Abstract：Research purposes: Groundwater continuously invades the roadbed under the capillary action, which will lead to frost heave, salt heave and other diseases of the roadbed in severe cases, and the capillary rise height will be affected by soil density, initial moisture content, salt type and salt content. By mixing pure quartz sand with different types and contents of salt, the capillary water rise height test is carried out in this research. The capillary test results under different particle size gradations and initial moisture content are compared and analyzed, and the prediction equation of rising height is fitted. Research conclusions: (1) The stable height of capillary rise increases with the decrease of particle size. Under the condition of good gradation, the change of fine particle size content has a significant effect on the rate of capillary rise. (2) Within 4 000 min, the capillary rising speed will increase when NaCl and Na2SO4 are added into quartz sand. (3) The addition of two salts will reduce the final capillary rise height, but NaCl has little effect. (4) The research result can provide support for controlling capillary rise and dealing with salt heave, frost heave and other diseases.
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2022, Vol. 39 
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