预应力锚索抗滑桩结构优化

在对各种抗滑桩支挡结构的适用条件进行系统研究的基础上,进行传统锚索抗滑桩的结构优化。研究表明,在桩身弯矩峰值处加设锚索约束,可减小桩身弯矩。运用有限元计算方法进行单锚点预应力锚索抗滑桩的内力计算,按照"削峰填谷"的思路,在桩身弯矩峰值处加设第2个锚点,并在得到的二锚点预应力锚索抗滑桩的桩身弯矩峰值处加设第3个锚点,在此结构形式的基础上,上下移动第2和第3锚点位置,直至桩身弯矩峰值最小,找出最合理的锚点位置。在同等滑坡推力作用条件下,优化后的三锚点抗滑桩比普通抗滑桩节省工程造价33%,比单锚点抗滑桩节省10%。对于厚层大型滑坡,多锚点预应力锚索抗滑桩有着更好的推广和应用价值。

Optimization of Anti-Slide Pile with Prestressed Anchor Cable

Systematic study on the applicable conditions for various retaining structure of anti-slide piles has been carried out.On this basis,optimization has been conducted on the structure of traditional anti-slide pile with anchor cable.Research shows that adding anchor cable at the peak value point of the bending moment on the pile body can reduce the moment of pile body.By adopting FEM,the internal force is calculated for anti-slide pile of prestressed anchor cable with single-anchor point.By using the method of reducing the peak of the distribution of internal force and adding it to its lower part,the second anchor cable is added at the peak value point of the bending moment on the pile body.After obtaining the peak value of the pile body moment of the second anchor cable,the third anchor cable is added at the new peak value point of the bending moment on the anti-slide pile body with prestressed anchor cable.Based on this form of structure,the second and the third anchor cables are moved upwards and downwards to minimize the peak value of the pile body moment and find the most reasonable locations of anchor cables.Under the condition of same landslide propulsion action,the construction cost of the optimized anti-slide pile with three anchor cables is 33% less than that of ordinary anti-slide pile,and 10% less than that of anti-slide pile with single anchored cable.It proves that the anti-slide pile with prestressed multi-anchor-cable has better value for extensive application in large-scale thick landslide.