关键词: 边坡, 长期稳定性, 锚索加固, 预应力损失, 安全系数

Abstract: In actual project, slope’s long-term stability problem is caused by the loss of pre-stress of anchorage cable acting on the slope due to the creep properties of geotechnical body. To correctly estimate the long-term stability of slope reinforced with pre-stressed anchorage cable, a limit equilibrium calculation method is proposed to analyze slope stability based on the assumption of stresses on the slip surface and by integrating the model of anchorage pre-stress loss. By using this method, the factor of safety of slope reinforced with pre-stressed anchorage cable in different periods are obtained, thus the dynamic change of slope stability can be reflected. By analyzing engineering examples, the feasibility of the method is verified, and the notion that pre-stress loss of anchorage cable worsens the long-term stability of slope is proved. Moreover, parametric analysis on the influence of pre-stress loss of anchorage cable on slope’s long-term stability indicates that increasing the initial pre-stress of anchorage cable is reliable and effective to improving the long-term stability of slope.

Key words: slope, long-term stability, anchorage cable, pre-stress loss, factor of safety