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| Anisotropy of argillaceous slate swelling evolution in water-rich environment |
| ZUO Qingjun1，2，LI Zhaoming1，2，ZHANG Zhongjun3，TANG Luosheng4，LI Pan1，2，HAN Bingxiao1，2，LI Xinyi1，2 |
| (1. National Field Observation and Research Station of Landslides in Three Gorges Reservoir Area of Yangtze River，China Three Gorges University，Yichang，Hubei 443002，China；2. College of Civil Engineering and Architecture，China Three Gorges University，Yichang，Hubei 443002，China；3. The Seventh Geological Brigade of Hubei Geological Bureau，Yichang，Hubei 443100，China；4. Hubei Provincial Communications Planning and Design Institute Co.，Ltd.，Wuhan，Hubei 430051，China) |
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Abstract In order to study the anisotropic characteristics of argillaceous slate with structural planes during swelling in water-rich environment，the remolded argillaceous slate samples with different dips of structural planes were prepared to carry out swelling characteristics test，nuclear magnetic resonance test and scanning electron microscope test to analyze the macroscopic evolution law and microstructure change characteristics of argillaceous slate swelling anisotropy. Based on the tests results，the three-dimensional swelling constitutive model and the meso expression of swelling stress of argillaceous slate with structural plane dig are established. The results show that under the influence of the dip of the structural plane in water-rich environment，the swelling rate-swelling load of remolded argillaceous slate shows a nonlinear relationship，which is consistent with the natural argillaceous slate. Under the same axial load，the axial limit swelling rate is negatively correlated with the dip of the structural plane. Due to the structural planes with different dips，argillaceous slate?s lateral limit swelling ratio and the axial limit swelling stress under constant volume show obvious anisotropy，which are negatively correlated with the dip of structural plane. The pores of argillaceous slate after swelling are mainly small and medium pores；The microscopic basic unit of argillaceous slate is mainly composed of flake particles，and the part of the particles is massive particles. The orientation of spatial arrangement of particles is obvious. The contact mode between particles is mainly surface-surface contact and they are stacked in tower shape. With the increase of dip of structural plane，the number of pores，pore area and surface porosity gradually decrease，and the edge of pores tends to be complicated. The three-dimensional swelling constitutive model and meso expression of swelling stress of argillaceous slate with structural plane dip quantitatively characterize the anisotropic characteristics of swelling evolution of argillaceous slate in water-rich environment from macro-meso-micro scale. The research results can provide reference for the study of soft rock swelling mechanism and the treatment of soft rock swelling problem.
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2022, Vol. 41 
