抗滑桩加固不同坡率边坡的效果及机理分析

Analysis of the Effect and Mechanism of Anti-Slide Piles in Strengthening Slopes with Different Gradients

针对不同坡率边坡,采用ABAQUS软件对抗滑桩加固边坡前后的稳定性进行强度折减有限元分析。基于边坡安全系数和桩身弯矩讨论不同坡率下的最优桩位,并结合增量位移云图分析最优桩位下不同桩长、桩间距、桩截面尺寸对边坡稳定性的影响。分析结果表明:最优桩位受坡率影响显著,随坡率增大有向坡中移动趋势,坡率1∶2时,最优桩位在L_(x)/L=0.8处;坡率1∶1和2∶1时,最优桩位在L_(x)/L=0.6处。坡率1∶2、1∶1和2∶1对应的安全系数分别为1.581、1.171、0.980,相较于无桩时提高约10%、17%、40%,增幅逐渐增大,可见坡率越大抗滑桩取得的加固效果越好;安全系数随着桩长的增长先增大后趋于稳定,坡率越大趋于稳定值越快;随着桩间距的增加而减小,坡率越大减小速率越大;随着桩截面尺寸的增大先增大后趋于稳定,坡率越大趋于稳定值越早。

For slopes with varying gradients,this work conducted strength reduction finite element analysis on the stability of slopes before and after the application of anti-slide pile reinforcement using the software ABAQUS.Considering the safety factor of the slope and the bending moment of the pile,the optimal pile position for different gradients was discussed.Additionally,with the aid of incremental displacement diagrams,the impact of different pile lengths,spacing,and cross-sectional dimensions on slope stability at the optimal pile position was analyzed.Results indicate a significant correlation between slope gradient and the optimal pile position,which tends to shift toward the slope center as the gradient increases.Specifically,for a gradient of 1∶2,the optimal pile position is at L_(x)/L=0.8;for gradients of 1∶1 and 2∶1,it is at L_(x)/L=0.6.The safety factors for gradients of 1∶2,1∶1 and 2∶1 are 1.581,1.171 and 0.980,respectively,which are about 10%,17%and 40%higher than those without piles,and the increase displays a gradually increasing trend.It shows that the larger the gradient,the better the reinforcement effect of anti-slide piles.The safety factor initially rises with an increase in pile length and later stabilizes,with this stabilization occurring faster at steeper gradients.As pile spacing increases,the safety factor reduces,with this reduction being more pronounced at steeper gradients.As the pile cross-sectional dimension grows,the safety factor first rises then levels off,and this leveling off occurs sooner with steeper gradients.