品字型抗滑桩对滑坡的加固效果研究

Research on Reinforcement Effect on Landslide with Triangle Anti-slide Piles

利用FLAC3d程序对以组为单位进行设计的品字型抗滑桩对于滑坡的加固效果进行研究。其中,品字型抗滑桩分为无、有桩顶连梁两种形式。通过模拟计算,对在布置无、有桩顶连梁的品字型抗滑桩时,坡体的安全系数,桩的侧向位移、弯矩、剪力进行对比分析。通过对比得出:桩顶有连梁时,坡体的安全系数明显增加;桩的侧向位移明显减少,且一组中各桩的位移基本一致;桩顶弯矩明显增大,且滑动面以上各桩弯矩分布相对均匀,滑动面以下各桩弯矩相对有所减小;桩顶剪力均有所增加,滑动面以上,前排桩剪力峰值减小,后排桩剪力峰值增大,各桩的剪力幅度比较均匀。再通过将布置桩顶有连梁品字型抗滑桩与前后排相对应的无连梁双排抗滑桩进行对比,得出前者坡体的安全系数大,桩的侧向位移小,且节约材料,进一步验证了其优越性。因此,在抗滑桩结构形式设计中,桩顶有连梁品字型抗滑桩是更值得推广的结构形式。

By using the FLAC^3d program,the reinforcement effect on landslide with triangle anti-slide piles which designed by the unit of group is researched.The triangle anti-slide piles can be divided into two forms by whether having the tie beams.By simulate calculation,in arrangement for triangle anti-slide piles on the slope,FOS of slope,side displacement of piles,bending moment and shear stress of piles are compared and analyzed.Results show that the FOS of slope increase obviously when there are beams between the piles; side displacement of each pile in a group is basically the same; The bending moment of pile top increases obviously,the distribution of the bending moments is relatively uniform above the sliding surface,and those below decrease relatively; the shear stress of each pile tip has increased,above the sliding surface the shear stress peak of the front row has decreased,the back row has increase,and the amplitude of each pile is uniform.Then compared with the common double rows,it can seen that,when layout the triangle anti-slide piles,the FOS of slope is bigger,the displacement is small,and they can save material to prove its superiority.Above all,the triangle anti-slide piles which have beams on its top is a structure form more worthy in the anti-slide piles design.