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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摘要为研究原状膨胀土三向膨胀力的变化特性，在测量吸力条件下，利用改进的非饱和土真三轴仪对原状膨胀土进行三向膨胀力试验、控制竖向变形的三向膨胀力试验和干湿循环后膨胀土的三向膨胀力试验，研究基质吸力、竖向变形和干湿循环对三向膨胀力的影响。研究结果表明：原状膨胀土的三向膨胀力随着吸力的减小而增大并逐渐趋于稳定，在此过程中存在一个明显的临界吸力值，其值随着初始吸力的增大而增大；当吸力时，三向膨胀力的增长速度和吸力减小的速度较快，当时，三向膨胀力的增长速度和吸力减小的速度较慢；三向极限膨胀力随着初始吸力的增大而增大，竖向极限膨胀力随初始吸力增大的速度较快；竖向应变的微小变化就会导致三向膨胀力的快速减小，随着竖向应变的继续发展，三向膨胀力逐渐减小并趋于稳定；在不同的竖向应变条件下，2个水平膨胀力的衰减量相差不大，而竖向膨胀力的衰减量始终大于水平膨胀力的衰减量；竖向应变一定时，随着初始吸力的增大，三向膨胀力的衰减量增大；干湿循环后膨胀土的含水率和吸力均随着循环次数的增加而减小；随着干湿循环次数的增加，该原状膨胀土的三向极限膨胀力增大。

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	方瑾瑾1
	杨小林1
	冯以鑫2

关键词 ：土力学, 膨胀土, 非饱和土真三轴仪, 膨胀力, 干湿循环

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

引用本文:

方瑾瑾1，杨小林1，冯以鑫2. 原状膨胀土的三向膨胀力变化特性[J]. 岩石力学与工程学报, 2023, 42(S1): 3722-3730.
FANG Jinjin1，YANG Xiaolin1，FENG Yixin2. Variation characteristics of three-dimensional swelling pressure of intact expansive soils. , 2023, 42(S1): 3722-3730.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0277 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3722

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