非饱和重塑弱膨胀土孔隙结构与土–水特征曲线试验研究

doi:10.13722/j.cnki.jrme.2021.0277

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Abstract To study the effect of compaction degree on the pore structure of unsaturated remolded weak expansive soil，and to investigate the influence of the change of pore structure of expansive soil on the soil-water characteristic curve(SWCC). Taking the remolded expansive soil in Hami of Xinjiang as the research object，the mercury intrusion test was used to determine the impact of compaction on the microscopic pore structure of the soil sample，and use the thermodynamic relationship model to study the fractal dimension of expansive soil. The pressure plate instrument and filter paper method were used to test the soil of the remodeled soil sample under different dry densities-water characteristic curve. The expansive soil SWCC two-parameter fitting model that can consider the effects of compaction is proposed. Finally，based on the pore characteristics of the mercury intrusion test，the soil-water characteristic curve is corrected with the help of the capillary principle to calculate and combine the test data of the filter paper method. The results show that as the degree of compaction increases，the pore distribution curve of expansive soil presents an initial Trimodal distribution and gradually tends to be bimodal. The compaction effect is manifested in the microscopically as the conversion of large pores to small pores caused by the compression of large pores. The fractal characteristics of pores show that compaction has increased the roughness of the inner wall of the pore and the complexity of the pore structure. The suction of the soil matrix decreases with the increase of water content. Under the same volumetric water content，the greater the initial dry density of the soil，the greater the suction of the matrix. The two-parameter model can better reflect the influence of the initial dry density of the soil on the development law of the soil-water characteristic curve of the expansive soil. The calculated value of the soil-water characteristic curve based on the capillary principle has the same function model development law as the actual measured curve of the filter paper method，and the two tend to gradually“far away”as the initial dry density of the sample increases. The modified soil-water characteristic curve model can uniformly describe the development law of the matrix suction of the unsaturated weakly expansive soil with the pore structure，water content and density state.

Key words： soil mechanics unsaturated expansive soil mercury intrusion porosimetry filter paper method microscopic pore structure soil-water characteristic curve

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	Articles by authors
	DING Xiaogang1
	MA Lina1
	2
	LIN Wenbo1
	JIN Yirui1
	LI Yuechao1
	WANG Zhiqiang1

Cite this article:

DING Xiaogang1,MA Lina1,2, et al. Experimental study on the pore structure and soil-water characteristic curve of unsaturated remolded weak expansive soil[J]. , 2022, 41(S1): 3081-3090.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0277 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/3081

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