可调索力锚拉桩在深厚土层边坡治理设计中的应用研究

Application of Anchorage Piles with Adjustable Cable Force in Deep Soil Slope Treatment and Design

预应力锚拉抗滑桩因其能改善桩的受力特性,控制桩顶位移,降低工程造价等诸多优点,在大型边坡治理中得到广泛应用。然而因预应力损失量大,蠕变稳定时间长等缺点,在深厚土层边坡治理工程中往往效果并不理想。鉴于此,引入一种可调索力锚固装置,通过事后补偿张拉控制锚索拉力,进而保证锚拉桩的加固效果。将该装置应用于某高速公路边坡治理设计,结果表明,后期预应力补偿张拉,可挽回25%~45%的预应力损失,桩顶位移减少50%~60%,大幅度提高了抗滑桩的治理效果。

Prestressed anchorage anti-slide piles are widely used in large-scale slope treatment because of their ability to improve the pile＇s force characteristics, control pile top displacement and reduce project cost. However, due to the large amount of prestressed loss and long creep lasting time, it is often not effective in the deep soil slope treatment project. In view of that, an anchorage device with adjustable cable force was introduced, in which the cable force was controlled through the post-compensation tension and then to ensure the reinforcement effect of anchorage pile. The device was applied to a highway slope treatment design and the results show that the post-prestressed compensatory tension can recover 25 % - 45 % of the prestress loss and reduce the displacement of the pile top by 50 % - 60 %. The treatment effect of slope was significantly improved by the anchorage device with adjustable cable force.