排桩加固支护边坡作用机理的有限元分析

Finite Element Method Analysis on Mechanical Behavior of the Reinforced Slope with Anti-Slide Piles

目的为了解决滑坡推力较大时,单排抗滑桩加固不能保证边坡的安全可靠,确定一种更加安全的边坡支护措施.方法采用强度折减的有限元法对某水电站厂房后边坡进行模拟,将得到的安全系数与极限平衡法所得安全系数进行对比,然后分别对采用单排抗滑桩和双排抗滑桩加固的边坡进行三维数值分析.结果计算表明,强度折减的有限元法分析此边坡是可行的,采用双排抗滑桩加固边坡比采用单排抗滑桩作用更加明显,在桩身位移,桩身弯矩最大值以及桩身的剪力方面,双排抗滑桩都不同程度的小于单排抗滑桩.结论在保证边坡抗滑桩加固工程的安全可靠性的前提下,可以使用单排桩加固的支护措施,当边坡推力较大时,需采用双排抗滑桩,可以大大降低工程成本,提高经济效益.

It is well known that when the landslide thrust of the slope is large, the single-row of an- ti-slide piles cannot ensure the safe reliability of the slope. In order to solve this problem, a kind of safer slope support measures was put forward in this article. Taking the back-slope of a hydropower house as an example, using the shear strength reduction finite element method to simulate its me- chanical behavior, comparing the obtained safety factors with the results by the limit equilibrium a- nalysis method,three-dimensional numerical analyses on the reinforced slope with the single-row and the double-row of anti-slide piles were carded out. It is found that using the double-row of an- ti-slide piles in slope reinforcement can get better performance than the single-row of anti-slide piles. Measured bending moments, displacements and shear stresses for the double-row of anti-slidepiles are less than the single-row with different levels. Conclusion is that the shear strength reduc- tion finite element method for slope analysis is feasible. Under the condition of satisfying the safe reliability of slope reinforcement engineering, the single-row of anti-slide piles can be used. When the landslide thrust of the slope is large, the double-row of anti-slide piles should be used for safety and reducing costs.