竖向预应力锚索抗滑桩的优化研究

竖向预应力锚索抗滑桩是一种锚索从桩顶竖向穿过抗滑桩,直接嵌入基岩以下的新型抗滑桩。本文以某滑坡治理工程为例,采用数值模拟方法,研究竖向预应力锚索抗滑桩的内力,从桩长、锚固力、偏心距几个方面对竖向预应力锚索抗滑桩的桩身结构进行优化研究。模拟研究结果表明,其他条件不变时,竖向预应力锚索抗滑桩随着桩长的减小,桩身弯矩最大值变化不大,剪力最大值呈增大趋势; 随锚固力增加,桩身内力最大值均呈先减小后增大的趋势,表明选取合适的锚固力对桩身内力影响很大; 随着锚索偏心距的增大,桩身内力最大值均逐渐减小。优化结果表明,竖向预应力锚索抗滑桩锚固段比悬臂桩减少16.7%,桩身剪力最大值减少31.7%,桩身弯矩最大值减少41.1%。竖向预应力锚索抗滑桩是一种有应用前景的抗滑桩。

OPTIMAL DESIGN STUDY OF ANTI-SLIDE PILE WITH VERTICAL PRE-STRESSED ANCHOR

The anti-slide pile with vertical pre-stressed anchor is a type of pile that is passed through by vertical anchors from top to the bedrock.This paper is based on an engineering project. Numerical simulation method is used to study optimal design of the anti-slide pile with vertical pre-stressed anchor. Several aspects are considered and include the pile length, the anchoring force and eccentricity.The numerical results show that when other conditions are the same,the maximums of bending moment of the pile body with vertical pre-stressed anchor are changed little,but its maximums of shear force are increased as the pile length decreases. The maximums of the piles internal force are increased first and then decreased as the anchoring force increases. The maximums of the piles internal force are reduced gradually as the eccentricity increases.The optimization results show that the embedded part length of the anti-slide pile with vertical pre-stressed anchor is shorter 16.7% than that of the cantilever pile. Its maximums of shear force and bending moment are respectively 31.7% and 41.1% lower than those of the cantilever pile.Anti-slide pile with vertical pre-stressed anchor is a kind of promising anti-slide pile.