覆盖层滑坡斜向锚固桩加固效果研究

Research on the Reinforcement Effect of Inclined Anchor Pile for Overburden Landslide

研究目的:通过数值模拟研究斜向锚固桩加固覆盖层滑坡的效果,探讨覆盖层滑坡滑面、滑体及滑床强度指标对斜向锚固桩加固效果的影响,分析斜向锚固桩最优锚固角和最优加固效果预测方法。着重通过比较斜向锚固桩与竖直桩加固滑坡后的稳定系数,对比斜向锚固桩和竖直桩的加固效果。研究结论:(1)斜向锚固桩加固覆盖层滑坡的效果一般都优于竖直桩,锚固角选择合适时,同等条件下可将滑坡稳定系数提高5.44%~21.38%;(2)滑面强度指标越低、滑体强度指标越高,斜向锚固桩的加固优势越明显;(3)对于本文算例,平均最优锚固角为27.5°,桩轴线与滑面大致垂直时,斜向锚固桩的加固效果最好;(4)建立了斜向锚固桩加固效果的拟合预测计算公式,已知滑面、滑体的强度指标,就可初步估算斜向锚固桩的加固效果;(5)本研究结论对滑坡治理工程的设计有参考价值。

Research purposes:Through numerical simulation,this paper studies the effect of reinforcement of overburden landslide by inclined anchor piles,discusses the influence of strength indexes of slide surface,slide body and slide bed on the reinforcement effect of inclined anchor piles,analyzes the optimal anchoring angle and the prediction method for reinforcement effect of inclined anchor piles.By comparing the stability coefficient of inclined anchor pile and vertical pile after strengthening landslide,the reinforcement effect of inclined anchor pile and vertical pile is compared mainly.Research conclusions:(1)For overburden landslide treatment,the reinforcement effect of the inclined anchor pile is generally better than that of the vertical pile.When the anchor angle of the inclined anchor pile is selected properly,the stability coefficient of the landslide can be increased by 5.44%~21.38%under the same conditions.(2)The lower the strength index of the sliding surface and the higher the strength index of the sliding body,the more obvious the reinforcement advantage of the inclined anchor pile is.(3)For the calculation example in this paper,the average optimal anchoring angle is 27.5°and when the axis of the pile is approximately perpendicular to the sliding surface,the reinforcement effect of the inclined anchor pile is the best.(4)The prediction calculation formula of the reinforcement effect of the inclined anchor pile is established.Given the strength index of sliding surface and sliding body,the reinforcement effect of inclined anchor pile can be estimated preliminarily.(5)The research conclusion has a good reference value for the design of landslide control engineering.