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Failure mechanism of short fiber-reinforced cement-stabilized silty clay depends on the in-teraction between the fiber and the cement-stabilized soil matrix. And the mechanism of fiber reinforce-ment is revealed by experimental studies and numerical simulations. Firstly, by using the single fiber pull-out test, the results show that the maximum tensile force of single fiber under different embedding lengths increases with the development of age. Then based on cohesive model, a three-dimensional finite element method model is established to simulate the interaction between single fiber and cement-stabilized soil. The comparisons of theoretical results, numerical results and experimental results reflect that viscous in-terface parameters have vital effects on the interaction between single fiber and cement-stabilized matrix. Introducing the proper cohesive model, numerical results agree well with the experimental results better.