原状膨胀土的三向膨胀力变化特性

doi:10.13722/j.cnki.jrme.2022.0277

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Abstract Under the condition of measuring suction，a series of three-dimensional swelling pressure tests，three-dimensional swelling pressure tests for controlling vertical deformation and three-dimensional swelling pressure tests of expansive soils after drying-wetting cycle were carried out on intact expansive soils by using an improved unsaturated soil true triaxial apparatus to investigate the variation characteristics of three-dimensional swelling pressure. The effects of matric suction，vertical deformation and drying-wetting cycle on the three-dimensional swelling pressure were studied. The results show that three-dimensional swelling pressure increases with a decrease in suction and gradually stabilizes. In this process，there is an obvious critical suction value ，and which increases with an increase in initial suction. When ，the growth rate of three-dimensional swelling pressures and the decrease speed of suction are faster，when ，the growth rate of three-dimensional swelling pressures and the decrease speed of suction are slower. Three-dimensional limit swelling pressures increase with an increase in initial suction，and the vertical limit swelling pressure increases faster with the initial suction. The small change of vertical strain will lead to the rapid decrease of three-dimensional swelling pressures. With the continuous development of vertical strain，the three-dimensional swelling pressures gradually decrease and tend to be stable. Under different vertical strain conditions，there is no significant difference in the attenuation of the two horizontal swelling pressures，but the attenuation of the vertical swelling pressure is always larger than that of the horizontal swelling pressures. When the vertical strain is constant，as the initial suction increases，the attenuation of the three-directional swelling pressures increase. After drying-wetting cycles，the moisture content and suction of expansive soils decrease with an increase in the number of cycles，and the three-dimensional limit swelling pressures of intact expansive soils increase with an increase in the number of drying-wetting cycles.

Key words： soil mechanics expansive soil true triaxial apparatus for unsaturated soil swelling pressure drying-wetting cycle

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	Articles by authors
	FANG Jinjin1
	YANG Xiaolin1
	FENG Yixin2

Cite this article:

FANG Jinjin1,YANG Xiaolin1,FENG Yixin2. Variation characteristics of three-dimensional swelling pressure of intact expansive soils[J]. , 2023, 42(S1): 3722-3730.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0277 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3722

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