双排抗滑桩与门架抗滑桩的有限元分析对比

对于滑坡推力很大的大型滑坡,常可能需要采用两排或两排以上抗滑桩进行治理。为合理确定滑坡推力在各排桩上的分布形式或大小,计算各排桩的实际受力和变形,采用ABAQUS有限元软件,建立了双排抗滑桩和门架抗滑桩治理顺层滑坡的三维数值分析模型。通过在桩—土间设置库仑摩擦接触面模拟桩—土相互作用,用滑带岩土体强度折减方法来施加滑坡推力,探讨双排抗滑桩和门架抗滑桩的受力情况,对二者的位移、内力、桩身土压力分布进行了对比分析,研究结果表明,后者的位移、内力明显小于前者,说明门架抗滑桩受力更为合理,是更值得推广的抗滑支挡结构形式。

Finite element method comparison between double-row and portal anti-slide piles

Usually,two or more than two rows of anti-slide piles may be needed to stabilize large-scale landslides when the landslide thrusts are very large.In order to determine reasonably the distribution and magnitude of thrust forces applied to the piles and to calculate the actual deformation and internal forces of the piles,using the finite element software ABAQUS,two 3-dimension numerical models for stabilizing the bedding landslide by portal and double-row anti-slide piles were established separately.Considering the interaction between soil and pile by setting coulomb friction interface,the anti-slide piles were loaded through the strength reduction of the rock of the landslide zone,and the internal forces of the anti-slide piles were discussed.Comparing the displacements,internal forces and earth pressures of pile body of the piles,it was found that the displacement and internal force of the portal anti-slide pile are smaller than those of the double-row pile,which indicates the former has better mechanical behaviors.Therefore,as a retaining structural form,the portal anti-slide piles are worth to be promoted.