基于ABAQUS的某高填方边坡双排桩挡土墙结构有限元计算方法

Finite element calculation method based on ABAQUS for double row pile retaining wall structure of a high-fill slope

双排桩侧向刚度大、承载力高,适用于深基坑和高填方边坡,顶部和扶壁式挡墙结合,外形美观。但已有的研究成果和分析方法尚不能完全满足实际工程应用。本文基于ABAQUS有限元软件,介绍了某高填方永久边坡工程中双排桩+扶壁式挡土墙设计方案和计算分析方法,该方法全面考虑了土的实际应力状态、塑性变形、桩土相互作用、土压力实际分布状态等。将有限元计算结果与利用规范方法计算结果进行对比,结果表明:按现行规范计算的排桩内力结果偏小,冠梁和联系梁的内力计算结果偏大;由前后排桩轴力承担的整体弯矩较大,双排桩通过冠梁、联系梁形成整体刚架共同抵抗土压力。冠梁和联系梁是保证双排桩联合受力的关键。

Double row piles have large lateral stiffness and high bearing capacity,which are suitable for deep foundation pit and high-filled slopes.Combined with counterfort retaining wall,and the appearance is beautiful.However,the existing research results and analysis methods cannot fully meet the practical engineering applications.Based on the ABAQUS software,a design scheme and analysis of double row piles+counterfort retaining wall for a high-filled permanent slope project is introduced in this paper.The actual stress state,plastic deformation,pile-soil interaction,and actual distribution state of soil pressure of the soil are comprehensively considered in this method.The calculated results are compared with that calculated by the code method.The results show that the internal forces of piles calculated according to the current code are smaller,and the internal forces of crown beams and connecting beams are larger;(2)The overall bending moment borne by the axial force of the piles is large,and the double rows of piles form an integral rigid frame through the crown beam and connecting beam to jointly resist the earth pressure.The crown beam and connecting beam are the key to ensure the joint force of double row piles.