坡地填方边坡三排阶梯形抗滑桩数值模拟

Numerical Simulations on Three Rows of Stepped Anti-Slide Piles Against Filling Slopes on Hillsides

针对新型抗滑支挡结构——三排阶梯形抗滑桩,以某填方边坡为例,采用有限差分法FLAC3D探讨了三排阶梯形抗滑桩的受力特征、支护效果以及岩土参数对抗滑桩受力特性的影响。研究表明:三排阶梯形抗滑桩各组成构件具有共同作用、协调变形,侧向刚度大、抵抗侧向变形能力强的特点,在边坡填方中,便于施工,能很好地抑制坡体变形;三排阶梯形抗滑桩工作时,在桩梁搭接处易产生拉应力集中,且后桩桩背受拉最强,中桩次之,前桩最弱,下部横梁易产生剪应力集中,且下梁受剪高于上梁;随着回填土内摩擦角的减小,抗滑桩各构件内力逐渐增大,且增加幅度越来越大;随着填土内摩擦角的增大,抗滑桩变形逐渐减小,且幅度越来越小。

In view of a new type of anti-slide retaining structure—three rows of stepped anti-sliding piles,based on a certain actual filling slope,the mechanical characteristics,supporting effects,and influence of geotechnical parameters on mechanical characteristics of three rows of stepped anti-slide piles were discussed by the finite difference software FLAC3D.The analysis results indicated that the members of stepped anti-slide piles were of the collaborative work,coordinated deformation,large lateral stiffness,strong resistance to lateral deformation and convenient construction during filling of slopes,which could better constrain the deformation of slopes.the tensile stress concentration was easy to occur at connections between piles and beams;the tension in the back of rear piles was largest and took the second place in intermediate piles,the tension in the front pile was smallest.The lower beam was prone to shear stress concentration,and the lower beam was sheared stronger than the upper beam;as the internal friction angle of the backfill decreased,the internal forces in each member of the anti-slide piles increased,and the growth rates were increasing.With the increase of the internal friction angle of fillers,the deformation of antislide piles gradually decreased,and the growth rates were decreasing.