埋入式抗滑桩承担的滑坡推力分析

ANALYSIS OF LANDSLIDE THRUST ACTING ON EMBEDDED ANTI-SLIDE PILE

采用有限元强度折减法对埋入式抗滑桩加固的滑坡模型进行了数值分析。模拟结果表明,在设计工况下埋入式桩承担的滑坡推力与全长桩承担的滑坡推力相当,推力大小与设计安全系数有关。在极限破坏工况下,桩悬臂段越长,滑体越顶滑动破坏时对应的稳定安全系数也越大,桩承担的滑坡推力越大。由此提出埋入式抗滑桩加固滑坡设计时,埋入式桩的合理桩长可采用强度折减数值方法根据设计安全系数确定,埋入式桩应承担的滑坡推力可用传统极限平衡法按全长桩计算,也可用有限元强度折减法进行校核。

The finite element strength reduction method was used to analyze the landslide thrust acting on an embedded anti-slide pile.The results show that:the landslide thrust acting on an embedded pile is equivalent to the landslide thrust acting on a full-length pile,and the thrust is related to the design safety factor.Under the condition of ultimate failure,the longer the cantilever section of the pile,the greater the corresponding stability safety factor when the sliding body is sliding on the top of the pile,and the greater the landslide thrust acting on the pile.As a result,it is proposed that in the design of an embedded anti-slide pile to strengthen landslide,the reasonable length of the embedded pile can be determined by strength reduction numerical method according to the design safety factor.The landslide thrust borne by the embedded pile can be directly calculated by the finite element strength reduction method,or can be checked by the traditional limit equilibrium method according to the full-length of the pile.