抗滑桩在岸坡滑坡治理中的受力特征研究

Study on Stress Characteristics of the Anti-Sliding Pile in Bank Slope Landslide Treatment

抗滑桩+土层锚杆+护脚墙是边坡加固的有效措施,抗滑桩受力及变形特征决定着其加固效果。基于长江某库岸边坡治理工程,采用GTS NX有限元软件建立含“抗滑桩+土层锚杆+护脚墙”加固措施的边坡稳定性三维计算模型,分析了不同水位工况下边坡的稳定性情况和抗滑桩的受力及变形特征。结果表明,高水位(175 m)工况时,坡体受库水浮托作用影响稳定性最差、水平位移最大(达0.14 m),其潜在破坏面易出现在边坡中部;低水位(145 m)及高水位降至低水位工况时,库水浮托作用对坡体抗滑力影响减弱,边坡位移及剪应变均明显降低,且集中在边坡上部和中部。受上部坡体变形影响,抗滑桩在超过14 m桩长部分的位移值随桩长呈近线性增加,且高水位工况时抗滑桩的水平位移、剪力和弯矩最大,达14.2 mm、11040 kN和55920 kN·m。

Anti-sliding pile plus soil anchor plus toe wall is an effective measure for slope reinforcement.The stress and deformation characteristics of anti-sliding pile determine its reinforcement effect.Based on the slope treatment project of a reservoir bank in the Yangtze River,this paper establishes a three-dimensional calculation model of slope stability with“anti-sliding pile plus soil anchor plus toe wall”reinforcement measure by using GTS NX finite element software,and analyzes the stability of the slope and the stress and deformation characteristics of anti-sliding pile under different water level conditions.The results show that under the condition of high water level(175 m),the slope has the worst stability and the largest horizontal displacement(up to 0.14 m),and its potential failure surface is likely to appear in the middle of the slope.Under the conditions of the low water level(145 m)or the high water level drops to the low water level,the influence of reservoir water floating on the anti-sliding force of the slope is weakened,and the slope displacement and shear strain are significantly reduced which are concentrated in the upper and middle of the slope.Due to the deformation of the upper slope,the displacement of the anti-sliding pile over the pile length of 14m increases nearly linearly with the pile length.Under the condition of high-water level,the horizontal displacement,shear force and bending moment of the anti-sliding pile are the largest,which are up to 14.2 mm,11040 kN and 55920 kN·m respectively.