyzed by SEM and image processing software. The experimental results show that moisture and foam content greatly affect the fluidity of foamed lightweight soil. The water absorption decreases gradually with the increase in density. The foamed lightweight soil presents good thermal insulation performance. In detail，the thermal conductivity is about 1/6‐1/10 of the ordinary compacted soil. Also，there is a well-linear relationship between the density and the thermal conductivity. Under the freeze-thaw cycles，dry-wet cycles and immersed water conditions，the unconfined compressive strength of the samples decreases by 40%‐50%. Regarding microstructure characteristics，the number and roundness of pores increased with the increase in density. The structure of pores can serve as a“bridge”to establish a connection between its microstructure and macroscopic mechanical properties. In the study，it is recommended that the density of 800‐1 200 kg/m3，the salt soil content is not more than 40%，and the water-material ratio is 0.45‐0.55 can be regarded as the optimum ratio. The unconfined compressive strength of the described above ratio is about 0.6‐1.0 MPa，meeting the requirement of subgrade strength，thermal insulation，and durability.

Key words： soil mechanics foamed lightweight soil physical properties mechanical properties microstructure

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	Articles by authors
	LU Zheng1
	2
	ZHANG Rong1
	3
	ZHAO Yang1
	QIN Lang4
	LIU Jie5
	YAN Tingzhou6
	LI Jian6
	LI Bingwei7
	ZHANG Jing8

Cite this article:

LU Zheng1,2,ZHANG Rong1, et al. Experimental study on engineering characteristics of foamed lightweight soil based on saline soil[J]. , 2025, 44(S1): 206-218.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2023.1098 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/IS1/206

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