锚拉桩-锚索框架梁组合结构加固边坡可视化模型试验

Visual Modeling Experiment of Soil Slopes Stabilized with Anchored Piles and Anchor Cable Frame Beams

基于透明土技术开展锚拉桩-锚索框架梁组合结构加固边坡的可视化模型试验,并结合粒子图像测速技术,展现坡顶条形荷载作用下边坡的位移场演化及滑移破坏过程。研究结果表明:锚拉桩-锚索框架梁组合结构加固边坡较无加固边坡,其极限承载力大幅提升,其滑面较无加固边坡的滑面加深很多。锚拉桩-锚索框架梁组合结构加固推移式滑坡时,其受力机制为最上面的锚索首先发挥作用,在其拔出失效后,后面的锚索依次发挥作用直至拔出失效,同时边坡的稳定性逐步降低。目前基于极限平衡理论将所有锚索的极限抗拔力作为抗滑力分量计算得到的锚拉桩-锚索框架梁组合结构的稳定性偏于危险。建议验算锚拉桩-锚索框架梁组合结构加固推移式滑坡整体稳定性时,同时验算最上面锚索的稳定安全系数,使其满足工程所需的安全系数,由此保证整个加固边坡的稳定性。

A series of visual modeling experiments of soil slopes stabilized with anchored piles and anchor cable frame beams were conducted based on the transparent soil technology.Particle image velocimetry(PIV)was employed to investigate the displacement fields and failure processes of slopes at bar loading.The results show that anchored piles and anchor cable frame beams can enhance the ultimate bearing capacity of slopes.Its slip surface is deeper than that of an unreinforced slope.For the reinforcement of pushed landslides,the upper anchor cable works first.After it has been pulled out,the anchor cables that followed in turn exert effect until being pulled out.The stability of slopes stabilized with anchored piles and anchor frame beams is not conservative when the ultimate pullout resistance of all anchor cables is considered simultaneously as a component of the slip resistance.It is suggested that when checking the overall stability of the pushed landslide stabilized with anchored piles and anchor cable frame beams,the factor of safety of the uppermost anchor cable should be checked simultaneously to make it meet the factor of safety required by the project,thus ensuring the stability of the whole reinforced slope.