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| Citation: | Jia Zhibo, Tao Lianjin, Bian Jin, Wen Hu, Zhang Haixiang, Wang Zhigang, 2022. Displacement Analysis of Slope Reinforced by Pile-Anchor Composite Structure under Seismic Loads. Earth Science, 47(12): 4513-4522. doi: 10.3799/dqkx.2022.278
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The anti-sliding force provided by the reinforcement structure is often simplified to a constant value, which cannot reflect the change in the earthquake. To accurately evaluate the stability of the slope, the nonlinear mechanical model is introduced. Combined with the newmark method, the real-time update of the anti-sliding force is realized. The effect of vertical seismic loads on the slope is also considered. The calculation formulas of safety factor and displacement are deduced. Besides, the effect of structural coefficient changes on the results is discussed. The research shows follows: (1) After introducing the exponential nonlinear model, the anti-sliding forces show time effects and increase with earthquakes. (2) The anchor cable force at the initial stage of the earthquake is equal to the pre-tension force, and the stabilizing pile has no anti-sliding effect. As the slope slides, the force of the stabilizing pile grows rapidly and eventually dominates. (3) Equating the anti-sliding force of the structure as a fixed value simplifies the calculation, but the risk of slope instability is underestimated. In the reinforcement design, the deformation of the reinforcement structure should be considered.
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