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馬   迪

 

（ 陜西師范大學國有資產管理處 ，陜西 西安 710119)

摘   要 ：采用數值分析方法 ，研究堆載對鄰近橋梁樁基內力與變形的影響。使用耦合歐拉－拉格朗日法建立了堆載作用下某特大654#橋墩樁基三維有限元模型， 以橋墩軌道頂面橫向位移實測值與計算值對比驗證了模型的有效性。據此模型計算結果分析了鄰近大量堆土情況下樁基的內力和變形特性：各樁水平位移都在 1 /2L 附近的淤泥質粉質黏土層達到最大值；各樁1 /6L ~ 2/3L 范圍內樁身產生附加彎矩的最大值為210 kN · m;  且在 距堆載較近的樁基上部引起了負摩擦力，進而產生了581 ~ 1368 kN 的附加軸力。結果表明堆載嚴重劣化了樁基 的工作性能。可為主動防控堆載引發的墩臺偏移等病害研究提供一種可行的方法。

關鍵詞：堆載 ；橋梁樁基 ；CEL;  數值分析 ；內力 ；變形

中圖分類號：TU473 . 1             

文獻標志碼：A           

文章編號： 1005- 8249   (2024)  05- 0059- 06

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.05 .011

 

MA Di

(State Owned Assets Management Department ,   Shaanxi Normal University ,   Xi ’an 710119 ,   China)

Abstract: In this paper, the influence of pile load on the internal force and deformation of adjacent bridge pile foundation is studied by numerical analysis. The CEL method was used to establish a three-dimensional finite element model of the pile foundation of a bridge. The validity of the model is verified by comparing the measured and calculated transverse displacement of the track top surface. Based on the calculation results of the model, the internal force and deformation characteristics of pile foundation near a large number of piles are analyzed: Each pile’s maximum horizontal displacement appears at 1/2L of the pile body. In the range of 1/6L~2/3L of each pile, a large additional bending moment was generated. The upper part of the pile closer to the surcharge has a negative frictional force, which in turn produces an additional axial force of 581kN~1368kN. It is obvious that the surcharging load seriously deteriorates the pile foundation. It can provide a feasible method for active prevention and control of pier deflections caused by surcharge load.

Keywords: surcharge loading; bridge pile foundation; CEL；numerical analysis; internal force; deformation

  

作者簡介： 馬    迪  (1993—) , 男，碩士，工程師，研究方

向：巖土工程。

收稿日期：2023- 03- 20