基坑工程中双排桩与三排桩的对比分析

Comparative Analysis of Double-Row Piles and Three-Row Piles in Foundation Pit Engineering

基于有限元法,对比分析了相同条件下基坑支护采用双排桩与三排桩的区别,计算表明采用三排桩进行基坑支护可减小土体与桩体的水平位移,三排桩的抗侧移刚度更大。采用三排桩后,桩体的轴力与弯矩减小,但剪力基本相同。三排桩虽然导致围护结构单项工程的造价增加,但可少用或不用内支撑缩短基坑工程总工期,其对最终造价的影响需综合测算。

Based on the finite element method, the difference between two rows of piles and three rows of piles is compared and analyzed under the same conditions. The calculation shows that the three rows of piles can greatly reduce the horizontal displacement of the soil and the pile body, and the three rows of piles have greater lateral displacement stiffness. Three-row piles reduce the axial force and bending moment of the pile, but the shear force is basically unchanged. Although the cost of the single project of the retaining structure has increased, the three-row piles can use less or no internal support, and shorten the total construction period of the foundation pit project. The impact of this method on the final cost needs to be comprehensively estimated.