抗滑桩的优化分析

The optimization design for anti-slide piles

大截面的抗滑桩具有复杂的受力特性,建立了有限元模型,分析了采用单排和双排抗滑桩支挡后的稳定系数和破坏模式,对于单排抗滑桩,以支挡后的稳定系数为目标,确定了边坡的最佳设桩位置和最佳桩顶下沉高度;对于双排桩,两排桩上的推力总和要大于只设前排桩时的推力;当排距较小时,滑坡推力几乎全由后排桩承担,由于后排桩的遮蔽作用,前排桩达不到最佳抗滑效果,随着排距增加,前排桩分担的推力逐渐增加,当达到一定排距后,两排桩完全独立工作,各自承担一部分滑体推力,前后两排桩均达到最佳抗滑效果;并在推力分担、支挡后安全系数的计算基础上,提出了以两排桩的推力和、稳定系数和两排桩承担的推力差为目标,建立了用于双排抗滑桩的多目标优化,优选出了具有多种属性的双排抗滑桩的排距和推力分担。

The structure of two-row anti-slide piles was a complex mechanical characteristics.A finite element models were established and the stability factor and the failure mode for slope with one-row or two-row piles were discussed.About the slope with one-row piles,the project of the safety factor was selected,then the best location of pile and the best sinking distance of the pile top were stabled.About the slope with two-row piles,the total thrust of the two-row piles was bigger than the thrust of only the front row piles.While the row distance was small,the back row pile shared almost all the thrust,and with the masking function of the back row piles,the front row pile couldn＇t display the best effectiveness.When the pile row distance increased.The share ratio of piles in front row increased gradually.The two piles worked independently,resisted part sliding block respectively and displayed the best effectiveness at the particular row distance.Based on calculation of trust and safety factor for the slope of two-row anti-slide piles,the projects of the total trust,the safety factor and the reduce of two piles was selected and the multi-projects optimization for two-row anti-slide piles was put forward.The most reasonable row distance and share ratio of the thrust were attained.