Numerical Simulation of Lifting Capacity of Power Transmission Tower Micropiles in Peat Frozen Soil Region

There are few researches on the uplift performance of transmission tower micropile foundation in peat frozen soil. Based on the soil parameters obtained in the test, FLAC
^3D
was used to simulate and analyze the uplift characteristics of different expanding types, expanding ratios and expanding lengths during freezing and melting periods. The results show that the load-displacement curve of the pile conforms to the slowly becoming nonlinear curve, and the uplift performance of the pile with expanded bottom is stronger than that of the other two foundation types. The uplift performance of the pile can be improved by increasing the expansion ratio. The expansion length does not significantly improve the uplift performance of pile, and the tilt Angle of 12° is the critical value of the influence between anchorage length and bottom expansion Angle.