滑坡体预应力锚索抗滑桩参数优化设计研究

Study on parameter optimization design of anti-slide piles with pre-stressed anchor cable for landslide mass

依托青峪口水库上游草池滑坡体,采用有限差分法分析不同状态下的滑坡体变形和受力分布,进行预应力锚索抗滑桩参数优化设计。结果表明:桩位对滑坡体稳定性的影响较大,随着桩位与坡脚距离的增大,滑坡体安全系数先增大后减小;同一桩位下,抗滑桩锚固段存在临界长度,为30 m;抗滑桩桩距对滑坡体稳定性的影响比桩截面尺寸的影响大;在26°~35°范围内的锚索角度对滑坡体稳定性的影响较小。建议抗滑桩截面尺寸、桩距、锚索角度分别取2.5 m×3.5 m、7 m和27°。

Based on the Caochi landslide mass in the upstream of the Qingyukou Reservoir,the finite difference method for parameter optimization design of anti-slide piles with pre-stressed anchor cable was used to analyze the deformation and force distribution of the landslide under different states.The results show that the pile position has a great influence on the stability of the landslide mass,and the safety factor of the landslide stability increases and then decreases with the distance between the pile position and the slope toe.Under the same pile position,there exists a critical length of the anchorage section of the anti-sliding pile,which is 30 m.The influence of the pile spacing on the stability of landslide mass is greater than the section size of anti-slide pile.In the range of 26°to 35°,the angle of anchor cable has little effect on the landslide stability.Through comprehensive analysis,it is suggested that the section size,pile spacing and anchor cable angle of the anti-slide pile should be 2.5 m×3.5 m,7 m and 27°,respectively.