不同湿密状态及试验路径下膨胀土的侧向土压力及孔隙结构特征

doi:10.3724/1000-6915.jrme.2024.0835

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Abstract To investigate the effects of initial moisture-density conditions and testing paths on the lateral earth pressure and pore structure of expansive soils during soaking, this paper measures the relationships among void ratio, lateral earth pressure, and vertical stress ( ) of Ningming expansive soil specimens compacted at five different initial moisture-dry density (w， ) conditions under the at-rest condition. The constant volume path (CV), swelling-under-load path (SUL), and swell-consolidation path (SC) were followed during the tests, and the characteristics of the pore structure were also obtained. The results show that: (1) the CV path is a specific case of the SUL path. The and relationships derived from the SC and SUL paths are multi-linear and become consistent when the vertical stress exceeds 400 kPa. Below 400 kPa, the slopes of the relationships from the SUL and SC paths are comparable; (2) the swelling potential of the expansive soil decreases nonlinearly with increasing compaction moisture content w, with a more significant reduction observed in the higher w range. The swelling and consolidation indices are not sensitive to the while the swelling stresses increase significantly with the ; (3) as the increases, the micropores of the SC path and the macropores of the SUL path continually decrease. The micropores of the SUL path and the macropores of the SC path decrease when ( is the initial void ratio before soaking). They become insensitive to when . With , comparing with the SUL path, the macropores of the SC path are easier to compress while the micropores of the SC path are harder to compress, at = 700 kPa where consolidate domains. The pore structures of the specimens with SC and SUL paths are similar.

Key words： soil mechanics expansive soil lateral earth pressure pore structure testing path compaction water content

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	Articles by authors
	HAN Zhong1
	WU Erxun1
	ZOU Weilie1
	SHEN Xizhong2
	WANG Xiequn3

Cite this article:

HAN Zhong1,WU Erxun1,ZOU Weilie1, et al. Lateral earth pressure and pore structure of expansive soil with different initial moisture-density conditions and testing paths[J]. , 2025, 44(8): 2191-2201.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0835 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I8/2191

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