脱湿路径下考虑干湿循环和体变影响的膨胀土土水特征

doi:10.13722/j.cnki.jrme.2021.1097

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Abstract A set of dehydration tests of weakly expansive soils experienced different drying and wetting cycles were carried out by using the improved true triaxial apparatus for unsaturated soil to investigate the influence of drying and wetting cycle and volume change on soil water characteristic curve of expansive soil，and the water content and void ratio after each stage of dehydration were measured. The results show that with the increase of drying and wetting cycle，the pore ratio increases after saturation and decreases after dehumidification. The water content and void ratio of expansive soils after drying and wetting decrease with an increase in suction. Under the increasing of matric suction，the curves of the water content and the degree saturation with suction appear cross phenomenon，and the void ratio and suction curves appear cross-convergence phenomenon. With the increase of drying and wetting cycle，the volumetric moisture content and degree of saturation of expansive soils after dehydration decrease，which reflects the coupling effect of soil water characteristics and volume change of expansive soils after drying and wetting cycles. Based on Fredlund-Xing model，a SWCC equation expressed by the water content considering the influence of drying and wetting cycle is constructed，and the volume change equation of expansive soils considering the influence of drying and wetting cycles is established. Finally，the SWCC equation expressed in degree of saturation considering the effects of drying and wetting cycles and volume change is obtained. These three models can well describe the change rules of the water content，the void ratio and the degree of saturation of expansive soils after different drying and wetting cycles.

Key words： soil mechanics dehydration drying and wetting cycles volume change soil water characteristics true triaxial apparatus

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	Articles by authors
	FANG Jinjin1
	XUE Tongxing1
	YANG Xiaolin1
	YU Jianxin1
	ZHANG Jun1
	FENG Yixin2

Cite this article:

FANG Jinjin1,XUE Tongxing1,YANG Xiaolin1, et al. Soil water characteristics of expansive soil considering the effects of drying and wetting cycles and volume change under dehydration path[J]. , 2022, 41(8): 1671-1679.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1097 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I8/1671

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