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| Experimental study on unsaturated flow properties through a single limestone fracture under confining pressure |
| HU Yunjin1，2，3，YANG Shendong1，2，3，ZHONG Zhen1，2，3，WANG Xiaoyu1，2，3，ZHANG Tuowei4，ZHOU Rujie1，2，3 |
| (1. Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province，Shaoxing，Zhejiang 312000，China；2. School of Civil Engineering，Shaoxing University，Shaoxing，Zhejiang 312000，China；3. Zhejiang Collaborative Innovation Center for Prevention and Control of Mountain Geologic Hazards，Shaoxing，Zhejiang 312000，China；4. The Eleventh Geological Brigade of Zhejiang Province，Wenzhou，Zhejiang 325000，China) |
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Abstract In order to investigate the properties and influencing factors of unsaturated flow through a single rock fracture under different confining stress，unsaturated flow experiments are performed on four single limestone fractures under various saturations and confining pressures by use of the self-developed rock fracture unsaturated flow test system. The experimental results show that：(1) With the increase of confining pressure，the air entry pressure increases，and the decline slope and amplitude of unsaturated permeability coefficient and capillary pressure relationship curve decrease. Under the same capillary pressure, the fracture unsaturated permeability coefficient corresponding to high confining pressure is higher than that under low confining pressure. (2) By comparing the effects of capillary pressure and confining pressure on unsaturated permeability coefficient，it is found that the effect of confining pressure on unsaturated permeability coefficient decreases with the increase of capillary pressure. Similarly，with the increase of confining pressure，the effect of capillary pressure on unsaturated permeability decreases. (3) With the increase of roughness，the fracture saturated permeability coefficient decreases and the residual saturation increases slightly. (4) Based on the fracture unsaturated flow test data under different confining pressures and capillary pressures，the relationship between fracture unsaturated permeability coefficient and capillary pressure and confining pressure is fitted. From the comparison between the fitting surface and the test data, the fitting relationship can accurately describe the change of fracture unsaturated permeability coefficient with capillary pressure and confining pressure. The research results on the process and law of unsaturated flow in fractures under variable stress can provide a basis for the stability analysis of engineering rock mass under the condition of rainfall infiltration.
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2022, Vol. 41 
